Sensors and Controls S O L U T I O N S G U I D E Index Bourns Sensors and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Potentiometers Selecting a Potentiometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Modification Capabilities and Value-Added Solutions . . . . . . . . . . . . . . . . .9 Array of Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Precision Multiturn Potentiometers Encoders Selecting an Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Modification Capabilities and Value-Added Solutions . . . . . . . . . . . . . . . .17 Array of Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Custom Solutions Automotive Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Other Custom Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 Integrated Front Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Cursor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Application Notes Potentiometers Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 Typical Applications & Circuit Configurations . . . . . . . . . . . . . . . . . . . .30 Encoders Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 General Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 Application Information for EN Series Optical Encoder . . . . . . . . . . . . .36 Precision Single-Turn Potentiometers Panel Controls Commercial Controls Product Selection Guides Potentiometers Precision Multiturn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 Precision Single-Turn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47 Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51 Commercial Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61 Encoders Industrial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63 Commercial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64 Dials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66 Industrial Encoders Commercial Encoders Data Sheets (All data sheets can be accessed through the links in the Product Selection Guides section beginning on page 41.) Glossary of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67 Integrated Front Panels Dials 1 Introduction The Bourns Mission Our goal is to satisfy customers on a global basis while achieving sound growth with technological products of innovative design, superior quality and exceptional value. We commit ourselves to excellence, to the continuous improvement of our people, technologies, systems, products and services, to industry leadership and to the highest level of integrity. Bourns Corporate Bourns, Inc. has been providing reliable and innovative solutions to the electronics industry for over 50 years. With manufacturing facilities and customer support teams located throughout the world, Bourns is uniquely positioned to serve the industrial, automotive, telecommunications, audio/visual, aerospace and other electronic industries. Most importantly, Bourns is firmly committed to quality, service and innovation. Sensors and Controls Headquarters The Sensors and Controls Division is headquartered in Riverside, California. Since introducing its precision control line in 1970, Sensors and Controls now manufactures an extensive range of products. The product lines include Precision Controls, Panel Controls, Commercial Controls, Encoders, Turns Counting Dials, and a wide array of Custom Solutions for use in the industrial, medical, professional audio, consumer electronics and automotive industries. Bourns Corporate headquarters in Riverside, California World-Class Manufacturing The majority of Sensors and Controls products are manufactured at the Bourns facility, Bourns de Mexico-CLM (BCLM), located in Tijuana, Mexico. The 58,000 square foot facility employs over 500 people and has been recognized with various quality awards from Ford and Motorola among others. The facility is ISO/QS certified since 1997 and has certified several employees through the six-sigma "Black Belt" program. With the implementation of the Bourns Production System, many of the employees are now involved in Kaizen events to further improve production efficiencies and reduce cost. BCLM production line BCLM production facility 2 Our core competencies in plastic injection molding and thick film printing combined with world class manufacturing facilities have contributed to the success of Sensors and Controls over the years. Market research feeds the continuous development of new models to meet the changing application needs and state-of-the-art performance requirements of the electronics industry. Continuing advances in materials-research and processing techniques have enabled Bourns to provide innovative product solutions to a growing customer base on a continuous basis. Introduction Quick Response Center The "heart" of the Bourns Sensors and Controls operation located in Tijuana, Mexico, is the Quick Response Center (QRC). The QRC employs a technical base of engineers, technicians, and production personnel to process all customer inquiries and sample requests. Producing samples with modified features for application specific requirements in a relatively short time is the main focus of the QRC. By utilizing the sustaining engineering and fabrication departments, the QRC can modify parts produced to customer specifications and coordinate sample fabrication in production areas to insure the utmost quality and reliability. This process reduces cycle time and decreases response time to the customer. The QRC's mission is quick response to the design needs of our customers. Design Center Using state-of-the-art design software and applying practical solutions to complex applications, Sensors and Controls Design Engineers develop and design products for the changing needs of the electronics industry. Working side by side with the Quick Response Center (QRC), the engineering team reviews feasibility of customer requirements, Riverside Engineering Design Center documents all new and modified designs on existing products, and coordinates prototype fabrication with the manufacturing facility. Our engineers work closely with customers to design cost effective and reliable solutions. Whatever your product needs may be, Sensors and Controls engineers can support your requirements. BCLM Quick Response Center Team 3 Introduction Reliability Test Facility Once our engineering team has developed a product design, the Reliability Test Facility takes a major role to insure performance standards. The lab is equipped with specialized test equipment designed to run for thousands of hours, providing environmental, electrical and mechanical testing of potentiometers and encoders. Humidity, salt spray, rotational cycling, and exposure to high and low temperature extremes are just a few of the specialized tests performed on our products. In addition to testing finished products, our lab is set up to test individual piece parts, such as printed elements and windings, for endurance. The Reliability Assurance Test Program (RATP), which has a six-sigma quality goal, is evidence of our commitment to quality. Commitment to Quality Quality is the foundation of our products, starting with the acceptance of the customer drawing. Quality is continually being measured each and every time a Bourns(R) product is being put to use in every customer application. The Sensors and Controls Division has adopted the Six-Sigma Quality Program as the foundation of our business practice. Quality goes far beyond perfect parts, beyond quality control, to understanding zero-defects and how dependability affects our customer's customer. We are QS9000 certified and committed to consistent product reliability, assuring the highest yield of dependable, high performance products. Bourns' successful commitment to quality is evident from the awards that the company has been received over the years. Some of the most recent awards include: * 2002 - Invensys Bronze Supplier Award * 2002 - Tektronix Preferred Supplier Award * 2000 - Lucent APL Gold Award * 2000 - TTI Supplier Excellence Award Riverside Reliability Test Facility 4 Introduction Technical Support Trained sales representatives, account managers and distributor sales engineers are located conveniently around the world. Our Field Application Engineers (FAEs) are also strategically located to assist with technical support and to provide an interface between customer inquiries and our production facility. Our technical support team can provide you with solutions appropriately selected and precisely manufactured to satisfy your requirements for performance, cost and availability. Customer Service Bourns' distributor network is the most extensive in the industry. Our three Bourns Customer Service Centers located in the US, Europe and Asia, as well as our extensive distributor network, are dedicated to serve you on any aspect and demand. With 100 % on-time delivery and world-class service as core business objectives, we ensure direct support for customers in all countries and market segments. At Sensors and Controls Division, we strive to build good business relationships with our customers. In every aspect from innovative designs to on-time delivery, Bourns Sensors and Controls is the first choice in the industry for reliable and cost-effective potentiometers, encoders and custom solutions. 5 Potentiometers Selecting a Potentiometer The Sensors and Controls Division has a potentiometer to fit many of your applications. Whether you need a precision control with millions of rotational life cycles or a commercial potentiometer that fits in a hand-held radio, we have a product selection that is second to none. No other manufacturer offers a broader selection of potentiometers than Bourns Sensors and Controls. Types of potentiometers in the Sensors and Controls product line include: * Multiturn Precision * Single-Turn Precision * Panel Control * Commercial Grade Precision Potentiometers are used to provide an accurate electrical output signal corresponding to a mechanical position input, where accuracy, reliability and long life are important. These devices are generally designed for high reliability, long life in continuous service, high accuracy and operation in demanding environments. Panel Control Potentiometers are used where the frequency of adjustment is high and front panel accessibility is required. These industrial grade devices are designed for long rotational life with emphasis on good adjustability. Commercial Potentiometers are used in consumer applications as lower cost alternatives to industrial grade panel controls. These devices are designed for moderate rotational life with emphasis on low cost. In selecting a potentiometer for your application, the most important characteristics to consider are the type of element (cermet, conductive plastic, carbon, wirewound and Hybritron(R)) and expected cycle life of the product. Cermet Element Technology Cermet elements are available in a wide range of resistance values and tapers. They offer essentially infinite resolution and excellent stability in the most severe environmental conditions. Static and dynamic noise (CRV) performance is good, although conductive plastic is better. The temperature coefficient of cermet elements is better than conductive plastic or carbon type elements, though not as good as wirewound elements. Linearity is good but can be improved in accuracy by utilizing laser-trimming technology. Frequency response of cermet materials is very good. The practical application range extends well beyond 100 MHz. Conductive Plastic Element Technology Conductive plastic thick film ink is similar to cermet, but has a smoother surface. This characteristic offers several operational advantages over cermet. Dynamic noise characteristics (CRV or output smoothness) and rotational life are measurably improved and resolution is essentially infinite. Conductive plastic elements are generally available in a wide range of resistance values and tapers. Moisture resistance, temperature coefficient, power dissipation and wiper current capacity for conductive plastic elements are not as good as cermet elements. Carbon Element Technology Carbon elements offer the most costeffective technology. A carbon-based resistive ink is screened or sprayed onto a phenolic or FR4 substrate. Resistance ranges are limited, beginning with 1 k and going as high as 1 M. Potentiometers using this element technology are typically for commercial type applications, with rotational life in the 10,000 to 15,000 cycles range. 7 Potentiometers Wirewound Element Technology Wirewound elements offer good stability, excellent linearity, low noise, high power capabilities and good operational life. Wirewound elements offer a wide range of resistance values up to 500 k. One primary limitation of wirewound elements is the finite resolution steps, which result from the wiper moving from turn to turn perpendicular to the coil of wire. (These steps are distinct, sudden, repeatable changes in output.) Resolution improves as resistance values increase due to the manufacturing processes whereby smaller diameter wire and a higher number of turns are utilized. For applications that may be sensitive to such discrete steps, care should be taken to select an element with resolution fine enough to avoid difficulty. The coil of resistance wire used to fabricate a wirewound element exhibits an inductive reactance that increases proportionately with the frequency. This effect is most noticeable in the lower total resistance elements where the inductive reactance can be larger than the resistance, even at frequencies as low as 20 kHz. The performance of wirewound elements is also affected by inherent capacitance. Capacitance exists from turn to turn and also between the winding and the mandrel. The effects of capacitance are most significant in the higher total resistance elements. Hybritron(R) Element Technology This element is a wirewound element with a conductive plastic coating. It exhibits the temperature coefficient and resistance stability similar to a pure wirewound element. In addition, it displays the long operational life, essentially infinite resolution and low noise characteristics of the pure conductive plastic elements. The combination of the two provides the major benefits of both types of elements. This element is not recommended in applications requiring high wiper currents. 8 Mechanical Cycle Life Mechanical cycle life is the ability of a potentiometer to withstand a specified number of cycles under specific operating conditions, while remaining within allowable specifications. A mechanical cycle consists of wiper traverse from one limit of travel to the other limit, and back. The performance is determined by the type of resistive element and wiper used in the construction of the potentiometer. Precision Potentiometers are generally capable of mechanical cycle life in the range of 300,000 to 25,000,000 shaft revolutions. Panel Control Potentiometers are generally capable of mechanical cycle life in the range of 25,000 to 100,000 full cycles. Commercial Potentiometers are generally capable of mechanical cycle life in the range of 10,000 to 25,000 full cycles. The actual mechanical cycle life or rotational life will heavily depend on the environmental and electrical stresses imposed on the unit during its life. Additional information on performance characteristics and applications is contained in the "Application Notes" section of this guide. Potentiometers Modification Capabilities and Value-Added Solutions The strength of Bourns Sensors and Controls product line lies in the customized or modified potentiometers to suit your application. A wide range of "value-added" potentiometer enhancements is also available to provide you with cost-effective solutions. We appreciate the opportunity to explore your application and provide potentiometers modified to meet your exact needs. Bourns' capabilities to develop custom potentiometer solutions and modifications include the following: Terminal Configurations Terminals can be customized. Hardware Most products are shipped with one hex nut and one lock washer, with other configurations available on request. Bushing and Servo Mount Bushings can be modified to add a flat, provide special thread pitch, or even custom lengths. Servo mount versions can be substituted on many bushing mount models. Seal Many models are sealed for board processing. Some models can be sealed to IP65 specifications. Marking Standard marking includes the Bourns part number and date code. We can mark additional information, such as customer name and part number, or any other designations. Special Packaging Bourns will provide custom packaging to meet your production or storage needs. Customized Shaft Options In all shaft diameters, Bourns can modify the length of the shaft, add a flat with special shaft orientation, add holes or notches, or even press on a gear as a value-added option. Mounting Brackets Bourns can develop a customized bracket. Servo mount precision controls can use motor mount cleats or precision synchro mounting clamps by Pic Design. (www.pic-design.com) Some additional customizing features solely applicable to potentiometers: Switches Rotary switches are available as a standard feature on many panel control models. Push switches can be added to meet your specific needs. Special Test Requirements Bourns has the capability to provide extensive reliability testing as required. We can accommodate most special test needs along with test documentation and/or certification with each shipment as requested. Cable Harness or Lead Wires For ease of connection to your application, we can supply a custom fit cable harness or lead wires with a mating connector. 9 Potentiometers Special Tapers We can provide custom tapers on our nonwirewound panel controls and precision potentiometers. Front and Rear Ball Bearings Bourns offers additional ball bearing configurations not listed in our data sheets to accommodate unique applications with heavy shaft side load. This option is typically used with our 65xx and 66xx singleturn precision controls. Independent Linearity Our wirewound and single-turn precision potentiometers can be ordered with special linearity from 0.1 % to 2.0 %. Temperature Ratings Bourns offers special potentiometer configurations made to withstand temperature extremes. Center Tap We can add a fourth terminal (center tap) for measuring current or voltage. High Torque Running torque variations available in 2 to 8 oz-in for a smooth, heavy feel. Dual Wipers Our precision controls 65xx and 66xx models can be produced with dual resistive tracks and dual wipers. 10 Rear Shaft Extension This option is available on many models, and is most popular on a multiturn wirewound potentiometer, but is available on panel control models as well. Mechanical & Electrical Angles We can provide custom mechanical and electrical angles. Electrical angles are typically smaller than their corresponding mechanical angles. Multi-Section Potentiometers This feature is available on many panel control and precision potentiometer models. These devices can be configured with one shaft to control multiple ganged potentiometers, or a dual concentric shaft for individual adjustment. Potentiometers Array of Applications Bourns(R) potentiometers can be found in a broad array of applications and functions. For over 50 years, Bourns has provided technical leadership in the potentiometer market. Our engineering and design expertise have provided customers solutions to applications in the following areas: Medical State-of-the-art medical equipment requires a reliable electronic solution that will withstand the use and abuse of daily wear. Bourns(R) potentiometers, used as human interface controls, or sensors in non-critical life support applications are designed to outlast the equipment life. Transportation A fast growing marketplace, manufacturers are taking advantage of long life precision potentiometers used as position feedback sensors in rugged transportation systems. * Aircraft Systems * Rocket Guidance Systems * Agriculture & Construction Equipment * Traffic Control Systems * Training & Simulation Equipment * Locomotive Braking Systems * Forklifts * Joystick Controls * Automotive Comfort Controls * Motorized Golf Carts * Dental Equipment * Electric Wheelchairs * Analytical & Diagnostic Equipment * Hospital Bed Controls * Positioning Controls for X-Ray 11 Potentiometers 12 Industrial Controls Bourns(R) precision potentiometers have played a key role in industrial control systems for many years. Dependable and accurate, Bourns(R) potentiometers should be your first choice for your most robust and Professional Audio As a leader serving the professional audio market, Bourns(R) controls are used for volume, balance, and demanding applications. * HVAC Equipment * Illumination and Theater Controls * Meteorological Equipment * Oil Exploration & Refinery Equipment * Manufacturing Control Systems * Machine Tool/Presses/Vision Systems * Robots/Robotic Equipment * Dispensing Process Equipment * Controls for Printing Presses * Food Processing Equipment * Automatic Doors/Gates * Automated Warehouse Equipment * Speed/Adjustment Controls tone controls in professional audio equipment today. * Studio Recording Equipment * Mixing Consoles * Broadcast Equipment * Keyboards * Amplifiers * Commercial Audio Sound Systems Instrumentation On a panel in selector mode, or inside the cabinet as a sensor, Bourns'(R) potentiometers are an excellent choice for all types of instrumentation. * Oscilloscopes * X-Y Plotters * Fluid Level Sensors * Aircraft Lighting Systems * Helicopter Communication Systems * Test & Measurement Equipment Potentiometers Commercial Appliances Bourns has developed many controls for the expanding electronic appliance industry. We can modify any of our potentiometers to meet these robust commercial applications. * Laundry * Refrigeration * Oven Ranges * Hand Mixers * Food Processors To assist you in making the right potentiometer selection for your application, please refer to the sections in this guide entitled "Application Notes" and "Product Selection Guides." These sections provide a side-by-side comparison of specifications for each model along with technical data for each model. Additional technical information can be found in the "Data Sheets" and "Glossary of Terms" sections. Consumer Electronics Bourns(R) potentiometers continue to get smaller as the demand for portable equipment increases. Take a look at all the models we have to offer for this growing consumer electronics industry. * Computer Speakers * Car Audio * Dictation Equipment * Film Development Processors * Graphic Applications & Simulation * Joy Sticks 13 Encoders Selecting an Encoder With Sensors and Controls offering more than 10 different models of encoders, we have one to fit your applications needs. Providing the industry with both contacting and non-contacting encoders, Bourns is recognized worldwide for supplying standard and custom encoder solutions and providing excellent technical support. An encoder is a rotary or linear device that detects or senses a change in position resulting in a digital signal output. These devices are also known as Incremental Encoders, Digital Panel Controls, Bit Switches, Gray Code Switches and Digital Switches. Rotary encoders are physically similar in appearance to a potentiometer. However, the electrical function of an encoder is different than a potentiometer. Encoders are used in applications from car radios to automatic door openers as position sensing digital switches. Some of the functions that the Bourns(R) encoders can be used for are: * Identifying direction of rotation * Detecting angular position * Up/down counting * Sensing speed of rotation * Pulse generation * Switching An advantage of using encoders over potentiometers in a digital circuit is that the signal produced by an encoder eliminates the analog-to-digital (A/D) conversion process. This approach can reduce memory overhead, wiring and wiring interconnects, and can provide greater MPU program speed. Important Characteristics In selecting an encoder for your application, the most important characteristics to consider are the type of technology, type of output signal, speed of rotation, expected cycle life and switching capability of the product. There are two basic technology classifications of encoders: contacting (mechanical) and non-contacting. Your application will dictate the type of technology that will be best suited for your design. Contacting Technology Contacting encoders have two major components in their construction: the coded element and a contacting sensor or wiper. Movement of the wiper over a coded element emulates a mechanical switching action, producing a digital output signal. This type of technology offers the most cost-effective solution for your application. However, resolution and rotational life are limitations of contacting designs. Bourns offers a variety of contacting encoder models suited for low cost applications. Non-Contacting Technology Non-contacting encoders can be constructed from four different types of technologies: optical, inductive, capacitive and magnetic. Optical encoders contain three major components in their construction: a light source, a code disk, and a detector. Resolution and life are much higher than the contacting technology. Optical encoders can be used in both static and dynamic applications. This type of encoder offers a midrange priced solution for your application. Magnetic encoders contain three major components in their construction: a coil, a magnet, and a sensor. Magnetic encoders can operate in very high-speed and high temperature applications. However, resolution is limited for an equivalent sized optical encoder package. This type of encoder is used in dynamic applications only and is a high priced component. Bourns offers optical encoders suitable for your applications. 15 Encoders Types of Output Signals There are two basic types of encoder output signals: incremental and absolute. The incremental signal consists of two phase-shifted, square-wave signals. The phase shift is required for recognition of the direction of rotation. The absolute signal, also known as Gray Code, consists of discreet coded binary values and may be from 4 to 16 bits wide. In application, absolute encoders are required if a particular setting must be recognized and available after a power down of the system. All other applications can use an incremental encoder. Speed of Rotation Contacting encoders have a higher sensitivity to speed of rotation or revolutions per minute (RPM). On the other hand, non-contacting encoders can be rotated at high speeds. Most contacting encoders begin to skip counts when the shaft is rotated in excess of 100 RPM, while noncontacting encoders fitted with ball bearings can be rotated at speeds up to 3000 RPM. Rotational Life Contacting encoders have a limited rotational life due to wear on mechanical contact components used to create the signal output. In general, contacting encoders have a rotational life below 100,000 cycles. On the other hand, non-contacting encoders can endure rotational life in excess of 1,000,000 cycles. Non-contacting encoders are theoretically limited by the wear in bearing surface of the bushing or ball bearings holding the shaft in place. Typical cycle life expectancy is 10 million without ball bearings and 200 million with ball bearings. 16 Switching Capability Encoders are frequently used in switching applications where each discreet binary number in the output signal is recognized as a specific instruction or setting for the digital system. In such cases, the system must recognize the position of the encoder after power down of the system. For those applications, encoders such as Bourns(R) Model EA Absolute Contacting Encoder (ACETM) are the perfect solution. Incremental contacting encoders can also be used in such applications. However, the designer must make additional software and hardware provisions for retaining the encoder position in a non-volatile memory. Another frequently used option available in many encoder models is the momentary push switch. This type of switch is typically used to drive menu selection in a digital display. Bourns offers the model EP and PEC series encoders with momentary push switch options to suit your application. Additional information on performance characteristics and applications is contained in the "Application Notes" section of this guide. Encoders Modification Capabilities and Value-Added Solutions The Sensors and Controls Division has continued to expand its encoder product offering with a wide variety of models to meet your application needs, including both absolute and incremental quadrature output codes. A wide range of "value-added" potentiometer enhancements is also available to provide you with cost-effective solutions. We would like the opportunity to provide a custom solution to meet your application and design needs. Bourns' capabilities to develop custom encoder solutions and modifications include the following: Cable Harness/Lead Wires For ease of connection to your application, we can supply a custom fit cable harness or lead wires. We can even supply it with a mating connector. Detents On some models, the detent count can be doubled or quadrupled per electrical output cycle. Custom Output In addition to our standard electrical output (PPR), custom outputs signals can be developed to meet special application needs. Seal Some models are sealed for board processing. Some models can be sealed to IP65 specifications. Torque On some models, rotational torque can be increased for a smooth, heavier feel. Special Packaging Bourns can provide custom packaging to meet your production or storage needs. Terminal Configurations Terminals can be formed to meet your application needs. Hardware Most products are shipped with one hex nut and one lock washer, but other configurations are available upon request. Marking Standard marking includes the Bourns part number and date code. We can mark additional information, such as customer name and part number, or any other designations. Mechanical Stops All encoders are continuous turn, but stops can be added to limit mechanical travel. Mounting Brackets Bourns can develop a customized bracket to meet your needs. Servo mount precision controls can use motor mount cleats or precision synchro mounting clamps by Pic Design. (www.pic-design.com) Special Test Requirements We have the capability to provide extensive reliability testing as required. We can accommodate most special test needs along with test documentation and/or certification with each shipment as requested. Customized Shaft Options In all shaft diameters, Bourns has the ability to modify the length of the shaft, add a flat with special shaft orientation, add holes or notches, or even press on a gear as a value-added option. 17 Encoders Array of Applications Bourns Sensors and Controls offers a wide range of encoder package options and performance characteristics unmatched by competitive devices. This extra measure of adaptability makes Bourns(R) encoders the optimum solution for a broad range of applications. Our engineering and design expertise used to resolve customer needs have led us to encoder applications in the following industries: Test & Measurement Equipment Used as input devices for all types of test and measurement equipment, contacting and optical encoders provide accurate adjustment controls insuring reliability and dependability in your end product. Professional and Consumer Audio An industry leader serving the professional and consumer audio market, Bourns' contacting and optical encoders can be found in all types of audio applications. Old analog designs are being redesigned with to digital circuits with encoders replacing potentiometers. * Oscilloscopes * Digital Analyzers * Measurement Instruments * Weather Instruments * Medical Diagnostic Equipment * Chart Recorders * Digital Monitors * Studio Recording Equipment * Digital Mixing Consoles * Digital Broadcast Equipment * Professional Sound Systems * Digital Amplifiers * Digital Car Audio 18 Encoders Industrial/Factory Automation Optical Encoders are a rugged and durable solution for factory automation and industrial uses. With millions of life cycles, non-contacting technology enables these encoders to outlast the life of the equipment. Designed with outputs to 256 pulses per revolution, Bourns(R) optical encoders provide the highest resolution with the smallest package size in the industry. * Robotics * Material Handling * Forklift Trucks * Machine Tools * Automated Gates/Doors * Fluid Measurement To assist you in making the right encoder selection for your application, please refer to the sections in this guide entitled "Application Notes" and "Product Selection Guides." These sections provide a side-byside comparison of specifications for each model along with technical data for each model. Additional technical information can be found in the "Data Sheets" and "Glossary of Terms" sections. 19 Custom Solutions Automotive Products Many of the world's leading manufacturers have long known Bourns as a company that they can trust to deliver quality electronic parts on time and within tartargget costs. With components and inteintegrated solutions for many automotive appapplications, Bourns Sensors and Controls has a keen sense of automotive companies' needs. Our products deliver performance and reliability you can trust. Bourns has been an integral part of many recent technological advances providing high-performance, low-cost, magnetic position sensors, and enhancements to positive temperature coefficient over-current protection devices. At the Sensors and Controls Division, we understand that automotive manufacturers need complete solutions. To achieve an optimum blend of price and quality, we are structured to be one of the world's most vertically integrated suppliers. With our own prototype engineering labs and tool rooms, we are able to minimize the time to market. From simple substrates to complete assemblies, Bourns does it all. Our component offering is exceptionally broad-based. Bourns automotive offerings include sensors, overcurrent protection devices, controls, and discrete components. The breadth of Bourns standard product offering is unmatched in the passive electronics industry. At the same time, our vertical integration, production capacity, and technical expertise gives us the ability to adapt quickly to just about any custom requirement. This unbeatable versatility continues to make Bourns a supplier of choice for many automotive manufacturers. Simply contact your local Bourns sales representative for assistance on your automotive needs. Bourns Automotive Engineering Group has designed, prototyped, and manufactured customized automotive sensors for tier one and tier two automotive customers over the last 25 years. With everything from contacting type encoders for automobile radios, including the more recent use of new non-contacting magnetic technology in throttle position sensors and electronic throttle control applications, Bourns can provide you with the custom discreet and integrated solutions needed in today's changing automotive marketplace. 21 Custom Solutions Bourns core technologies can be tailored to fit any sensor application. These technologies include: * Thick Film Printing * Long Life Resistive Ink Technology * Non-Contacting Magnetic Technology * Insert and Injection Molding * CNC Machining * Metal Fabrication Bourns Automotive Engineering Group has been successful in developing the following types of components for the automotive industry: * Brake Wear Sensors * Steering System Sensors * Gear Position Sensors * Single/Dual Output Non-Contacting Pedal Position Sensors * Non-Contacting Linear and Rotary EGR Sensors * Non-Contacting Rotary Throttle Position Sensors * Electronic Transmission Sensors * Suspension Position Sensors * Memory Seat Controls * Radio Controls * HVAC 22 Whatever your automotive sensor or control requirement may be, Bourns Automotive Engineering Group has the expertise to design, prototype, and manufacture it for you. Simply contact your local Bourns Sales Representative with details of your idea or design, and they will do the rest. Like millions before you, Bourns will be happy to provide you with the most Reliable Electronic Solutions the industry has to offer. Custom Solutions Custom Solutions for Automotive Applications Dimming System * 3310 Panel Control Stability Systems * Suspension Sensors * Steering Sensors * Brake Wear Sensors Cockpit Systems * HVAC Controls * Radio Controls * Integrated Electronic Front Panel Solutions * Infotainment Electronic Solutions Engine Management Systems * Throttle Position Sensors * Pedal Position Sensors * EGR Valve Position Sensors * Transmission/Gear Position Sensors 23 Custom Solutions Other Custom Products The Sensors and Controls Division specializes in designing, developing and manufacturing custom components, utilizing both contacting and noncontacting technologies. From throttle position sensors for a unique automotive environment, to printed circuit boards custom fitted with Bourns(R) contacting encoders, we aid customers in developing their ideas into assembly ready solutions. Bourns can fully integrate passive and active components into an array of housing sizes to meet customer needs. One example of a custom solution is the Bourns(R) Smart Panel Control. This device is a digital rotary control with embedded functionality facilitated by on-board electronics. The product may be programmed to accommodate a variety of different functions. Specifically, it can control several devices and all associated functions through one simple, intelligent interface. Another Smart Panel Control configuration directly controls and powers a small DC motor for an automotive or industrial application. Variables such as speed, slew rate and control curve can be programmed into the on board electronics. The Smart Panel Control may also monitor all systems and under program control either notify the operator of the offending condition, or take direct action. With Bourns' core manufacturing competencies in precision injection molding, metal fabrication, resistive ink development and high volume resistive ink printing, we can cost-effectively meet your application needs. Simply contact your local Bourns Sales Representative to start the process. Bourns Advantage Competitor Bourns Quote and Purchase PCB Fabrication Place one purchase order for a Bourns Integrated PCB System and you'll have time to concentrate on what is important: your final product Quote and Purchase PCB Components Quote and Purchase Discrete Encoder Potential Delivery Issues Stock Discrete Encoder Test Discrete Encoder Assemble and Solder Discrete Encoder Test Final PCB Assembly Install into Final Product Diagram1: The Bourns Advantage 24 Custom Solutions Integrated Front Panels An Integrated Front Panel (IFP) is a custom solution designed by the Sensors and Controls Engineering Group where a printed circuit board is populated with encoders and additional components providing the customer with a cost-effective solution. "Integrated" refers to Bourns(R) contacting encoders integrated directly onto the board, using the board surface as the encoder element through a patented process. Previous applications have included between 7 and 11 contacting encoders on a surface mount technology (SMT) or a throughhole printed circuit board. An advantage of this technology is the opportunity to upgrade to SMT versus a through-hole design. IFPs can be designed with either front mounted encoders or rear mounted encoders allowing for extra space to accommodate additional components. This design versatility allows for higher component density, freeing up valuable board real estate. IFP systems provide a simplified, cost-effective "plug and play" solutions for our customers. The IFP System Advantage The Engineering Group at the Sensors and Controls Division has developed a cost-effective and time saving custom solution for you. IFP provides you with a total solution: integrating the encoders directly to your printed circuit board, populating the board with additional components, testing the final product, and delivering the total package to you. The IFP System gives you an advantage over your competitor by allowing you to place one purchase order and receive one shipment. All you do is plug it into your system and turn it on. (See Diagram 1 on page 24.) Partnerships with our Customers As part of a joint effort to solve a customer assembly problem, Bourns designed and developed custom integrated encoders that mount directly onto the customer's printed circuit board. This process and technology are now available for all customers. Available in three versions, front mount, front mount with push momentary switch, and rear mount, Bourns can efficiently reconfigure your current printed circuit board from a through-hole design to a surface mount version and integrate encoders as part of the circuit board. This custom encoder solution provides long operating life, consistent feel, and space saving benefits. Produced in ISO certified manufacturing facilities, Bourns provides full turnkey service with procurement and total assembly of all your discrete electronic components, along with our integrated encoders. We ship a fully tested and assembled unit, truly a plug and play solution. Additional information can be found in the section entitled "Data Sheets." If you currently use three or more encoders on your panel design, we can customize an IFP to your specifications. Contact your local Bourns Sales Representative today. Cursor Control A Cursor Control is a solid, ceramic two-axis or three-axis force sensor based on a thick film technology innovation. This revolutionary design provides a distinct linear output in all three axes, resulting in smooth motion control. The compact size is ideally suited for applications where space is a major constraint. This family of sensors addresses emerging customer needs for long life and reliability with a very attractively priced product offering. NOTE: Cursor Control products, previously offered by Bourns, are now available through Synaptics Inc., San Jose, CA. For additional information, please visit their website at www.synaptics.com. 25 A P P L I C AT I O N N O T E S 26 Application Notes Potentiometers rating indicates to the circuit designer how much power may be safely dissipated without harm to the device. Performance Characteristics The following section discusses various performance characteristics to be considered when selecting a potentiometer along with typical applications and basic circuit configurations. Power Rating Power rating is the maximum heat that can be dissipated by a potentiometer under specified conditions with certain performance requirements. Heat (or power) dissipation is the result of current passing through a resistance. The useful life of a given potentiometer is directly related to the maximum temperature allowed in the interior of the unit. Above a certain internal temperature, insulating materials begin to degrade. A maximum power Models 39 50 Series 80 Series (81, 82, 85, 86) 80 Series (83, 84) 90 Series 3310 3851, 3852, 3856 3862 PCW PDA17 PDB12 PDB18 PTV09 PTV111/PTT111 PTV142 PTD90/PTR90 PDV PTA PTB Taper Codes 1 B A, H, B, E A, H, B, E J, K A, H, B, E Linear only A, H, B, E A, H, B, E B B B B B B B B B B B 2 D C, D, S C, D, S 3 G F, G, T F, G, T C, D, S F, G, T C, D C, D D A A A A A A A A A A F, G F, G G 4* Notes: * Please refer to the datasheets for more information on taper codes * *Custom parts only * All precision potentiometer models are available in linear only. * "S" taper and other tapers are available by special order. Taper A taper is defined as the output curve of resistance, measured between one end of the element and the wiper. It is expressed in percent of total resistance versus percent of effective rotation. Sensors and Controls precision wirewound products and precision single-turn potentiometers are available in linear taper only. Linear taper is the percent of effective electrical clockwise rotation equal to the percent of voltage ratio output, creating a linear output. Audio taper produces a change in output on a logarithmic scale giving the human ear the perception of sound intensity increasing in a linear mode. All other Bourns(R) potentiometers are available in a variety of standard tapers, including audio and reverse audio. Custom tapers are available; consult the factory for complete details and minimum order quantities. Table 1 provides an easy reference for taper codes on all Bourns(R) panel control models. Figure 1 shows the most frequently requested tapers ranked by most popular: 1 = linear taper 2 = audio or log taper 3 = reverse audio or reverse log taper 4 = modified linear or "S" taper 4 3 2 1 Table 1: Taper Codes by Model Figure 1: Popular Tapers 27 Application Notes Temperature Coefficient of Resistance The temperature coefficient of resistance (TCR) is an indication of the maximum change in total resistance that may occur due to a change in ambient operating temperature. This parameter is normally specified in parts per million per degree Celsius (PPM/C). Temperature coefficient is dependent on the type of material used to construct the resistive element and the physical structure of the unit. Potentiometers constructed with cermet, conductive plastic or carbon elements typically have a higher temperature coefficient than those constructed with wirewound elements by approximately twice the value. contact resistance variation (CRV). The rule of thumb for selecting the wiper load is to use the ratio of total resistance (RT) to wiper load (RL) of 1:100 or higher (see Figures 2 and 3.) The following tables will guide you in selecting the correct type of potentiometer for your application. Wiper Load The wiper load must always be specified carefully, as it has a great effect on the wiper output. Unless otherwise specified, Bourns assumes the resistance wiper load to be at least 100 times the value of the potentiometer per the industry standard. In specifying the wiper load, keep in mind that if the current load is too high, linearity will degrade. With conductive plastic elements, excessive wiper load will increase the negative effects of contact resistance and Figure 3: Linearity Affected by Load Figure 2: Error Due to Wiper Loading 28 Application Notes Precision Potentiometers 2 1 1 1 1 3 3 1 1 4 1 4 Resistance Range Resistance Tolerance Temperature Coefficient Power Dissipation Noise/CRV Resolution Adjustability Moisture Stability Linearity Rotational Life Power Rating Relative Price L L M L M M M H M H L L L L L M M M H H H L L L L L M M M M H H L Reg Power Supply Voltage Control RC Freq Control (Calibrated) RCL Bridge Null Control Sweep Delay Control Wirewound 2 2 2 2 2 2 2 2 2 2 2 5 Shaft Angle Sensor Hybitron(R) 2 3 3 3 2 1 2 2 2 1 4 3 Characteristics Multiple-Input Position Sensor Conductive Plastic 1 2 2 1 3 1 2 1 2 4 3 2 Typical Applications Closed-Loop Servo Cermet Element Technology M M M L L M M H H H L M M M M M M M M H H L L H H M L M M M H H L M M M M M H H M H H L Table 2 lists the important performance characteristics of precision potentiometers with an element technology guide along with typical applications that will be encountered. Characteristic importance factors: L=Low, M=Moderate, H=High Element technologies are ranked 1 to 5; 1 is best Table 2: Performance Characteristics of Precision Potentiometers Panel Control Potentiometers Element technologies are ranked 1 to 5; 1 is best M L L M L L L L L H H M M M L H H H M M H L L L L H L L L L L H M Amplifier Gain H L L L H L M L M H L CRT Focus Resistance Range Resistance Tolerance Temperature Coefficient Power Dissipation Noise/CRV Resolution Adjustability Moisture Stability Linearity Rotational Life Power Rating Relative Price Trace Position 2 3 3 4 2 1 1 3 3 1 1 3 RC Freq Control (Uncalibrated) Universal Motor Speed Control Hybitron(R) 3 5 5 5 3 1 4 5 2 4 3 1 Characteristics Triac Control Conductive Plastic 2 2 2 2 4 1 3 1 3 3 1 2 Typical Applications Balance Control Cermet Element Technology M M L M H H H M M H L H L L L L H M M L M H L L L L H M M M M H L Table 3 lists the important performance characteristics of panel control potentiometers with an element technology guide along with typical applications that will be encountered. Characteristic importance factors: L=Low, M=Moderate, H=High Table 3: Performance Characteristics of Panel Control Potentiometers 29 Application Notes Potentiometers Typical Applications and Circuit Configurations The following section will familiarize you with the two basic ways in which a potentiometer is applied in a circuit: voltage divider mode and rheostat mode. Voltage Divider Mode A resistive voltage divider provides an output voltage in reduced proportion to the voltage applied to its input. In its simplest form, it consists of two resistances in series. The input voltage is applied across the total circuit and the output voltage is developed across one of the individual resistances. A potentiometer can act as a variable voltage divider with the resistive element substituted for the two resistances. The wiper provides an adjustable output voltage. The basic variable voltage divider circuit is shown in Figure 4. An input voltage is applied across the entire resistive element. The output voltage is developed across the lower portion of the element between the wiper and one end of the resistive element. Figure 5: Rheostat Circuit CAUTION: CONDUCTIVE PLASTIC AND HYBRITRON(R) ELEMENTS SHOULD BE APPLIED IN VOLTAGE DIVIDER CIRCUITS ONLY. Some typical applications for precision potentiometers are listed below along with circuit configurations and application details. Closed-Loop Servo As a remote shaft position control, the operator moves the panel control to calibrated setting for desired shaft position. The servo potentiometer moves with the panel control shaft to the new balance setting. The input may also be some other signal or sensing device. The motion may be rotary or translatory. Examples are servo-driven meter replacing sensitive D'Arsonval movement, X-Y plotter drives, control surfaces, etc. See Figure 6. Figure 4: Voltage Divider Circuit Rheostat Mode Many applications use the variable resistance between the wiper and one end terminal as a method of current adjustment. This two terminal method of connection is frequently referred to as the rheostat mode. Figure 5 illustrates the basic rheostat circuit. The choice of input and output terminals is arbitrary since the potentiometer, when applied as a current control, is a two-terminal device. 30 Figure 6: Closed-Loop Servo Circuit Application Notes Multiple-Input Position Sensor In this application, a multiple-input circuit takes outputs from two or more position-indicating potentiometers, resulting in a control voltage output proportional to the sum of the shaft positions. The selected series resistor value must be large compared to potentiometer value for maximum accuracy. Different resistors give weighted sums while opposite polarities give differences. See Figure 7. Regulated Power Supply Voltage Control A regulated power supply control uses a highly linear 10-turn precision potentiometer. A digital turnscounting dial can be used to indicate the output voltage. See Figure 9. Figure 9: Regulated PS Voltage Control Circuit Figure 7: Multiple-Input Position Sensor Circuit Shaft Angle Sensor As a shaft angle sensor, the shaft position or direction indicator for rotatable antenna, control surface, valve, tool, etc. The position signal may be indicated, displayed or used to control some related function. See Figure 8. RC Frequency Control (Calibrated) A frequency control in a bridge oscillator requires that the two potentiometers track each other closely. Good linearity is necessary if a calibrated dial is to be used. Wirewound potentiometers work well for frequencies up to a few tens of kHz. At higher frequencies, winding inductance causes problems dictating use of film elements. The resolution of wirewound potentiometers should be considered at the low R (high frequency) end of rotation. Both potentiometers are controlled with a single shaft. See Figure 10. Figure 8: Shaft Angle Sensor Circuit Figure 10: RC Frequency Control Circuit 31 Application Notes RCL Bridge Null Control In this application, the precision potentiometer is used as a dissipation factor dial in a capacitance bridge, and is used in conjunction with a calibrated dial. This application requires the use of a closely controlled output function characteristic found in the precision potentiometer. See Figure 11. Some typical applications for panel control potentiometers are listed below along with circuit configurations and application details. Audio Frequency Balance Control A stereo balance control usually requires a pair of non-linear panel control elements with opposite tapers (log and reverse log), or special elements in which no resistance change takes place over half rotation. The panel control is normally a dual cup unit controlled by a single shaft. See Figure 13. Figure 11: RCL Bridge Null Control Circuit Sweep Delay Control When used as a sweep delay control in an oscilloscope or other types of test instrumentation, the 10-turn precision potentiometer requires precise linearity so that the turns-counting dial reading can be accurately converted to a time interval. See Figure 12. Figure 13: AF Balance Control Circuit Triac Control In this application, the panel control is used as a triac load control (i.e., light dimmer) using a rheostat configuration. The principal concern in this application is wiper current or power dissipation and voltage rating. See Figure 14. Figure 12: Sweep Delay Control Circuit Figure 14: Triac Control Circuit 32 Application Notes RC Frequency Control (Uncalibrated) A panel control can be used as a frequency selector in a square-wave generator. In this application, the panel control is configured as a rheostat with wiper current highest at high frequencies (low R). See Figure 15. Trace Position Used in vertical position control or trace position control for oscilloscope amplifiers, the panel control wiper current is nil in the center, but increases toward each end. Unless limited by specification, CRV may impair adjustability near the ends of rotation. Both panel controls are normally controlled with a single shaft. See Figure 17. Figure 15: RC Frequency Control Circuit Universal Motor Speed Control In this application, the panel control is normally a wirewound in a rheostat configuration capable of substantial wiper current and power dissipation. For higher power motors, the potentiometer is augmented by an SCR. Variable rate of speed change can be accomplished by non-linear potentiometers. Bi-directional speed controls can be accomplished by the addition of a switch. See Figure 16. Figure 17: Trace Position Circuit CRT Focus In this application, the panel control is used as a focus control for a cathode ray tube (CRT). With no DC load present, there is also no wiper current. Attention must be given to the high voltage rating of the control as it may have several hundred volts across the element and operate at several thousand volts from ground. See Figure 18. Figure 16: Motor Speed Control Circuit Figure 18: CRT Focus Circuit 33 Application Notes Encoders Amplifier Gain A panel control can be used as a gain control in an op-amp circuit. The gain is determined by the resistance ratio A = RFB / RIN. See Figure 19. Performance Characteristics Operating Temperature Operating temperature refers to the temperature range at which the encoder can be dynamically operated while remaining within specifications. Contacting encoders typically have a much wider operating temperature range than optical encoders. Contact Resistance Contact resistance refers to the resistance between contacting mechanical parts used to create the digital output signal. Low contact resistance is desirable in most applications. Encoders constructed from noncontacting technology do not have contact resistance. Figure 19: Amplifier Gain Circuit Resolution Resolution refers to the number of electrical pulses per shaft revolution that an encoder produces as a digital output signal. Incremental and absolute contacting encoders are generally limited to low resolutions depending on the materials used in their construction. Optical encoders have a much higher resolution in comparable package sizes. Table 4 lists the important performance characteristics of encoders with a technology guide along with typical applications that will be encountered. Encoders Typical Applications Element technologies are ranked 1 to 2; 1 is best 34 Test & Measurement Professional Audio Factory Automation 1 1 1 1 1 2 1 2 Medical Instrumentation Non-Contacting (Optical) 2 2 2 2 2 1 2 1 Characteristics Automotive Contacting (Mechanical) Encoder Technology Operating Temperature Storage Temperature Operating Speed (RPM) Contact Resistance Resolution (PPR) Moisture Stability Rotational Life Relative Price H H M M M H H M M M H H H H H H H H M H M L L M M M L H M M H M M H H Characteristic importance factors: L=Low, M=Moderate, H=High Table 4: Performance Characteristics of Encoders Application Notes Encoders General Application Information Some general application information that should be considered by designers: * Encoders should be operated within the recommended operating conditions. Electrostatic discharge (ESD) precautions should be observed at all times with non-contacting type encoders due to possible damage to the internal electronics. * Care should be taken to provide adequate current at the proper voltage to the encoder. * Line drivers should be used when connecting to long leads, low-impedance loads, or capacitive loads. Long leads on the output have an associated capacitance, which can degrade high-frequency signals. * Care should be exercised when attaching the encoder to a heat-generating device, such as a motor, to prevent damage to the encoder. The maximum temperature of the heat-generating surface or the free ambient airspace, whichever is greater, should be considered for selection of a suitable encoder with adequate operating temperature range. Signal Conditioning Most applications where rotary contacting encoders are used require the use of filters to condition the digital output signal. Commercially available integrated circuits (IC) or programmable logic chips (PLC) provide the proper debounce and noise filtration. Another alternative for signal conditioning is software programming. The use of debounce filters is recommended with all contacting encoder models to avoid miscounts that may be caused by wiper bounce. Our optical encoder does not require the use of debounce filters due to signal conditioning already provided by the custom designed application specific integrated circuit (ASIC) used in construction of the device. Debounce filters such as the MC14490 Hex Contact Bounce Eliminator manufactured by ON Semiconductor can be used to eliminate encoder contact bounce. The diagram in Figure 20 shows a typical circuit configuration for encoder debounce filtering. For additional information and specification sheet for this device, visit ON Semiconductor's website at http://www.onsemi.com. Note: This device was formerly manufactured by Motorola. * Exceeding the maximum mechanical speed of the encoder may cause permanent damage to the encoder. Exceeding the maximum electrical speed may result in incorrect data or signal error. Figure 20: Typical Debounce Circuit Configuration * Noise in the input power supply or the outputs of an encoder may cause application problems. Some of the common means of minimizing such noise are grounding, twisted pairs, shielded or isolated leads, and signal conditioning. 35 Application Notes Incremental encoders can also be used to drive standard up/down counters. In such cases, we suggest using interface ICs similar to the LS7083 and LS7084 Encoder to Counter Interface Chips manufactured by US Digital. The diagram in Figure 21 shows a typical circuit configuration for an encoder applied to drive an up/down counter. For additional information and specification sheet for these devices, visit US Digital's website at http://www.usdigital.com. Figure 21: Up/Down Counter Driver Circuit ENS Style Encoders Radial Load Axial Load (lb) L10 Life (Hrs) (lb) Push Pull 100 RPM 3,000 RPM 1.0 1 0 8.3 x 106 1.7 x 105 0.5 0 1 8.3 x 106 1.7 x 105 5 1.1 x 104 3.0 3 0 5.5 x 10 1.5 0 3 5.5 x 105 1.1 x 104 6 2.9 x 103 2.5 0 0 1.2 x 10 5.0 0 0 1.4 x 105 2.9 x 103 5 4 4.8 x 102 10.0 0 2.4 x 10 Notes: 1) Radial loads are assumed to be applied 1/2" from the front mounting surface (FMS) 2) The static load rating (C0) is 10.7 lbs. for ENT and ENW styles (1/8" shaft dia.) and 21 lbs. for ENS versions (1/4" shaft dia.). 3) If R=radial load, AP=axial push load and APL=axial pull load, recommended loading limits are as follows: 2R + APL < C0 and, R + AP <C0 Encoders Application Information for EN Series Optical Encoder Bourns(R) optical encoder produces a 2-bit quadrature signal that is suitable for digital systems where both magnitude and direction of adjustment must be provided. Utilizing solid-state electronics to create the output signal, these encoders have no contacts that will wear or create electrical noise. The optical encoder is ideal as a digital panel control or a position-sensing device in applications where long life, reliability, accuracy, and high resolution are critical. Rotational Speed/Life Most bushing mount encoders on the market are limited to rotational speeds of 300 rpm and have a rotational life of 10 x 106 revolutions. To increase operating speed and life specifications, ball bearing shaft supports are added. For high speed and/or extended life applications, Bourns offers shaft ball bearings in either bushing or flange mount versions. With ball bearings, the EN series is capable of operating speeds of 3000+ rpm with a rotational life of up to 5 x 108 revolutions. Shaft Loading To accurately predict the rotational life of an encoder, the end (axial) and side (radial) loading forces should be understood. The relationship between shaft loading and rotational life for the EN series is expressed in the tables below. Life is shown here in operating hours (of continuous rotation) at the speed indicated. Note: Life rating estimates are based on metal fatigue failure criteria. Retention of lubricants may be a limiting factor in extended life applications. ENT and ENW Style Encoders Radial Load Axial Load (lb) L10 Life (Hrs) (lb) Push Pull 100 RPM 3,000 RPM 36 1.0 1 0 4.3 x 106 8.5 x 104 0.5 0 1 4.3 x 106 8.5 x 104 5 5.6 x 103 3.0 3 0 2.8 x 10 1.5 0 3 2.8 x 105 5.6 x 103 5 9.6 x 103 2.5 0 0 4.8 x 10 5.0 0 0 6.0 x 104 1.2 x 103 5 4 2.2 x 102 10.0 0 1.1 x 10 Application Notes Moment of Inertia To determine the rotational inertia for the EN series encoder, use the appropriate formula from the table. Encoder Style Description Rotational Inertia (g-cm2) ENS Ball bearing 1/4" dia. shaft 0.64 + 0.0102 x shaft length modifier ENT Ball bearing 1/8" dia. shaft 0.15 + 0.0006 x shaft length modifier ENW Ball bearing 1/8" dia. shaft servo (flange) mount 0.15 + 0.0006 x shaft length modifier ENA Sleeve bearing 1/4" dia. shaft 0.58 + 0.0102 x shaft length modifier ENC Sleeve bearing 1/8" dia. shaft 0.15 + 0.0006 x shaft length modifier Calculate the shaft length modifier as follows: Express the desired shaft length (from the mounting surface - FMS) in thirty-seconds of an inch, and then subtract 28 from the numerator. The result is the shaft length modifiers. For example: A shaft length (FMS) of 5/8 is equivalent to 20/32. The shaft length modifier is then equal to 20 minus 28, or -8. Shafts The EN Series encoder uses a precision-machined metal shaft. The advantages of this feature are: 1) dimensional accuracy, 2) shaft strength, and 3) design flexibility. In addition to standard options, shafts can be easily customized to application specific requirements including special end features. It is also possible to orient an end feature (such as a flatted shaft) to correspond with the optional index channel output. When specifying a shaft length, measure the distance from the encoder mounting surface to the desired shaft end. Do not specify from the point where the shaft exits the bushing. Shaft Torque Torque is an important parameter sometimes overlooked in the initial design phase. In panel control (manual adjustment) applications, shaft torque must be sufficient to provide the proper "feel" or to insure setting stability. Conversely, in some position feedback and motor driven uses, it is important that torque be minimized. Standard Torque Optional Low Torque Optional Low Torque ENS, ENT, ENW 0.05 oz.-in. typ. 0.01 oz.-in. min. (consult factory) ENA, ENC 0.75 oz.-in. typ. 0.10 oz.-in. min. 10.0 oz.-in. max. Models Torque specifications available from Bourns Shaft Interfacing A number of different techniques have been developed for transmitting linear or rotary motion to an encoder. When selecting the appropriate method, typical considerations are space, cost, operating speed, side and end loading, accuracy and cycle life. Choosing the optimum solution may require some specification compromises. For example, a shaft coupling device chosen to minimize side loading for long cycle life may not provide the best system accuracy. Shaft couplers are commercially available flexible couplers and can be the simplest means of directly interfacing the encoder shaft with another shaft in the system. Two important performance considerations for couplers are: 1) the accuracy with which rotary motion is transmitted to the encoder, (i.e., backlash of the coupler) and 2) the ability to insulate the encoder from side and end loading. Some commonly used flexible couplers are shown below. 37 Application Notes Belt and pulley arrangement can be used to transmit rotary or linear motion to the encoder. Standard timing belts or chains, round belts, wire fishing line, etc., are commonly utilized. A pulley or gear can be mounted directly to the encoder shaft. In some cases it is necessary to reduce heavy side loading created by belt tension. Adding a separate pulley with suitable bearings and connecting the pulley shaft to the encoder with a flexible coupling can accomplish this. Rack and pinion arrangement can easily transmit linear motion to the encoder. The pinion can be attached directly onto the encoder shaft. Other methods of interfacing encoder shafts are: * Tubing or springs pressed onto the shafts * Interlocking shafts * Rubber wheels * Flatted shafts and receptacles * Gear transmission systems When choosing an interfacing technique, remember that the accuracy of the encoder will be no better than the accuracy of the transmission system. 38 Typical Interface Circuits The EN Series Optical Encoder may be used as a manual input device for digitally controlled equipment such as CAD/CAM systems, electronic test equipment, medical electronics, instrumentation, computer peripherals and machine tools. Typically, the encoder drives an up/down counter and is used to control one or more functions. Common applications include motor speed control, cursor control, frequency setting, amplifier gain adjustment and table positioning. This device can also be used for position sensing applications. In this case, a gear can be placed on the encoder shaft allowing it to be interfaced with a moving table, rotating shaft, stepping motor, etc. Movement of the encoder shaft is translated into a 2bit quadrature signal, which (fed through a logic circuit) allows the microprocessor to determine changes in position. As a position feedback device, there are a wide variety of possible uses for an optical encoder including machine tools, plotters, automated storage systems and robotics. Application Notes The logic circuits in Figures 22 and 23 illustrate two techniques for interfacing a quadrature output encoder with a system's microprocessor. Figure 22: Typical Circuit for Producing Direction (up/down) and Magnitude (count) Signals Figure 23: Typical Circuit for Producing Count Up and Count Down Signal If necessary, rise/fall times can be reduced using the inverters as illustrated in Figure 24. The typical switch time for the ASIC used in the EN Series is 500 nanoseconds. In applications where high-speed transition times are encountered, voltage spikes may cause a code output error. To eliminate the voltage spikes, we suggest placing a 0.01mf capacitor in the circuit between Vcc and GND. Figure 24: Circuit for Reducing Signal Rise/Fall Times 39 PRODUCT SELECTION GUIDES 40 Multiturn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter (inch) Physical Shape Turns Mounting Shaft Shaft Shaft Shaft 3751 1/2 1/2 1/2 1/2 Round Round Round Round 11 12 13 Sealable to IP64 N/A N/A Blue Standard Standard Standard Standard Black Optional Optional Optional Optional Bushing Standard Standard N/A N/A N/A N/A Standard Standard Servo Metal N/A N/A N/A N/A Standard Standard Standard Standard Plastic N/A N/A N/A N/A Color Metal Metal Metal Metal Standard Diameter in mm 0.24 0.24 0.24 0.24 Standard Diameter in inches 0.094 0.094 0.094 0.094 Dimensions Standard Length in mm Plastic 3750 10 Snap in Material 3701 Sealable to IP64 Sealable Color 3700 17.45 17.45 9.53 9.53 Standard Length in inches 0.687 0.687 0.375 0.375 Standard Diameter in mm N/A N/A N/A N/A Standard Diameter in inches N/A N/A N/A N/A Optional Optional Optional Optional Knurl Rear Extension Optional Optional Optional Optional Flatted Optional Optional Optional Optional Shaft Torque Starting & Running 0.6 oz.-in. max. 0.6 oz.-in. max. 0.5 oz.-in. max. 0.5 oz.-in. max. Metal Standard Standard N/A N/A Plastic N/A N/A N/A N/A N/A Features Bushing Split Locking Element N/A N/A N/A Wirewound Standard N/A Standard N/A Hybritron(R) N/A Standard N/A Standard Cermet N/A N/A N/A N/A 5 % 10 % 5 % 10 % Maximum 3600 3600 3600 3600 Noise ENR 100 ohms max. N/A 100 ohms max. N/A N/A 0.10 % N/A 0.10 % TR Tolerances EEA Output Smoothness Terminal PC Pins Optional Optional Optional Optional Solder Lug Standard Standard Standard Standard Rear N/A N/A N/A N/A Side Standard Standard Standard Standard J-Hooks Taper N/A N/A N/A N/A Linear Standard Standard Standard Standard Linearity 0.25 % 0.25 % 0.25 % 0.25 % N/A N/A N/A N/A Repeatability of Dial Readout Specifications are subject to change without notice. 41 Multiturn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Resistance Options Order Guidelines 42 3750 3751 100 1K 100 1K Max. Resistance (ohms) 100 K 100 K 100 K 100 K Rotational (No Load) Ganging Available Special 3701 Min. Resistance (ohms) Power Rating Watts Life 3700 1 1 1 1 1M 4M 1M 10 M 1 1 1 1 Ball Bearings Optional Optional Optional Optional Cabling/Connectors Optional Optional Optional Optional Marking Optional Optional Optional Optional A/R Pin Optional Optional N/A N/A Special Linearity Optional Optional Optional Optional Slip Clutch Optional Optional Optional Optional Low Temp Lube Optional Optional Optional Optional Center Tap Optional Optional Optional Optional Min. Order Quantity 50 50 50 50 Min. Special Order Quantity 100 100 100 100 Specifications are subject to change without notice. Multiturn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter (inch) Physical Shape Turns Sealable Color Mounting Shaft Shaft Dimensions Plastic Shaft Shaft Features 7/8 7/8 7/8 7/8 7/8 7/8 Round Round Round Round Round Round 10 10 10 3 5 10 Sealable to IP65 Sealable to IP61 Sealable to IP61 Sealable to IP61 Sealable to IP61 Sealable to IP65 Standard Standard Standard Optional Optional Optional Optional Optional Bushing Standard Standard Standard Standard Standard Standard Servo Optional Optional Optional Optional Optional Optional N/A N/A N/A N/A N/A N/A Standard Standard Standard Standard Standard Standard Metal Standard Plastic Standard N/A N/A N/A N/A N/A Color Metal/Blue Metal Metal Metal Metal Metal Standard Diameter in mm Standard Diameter in inches 6 6.34 6.34 6.34 6.34 6.34 0.249 0.249 0.249 0.249 0.249 0.249 Standard Length in mm 20.62 20.62 20.62 20.62 20.62 20.62 Standard Length in inches 0.812 0.812 0.812 0.812 0.812 0.812 Standard Diameter in mm 6 N/A N/A N/A N/A N/A 0.248 N/A N/A N/A N/A N/A Knurl N/A Optional Optional Optional Optional Optional Rear Extension N/A Optional Optional N/A N/A N/A Optional Optional Optional Optional Optional Optional Standard Diameter in inches Flatted 0.5 oz.-in. max. 0.6 oz.-in. max. 0.6 oz.-in. max. 0.5 oz.-in. max. 0.5 oz.-in. max. 0.6 oz.-in. max. Metal Standard Standard Standard Standard Standard Plastic Standard N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Optional Wirewound Standard Standard N/A Standard Standard Standard Hybritron(R) N/A N/A Standard Optional Optional Standard Cermet N/A N/A N/A N/A N/A N/A 5 % 5 % 10 % 5 % 5 % 3 % 1800 3600 Maximum 3600 3600 3600 1080 Noise ENR 100 ohms max. 100 ohms max. N/A 100 ohms max. Standard 100 ohms max. 100 ohms max. N/A N/A 0.1 % N/A N/A PC Pins Standard N/A N/A N/A N/A N/A Solder Lug Standard Standard Standard Standard Standard Standard 0.1 % Rear N/A N/A N/A N/A N/A N/A Side Standard Standard Standard Standard Standard Standard J-Hooks Taper 3500/3501 Standard Output Smoothness Terminal 3545 Optional TR Tolerances EEA 3543 Standard Split Locking Element 3541 Black Shaft Torque Starting & Running Bushing 3540 Blue Snap in Material 3590 N/A N/A N/A N/A N/A N/A Linear Standard Standard Standard Standard Standard Standard Linearity 0.25 % 0.25 % 0.25 % 0.25 % 0.25 % 0.2 % N/A N/A N/A N/A N/A N/A Repeatability of Dial Readout Specifications are subject to change without notice. 43 Multiturn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Resistance Special Options Guidelines 44 3541 3543 3545 3500/3501 200 100 1K 20 50 50 Max. Resistance (ohms) 100 K 100 K 100 K 50 K 100 K 200 K Rotational (No Load) 2.0 2 2 1 1.5 2 1M 1M 5M 300 K 500 K 2M Multi-section 0 2 2 2 2 2 Ball Bearings N/A N/A N/A N/A N/A Optional Cabling/Connectors Optional Optional Optional Optional Optional Optional Marking Optional Optional Optional Optional Optional Optional A/R Pin Standard Optional Optional Optional Optional Optional Special Linearity Optional Optional Optional Optional Optional Optional Slip Clutch Order 3540 Min. Resistance (ohms) Power Rating Watts Life 3590 N/A Optional Optional Optional Optional Optional Low Temp Lube Optional Optional Optional Optional Optional Optional Center Tap Optional Optional Optional Optional Optional Optional Min. Order Quantity 50 25 50 50 50 50 Min. Special Order Quantity 500 500 500 500 500 500 Specifications are subject to change without notice. Multiturn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Physical Mounting Material Shaft Shaft Shaft Features 3680 1-13/16 3/4 7/8 N/A Round Round Round Square Turns 10 10 10 N/A Sealable to IP65 N/A N/A N/A Blue Standard N/A N/A N/A Black N/A Standard Standard Standard Bushing Standard Standard N/A N/A Servo Optional N/A N/A N/A N/A N/A Standard Standard Metal Standard Clock Face Digital Face Push Button Plastic N/A N/A N/A N/A Color Metal N/A N/A N/A Standard Diameter in mm 6.34 N/A N/A N/A Standard Diameter in inches 0.249 N/A N/A N/A 20.62 N/A N/A N/A Standard Length in inches 0.812 N/A N/A N/A Standard Diameter in mm N/A N/A N/A N/A Dimensions Standard Length in mm Plastic 3610 Shape Snap in Shaft 3600 Package Diameter (inch) Sealable Color 3400 Standard Diameter in inches Knurl Rear Extension Flatted N/A N/A N/A N/A Optional N/A N/A N/A N/A N/A N/A N/A Optional N/A N/A N/A Shaft Torque Starting & Running 2.0 oz.-in. max. 4.0 oz.-in. 4.0 oz.-in. N/A Metal Standard Clock Face Digital Face Push Button Plastic N/A N/A N/A N/A Split Locking N/A N/A N/A N/A Wirewound Standard Standard Standard N/A Hybritron(R) N/A N/A N/A N/A Bushing Element EEA Cermet N/A N/A N/A Standard TR Tolerances 3 % 5 % 5 % 3 % Maximum 3600 3600 3600 N/A Noise ENR 100 ohms max. 100 ohms max. 100 ohms max. N/A 0.1 % Output Smoothness N/A N/A N/A PC Pins N/A N/A N/A N/A Standard N/A N/A Standard Rear N/A Standard Standard Standard Side Standard N/A N/A N/A N/A Standard Standard N/A Linear Standard Standard Standard Standard Linearity 0.15 % 0.5 % 0.5 % 1 % N/A .1 % VR 5 % VR N/A Solder Lug Terminal J-Hooks Taper Repeatability of Dial Readout Specifications are subject to change without notice. 45 Multiturn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Resistance Special Options Order Guidelines 46 3600 3610 3680 Min. Resistance (ohms) 100 100 100 50 Max. Resistance (ohms) 500 K 100 K 100 K 1M Power Rating Watts Life 3400 Rotational (No Load) 5 1.5 1.5 2 2M 200 K 50 K 75 K Multi-section 2 0 0 5 Ball Bearings Optional N/A N/A N/A Cabling/Connectors Optional Optional Optional Optional Marking Optional Optional Optional Optional A/R Pin N/A Standard N/A N/A Special Linearity Optional N/A N/A N/A Slip Clutch Optional N/A N/A N/A Low Temp Lube Optional Optional Optional N/A Center Tap Optional N/A N/A N/A Min. Order Quantity 25 50 50 50 Min. Special Order Quantity 500 500 500 500 Specifications are subject to change without notice. Single-Turn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Physical Mounting 6534 6537 6538 6539 Package Diameter (inch) 1-1/16 7/8 7/8 7/8 BB 7/8 Shape Round Round Round Round Round Turns 1 1 1 1 1 N/A Sealable to IP61 Sealable to IP61 Sealable to IP61 Sealable to IP61 Blue Standard N/A N/A N/A N/A Black N/A N/A N/A N/A N/A Aluminum Standard Standard Standard Standard Standard Bushing Sealable Color 3435 Standard N/A N/A N/A N/A Servo N/A Standard Standard Standard Standard Metal Standard Standard Standard Standard Standard Plastic N/A N/A N/A N/A N/A Color Metal Metal Metal Metal Metal Standard Diameter in mm 3.17 3.17 3.17 3.17 3.17 Standard Diameter in inches 0.125 0.125 0.125 0.125 0.125 Standard Length in mm 22.23 12.7 12.7 12.7 9.53 Standard Length in inches 0.875 0.5 0.5 0.5 0.375 Flatted Optional Optional Optional Optional Optional O-ring Shaft Seal Optional N/A N/A N/A N/A Shaft Torque Starting & Running 0.2 oz.-in. 0.25 oz.-in. 0.5 oz.-in. 0.5 oz.-in. 0.5 oz.-in. Metal Standard N/A N/A N/A N/A Modifications Optional Optional Optional Optional Optional Double Flatted Optional N/A N/A N/A N/A Shorter Optional N/A N/A N/A N/A N/A Standard Standard Standard Standard Shaft Bushing Conductive Plastic Wirewound Element Standard N/A N/A N/A N/A Total Resistance Tolerances 3 % 10 % 10 % 10 % 15 % Effective Electrical Angle 350 320 340 340 340 N/A 0.1 % 0.1 % 0.1 % 0.1 % Output Smoothness (OPS) PC Pins Terminal Taper Solder Lug N/A N/A Optional Optional Optional Standard Standard Standard Standard Standard Standard Rear N/A N/A Standard Standard Side Standard Standard N/A N/A N/A Linear Standard Standard Standard Standard Standard Linearity, Standard 0.50 % 0.50 % 1 % 1 % 2 % Special Linearity 0.25 % N/A 0.50 % 0.50 % 0.50 % Specifications are subject to change without notice. 47 Single-Turn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Resistance 6537 6538 6539 50 1K 1K 1K 1K Max. Resistance (ohms) 50 K 100 K 100 K 100 K 100 K Rotational (No Load) Multiple section 1.5 1 1 1 1 2M 25 M 10 M 20 M 10 M 8 4 N/A N/A N/A Ball Bearings N/A Standard Optional Standard Optional Front Bearing Standard Standard Optional Standard Optional Rear Bearing Standard Standard Optional Standard Optional A/R Pin N/A N/A N/A N/A N/A Special Orientation @ Contact Spring N/A Optional Optional Optional Optional Options Low Temp Lube -40 C Optional Optional Optional Optional Optional Center Tap (Current) Optional Optional Optional Optional Optional Cable/Connectors Optional Optional Optional Optional Optional Marking Label Optional Optional Optional Optional Optional Special EEA Optional Optional Optional Optional Optional Special OPS on Shorter EEA N/A Optional Optional Optional Optional Min. Order Quantity 25 50 50 50 50 Min. Special Order Quantity 500 500 500 500 500 Order Guidelines 48 6534 Min. Resistance (ohms) Power Rating Power-Linear (watts) Life 3435 Specifications are subject to change without notice. Single-Turn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter (inch) Physical Shape Turns Sealable Color Shaft 6637 6638 6657 6574 6674 7/8 7/8 7/8 1-5/16 2 2 Round Round Round Round Round Round 1 1 1 1 1 1 Sealable to IP65 Sealable to IP65 Sealable to IP64 Sealable to IP65 Sealable to IP64 Sealable to IP64 Blue Standard Standard N/A Standard N/A Black Optional Optional N/A Optional N/A N/A N/A N/A Standard N/A Standard Standard Standard Aluminum Mounting 6639 Bushing N/A Standard Standard Standard Standard N/A Servo N/A N/A N/A N/A Standard N/A Metal Standard Standard Standard Standard Standard Standard Plastic Optional N/A N/A Optional N/A N/A Color Metal Metal Metal Metal Metal N/A Standard Diameter in mm 6.34 3.17 3.17 6.34 6.34 6.34 Standard Diameter in inches 0.249 0.125 0.125 0.249 0.249 0.249 Standard Length in mm 22.23 22.23 22.23 22.23 15.9 22.23 Standard Length in inches 0.875 0.875 0.875 0.875 0.625 0.875 Flatted Optional Optional Optional Optional Optional Optional O-ring Shaft Seal Optional Optional Optional Optional N/A Optional Shaft Torque Starting & Running 0.5 oz.-in. 0.5 oz.-in. 0.25 oz.-in. 0.5 oz.-in. 0.75 oz.-in. 0.75 oz.-in. Metal Standard Standard Standard Standard N/A Standard Modifications Optional Optional Optional Optional Optional Optional Double Flatted Optional Optional Optional Optional N/A Optional Shorter Optional Optional Optional Optional N/A Optional Conductive Plastic Standard Standard Standard Standard Standard Standard Bushing Wirewound Element Terminal Total Resistance Tolerances N/A N/A N/A N/A N/A 10 % 10 % 10 % 10 % 10 % Effective Electrical Angle 340 340 340 340 350 350 Output Smoothness (OPS) 0.1 % 0.1 % 0.1 % 0.1 % 0.1 % 0.1 % PC Pins Optional Optional Optional Optional N/A N/A Solder Lug Standard Standard Standard Standard Standard Standard Rear Standard Standard Standard Standard N/A N/A Side N/A N/A N/A N/A Standard Standard Standard Standard Standard Standard Standard Standard 2 % 1 % 1 % 1 % 0.25 % 0.25 % 0.50 % 0.50 % 0.50 % 0.50 % N/A N/A Linear Taper N/A 15 % Linearity, Standard Special Linearity Specifications are subject to change without notice. 49 Single-Turn Precision Controls Product Selection Guide Reliable Electronic Solutions Specifications Resistance 6638 6657 6574 6674 1K 1K 1K 1K 1K 1K Max. Resistance (ohms) 100 K 100 K 100 K 100 K 100 K 100 K Rotational (No Load) Multiple section 1 1 1 1 2 2 10 M 10 M 20 M 10 M 25 M 25 M N/A N/A N/A N/A 4 10 Ball Bearings Optional Optional Standard Optional Standard Standard Front Bearing Optional Optional Standard Optional Standard Standard Rear Bearing Optional Optional Standard Optional Standard Standard A/R Pin Optional Optional N/A Optional N/A N/A Special Orientation @ Contact Spring Optional Optional Optional Optional Optional Optional Options Low Temp Lube -40 C Optional Optional Optional Optional Optional Optional Center Tap (Current) Optional Optional Optional Optional Optional Optional Cable/Connectors Optional Optional Optional Optional Optional Optional Marking Label Optional Optional Optional Optional Optional Optional Special EEA Optional Optional Optional Optional Optional Optional Special OPS on Shorter EEA Optional Optional Optional Optional Optional Optional Min. Order Quantity 50 50 50 50 25 25 Min. Special Order Quantity 500 500 500 500 500 500 Order Guidelines 50 6637 Min. Resistance (ohms) Power Rating Power-Linear (watts) Life 6639 Specifications are subject to change without notice. Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter Physical Shaft Bushing Terminal 9 mm 1/2 inch 1/2 inch Round Round Turns 1 1 1 Sealable Sealable to IP67 Sealable to IP64 Sealable to IP65 Detents N/A N/A N/A Metal Shaft N/A Standard Standard Plastic Shaft Standard N/A N/A 3.15 4.9 6.0, 4.0 Standard Diameter in inches 0.125 0.193 0.250, 0.125 Shaft Color White Metal Metal Metal Bushing Standard Standard Standard Plastic Bushing Standard N/A N/A No Bushing Standard N/A N/A N/A N/A Standard Standard Diameter in mm 6.35 6.0, 4.9 10.0, 7.0 Standard Diameter in inches 0.250 0.250 0.375, 0.250 Standard Standard N/A N/A N/A Standard Standard Diameter in mm Locking Bushing Cermet Wirewound N/A N/A N/A Hybritron(R) N/A N/A N/A J-Hooks N/A N/A Standard PC Pins Standard Standard Standard Solder Lug Rear Side Life Switch N/A Standard N/A N/A N/A Standard N/A N/A N/A N/A Standard N/A N/A Optional Linear CP 20 % Standard Standard N/A Linear CP 10 % N/A N/A N/A CW Audio Cermet 10 % N/A N/A N/A CCW Audio Cermet 10 % N/A N/A N/A Optional Optional N/A CW Audio CP 20 % N/A N/A N/A Optional Optional N/A CCW Audio CP 10 % N/A N/A N/A Linear Wirewound N/A N/A N/A 5 % Independent Linearity Power N/A Standard Linear Cermet 5 % CCW Audio CP 20 % Rating N/A Standard Linear Cermet 10 % CW Audio CP 10 % Resistance 3862 Square Forward Facing Taper 39 Shape Conductive Plastic Element 3310 5 % 5 % Min. Resistance (ohms) 1K 5K 100 Max. Resistance (ohms) 1M 100 K 1M Power-Linear Cermet (watts) N/A N/A 1.0 Power-Linear CP (watts) 0.25 0.25 N/A Power-Audio Cermet (watts) N/A N/A N/A Power-Audio CP (watts) N/A 0.125 N/A Wirewound N/A N/A N/A 50 K Rotational (No Load) 50 K 50 K Rotary Switch Available Standard Standard N/A Push Momentary Switch N/A Standard N/A Specifications are subject to change without notice. 51 Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Multi-section 39 3862 2 N/A N/A Anti-rotation lug Optional Optional Standard Shaft End Features Optional N/A Optional Shaft Flat Optional Optional Optional Shaft Length Variations Optional Optional Optional Maximum 2 inches (50 mm) N/A N/A N/A Dual Concentric Shaft N/A N/A N/A Electrical Angle Variations Optional Optional Optional Terminal Length Variations Optional Optional Optional N/A N/A N/A Optional Optional Optional Optional Surface Mount Torque Wire Harness N/A Optional Special Connectors N/A N/A Optional Options Extra Hardware Optional Optional Optional Mounting Bracket N/A N/A N/A Extended Life N/A N/A N/A Bushing Styles Optional Optional Optional Flatted N/A Optional Optional Double Flatted N/A Optional Optional Optional Optional Optional Marking Servo Mount N/A N/A N/A Optional Optional Optional Continuous Turn N/A N/A N/A Center Detent N/A N/A N/A Multiple Detents N/A N/A N/A Optional Optional Optional Min. Order Qty - 1 & 2 cup 100 1,000 500 Min. Order Qty - 3+ cups N/A N/A N/A 1,000 1,000 1,000 Low Temperature (-40 C) Center Tap Order Guidelines 52 3310 Min. Special Order Quantity Specifications are subject to change without notice. Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter (inch) Shape Physical Turns Sealable Terminal Rating Life Switch 1 1 1 Sealable to IP65 Sealable to IP65 Sealable to IP65 Optional Optional Standard N/A N/A N/A Standard Diameter in mm 6.0, 4.0, 3.0 6.0, 4.0, 3.0 6.0, 4.0, 3.0 Standard Diameter in inches 0.250, 0.125 0.250, 0.125 0.250, 0.125 Metal Metal Metal Standard Standard Standard Plastic Bushing N/A N/A N/A No Bushing N/A N/A N/A Locking Bushing N/A N/A N/A Standard Diameter in mm 10.0, 7.0, 6.0 10.0, 7.0, 6.0 10.0, 7.0, 6.0 Standard Diameter in inches 0.375, 0.250 0.375, 0.250 0.375, 0.250 Conductive Plastic Standard Standard Standard Cermet Standard Standard Standard Wirewound N/A N/A N/A Hybritron(R) N/A N/A N/A N/A J-Hooks N/A N/A PC Pins Standard Standard N/A N/A N/A Standard Optional Optional N/A N/A N/A N/A Side Standard Standard Standard Linear Cermet 10 % Standard Standard Standard Linear Cermet 5 % Optional Optional Optional Linear CP 20 % Standard Standard Standard Linear CP 10 % Optional Optional Optional CW Audio Cermet 10 % Optional Optional Optional CCW Audio Cermet 10 % Optional Optional Optional CW Audio CP 20 % Standard Standard Standard CW Audio CP 10 % Optional Optional Optional CCW Audio CP 20 % Optional Optional Optional CCW Audio CP 10 % Optional Optional Optional N/A N/A N/A 10 % 10 % 10 % Solder Lug Rear Independent Linearity Power 1/2 Square Standard Linear Wirewound Resistance 1/2 Square Optional Forward Facing Taper 1/2 Square Standard Metal Bushing Element 53 Metal Shaft Shaft Color Bushing 52 Detents Plastic Shaft Shaft 51 Min. Resistance (ohms) 150 150 150 Max. Resistance (ohms) 1M 1M 1M Power-Linear Cermet (watts) 1.0 1.0 0.5 Power-Linear CP (watts) 0.5 0.5 0.5 Power-Audio Cermet (watts) 0.5 0.5 0.5 Power-Audio CP (watts) 0.25 0.25 0.25 Wirewound N/A N/A N/A 25 K or 50 K 25 K or 50 K 25 K or 50 K Rotary Switch Available N/A N/A N/A Push Momentary Switch N/A N/A N/A Rotational (No Load) Specifications are subject to change without notice. 53 Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Multi-section 52 53 6 6 6 Anti-rotation lug Optional Optional Optional Shaft End Features Optional Optional Optional Shaft Flat Optional Optional Optional Shaft Length Variations Optional Optional Optional Maximum 2 inches (50 mm) Optional Optional Optional Dual Concentric Shaft Optional Optional Optional Electrical Angle Variations Optional Optional Optional Terminal Length Variations Optional Optional N/A N/A N/A N/A Torque Optional Optional Optional Wire Harness Optional Optional Optional Special Connectors Optional Optional Optional Options Extra Hardware Optional Optional Optional Mounting Bracket Optional Surface Mount Optional Optional Extended Life N/A N/A N/A Bushing Styles Optional Optional Optional Flatted Optional Optional Optional Double Flatted Optional Optional Optional Marking Optional Optional Optional Servo Mount Optional Optional Optional Low Temperature (-40 C) Optional Optional Optional N/A N/A N/A Standard Standard Standard Continuous Turn Center Detent Multiple Detents N/A N/A N/A Optional Optional Optional Min. Order Qty - 1 & 2 cup 500 500 500 Min. Order Qty - 3+ cups 250 250 250 1,000 1,000 1,000 Center Tap Order Guidelines 54 51 Min. Special Order Quantity Specifications are subject to change without notice. Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter (inch) Shape Physical Turns Sealable Detents Metal Shaft Plastic Shaft Shaft Power Life Switch 5/8 5/8 5/8 5/8 5/8 5/8 Square Square Square Square Square Square 1 1 10 10 1 1 Sealable to IP61 Sealable to IP61 Sealable to IP61 Sealable to IP61 Sealable to IP61 Sealable to IP61 N/A N/A N/A N/A N/A N/A Standard Standard Standard Standard Standard Standard N/A N/A N/A N/A 6.0, 4.0 6.0, 4.0 6.0, 4.0 0.250, 0.125 0.250, 0.125 0.250, 0.125 0.250, 0.125 0.250, 0.125 0.250, 0.125 Metal Metal Metal Metal Metal Metal Metal Bushing Standard Standard Standard Standard Standard Standard Plastic Bushing N/A N/A N/A N/A N/A N/A No Bushing N/A N/A N/A N/A N/A N/A Optional Optional Optional Optional Optional Optional Locking Bushing 10.0, 7.0 10.0, 7.0 10.0, 7.0 10.0, 7.0 10.0, 7.0 10.0, 7.0 0.375, 0.250 0.375, 0.250 0.375, 0.250 0.375, 0.250 0.375, 0.250 0.375, 0.250 Conductive Plastic Standard Standard N/A N/A Standard Standard Cermet Standard Standard N/A N/A Standard Standard Wirewound N/A N/A Standard Standard N/A N/A Hybritron(R) N/A N/A Standard Standard N/A N/A J-Hooks N/A Standard N/A N/A N/A Standard PC Pins Standard N/A Standard N/A Standard N/A N/A N/A N/A Standard N/A N/A Solder Lug Rear N/A N/A N/A N/A N/A N/A Forward Facing N/A N/A N/A N/A N/A N/A Side Standard Standard Standard Standard Standard Standard Linear Cermet 10 % Standard Standard N/A N/A Standard Standard Linear Cermet 5 % Optional Optional N/A N/A Optional Optional Linear CP 20 % Standard Standard N/A N/A Standard Standard Linear CP 10 % Optional Optional N/A N/A Optional Optional CW Audio Cermet 10 % Optional Optional N/A N/A Optional Optional CCW Audio Cermet 10 % Optional Optional N/A N/A Optional Optional CW Audio CP 20 % Standard Standard N/A N/A Standard Standard CW Audio CP 10 % Optional Optional N/A N/A Optional Optional CCW Audio CP 20 % Optional Optional N/A N/A Optional Optional CCW Audio CP 10 % Optional Optional N/A N/A Optional Optional N/A N/A Standard Standard N/A N/A 5 % 5 % 0.25 % 0.25 % 5 % 5 % Independent Linearity Rating 86 6.0, 4.0 Linear Wirewound Resistance 85 N/A Standard Diameter in inches Taper 84 6.0, 4.0 Standard Diameter in mm Terminal 83 N/A Shaft Color Element 82 6.0, 4.0 Standard Diameter in mm Standard Diameter in inches Bushing 81 Min. Resistance (ohms) 50 50 200 200 50 50 Max. Resistance (ohms) 1M 1M 100 K 100 K 1M 1M Power-Linear Cermet (watts) 2.0 2.0 N/A N/A 2.0 2.0 Power-Linear CP (watts) 1.0 1.0 N/A N/A 1.0 1.0 Power-Audio Cermet (watts) 1.0 1.0 N/A N/A 1.0 1.0 Power-Audio CP (watts) 0.5 0.5 N/A N/A 0.5 0.5 Wirewound N/A N/A 1.0 1.0 N/A N/A Rotational (No Load) 100 K 100 K 1M 4M 25 K 25 K Rotary Switch Available N/A N/A N/A N/A Standard Standard Push Momentary Switch N/A N/A N/A N/A N/A N/A Specifications are subject to change without notice. 55 Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Multi-section 82 83 84 85 86 4 4 3 3 4 4 Anti-rotation lug Optional Optional Optional Optional Optional Optional Shaft End Features Optional Optional Optional Optional Optional Optional Shaft Flat Optional Optional Optional Optional Optional Optional Shaft Length Variations Optional Optional Optional Optional Optional Optional Maximum 2 inches (50 mm) Optional Optional Optional Optional Optional Optional Dual Concentric Shaft Optional Optional Optional Optional Optional Optional Electrical Angle Variations Optional Optional Optional Optional Optional Optional Terminal Length Variations Optional N/A Optional N/A Optional N/A N/A N/A N/A N/A N/A N/A Torque Optional Optional Optional Optional Optional Optional Wire Harness Optional Optional Optional Optional Optional Optional Special Connectors Optional Optional Optional Optional Optional Optional Options Extra Hardware Optional Optional Optional Optional Optional Optional N/A Surface Mount Mounting Bracket N/A N/A N/A N/A N/A Extended Life Optional Optional N/A N/A N/A N/A Bushing Styles Optional Optional Optional Optional Optional Optional Flatted Optional Optional Optional Optional Optional Optional Double Flatted Optional Optional Optional Optional Optional Optional Marking Optional Optional Optional Optional Optional Optional Servo Mount Optional Optional Optional Optional Optional Optional Low Temperature (-40 C) Optional Optional Optional Optional Optional Optional Continuous Turn Optional Optional N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Center Detent Multiple Detents Center Tap Order Guidelines 56 81 N/A N/A N/A N/A N/A N/A Optional Optional Optional Optional Optional Optional Min. Order Qty - 1 & 2 cup 500 500 250 250 250 250 Min. Order Qty - 3+ cups 250 250 100 100 N/A N/A 1,000 1,000 500 500 1,000 1,000 Min. Special Order Quantity Specifications are subject to change without notice. Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter (inch) Shape Physical Turns Sealable Detents Shaft 91 5/8 5/8 5/8 5/8 5/8 5/8 Square Square Square Square Square Square 1 1 1 1 1 1 1 Sealable to IP61 Sealable to IP61 Sealable to IP61 Sealable to IP61 Sealable to IP61 Sealable to IP65 Sealable to IP61 N/A N/A N/A N/A N/A Optional Optional Optional Optional Optional N/A Plastic Shaft Standard Standard Standard Standard Standard Standard Standard Standard Diameter in mm 6.0, 4.0 Life Switch 6.0, 4.0 6.0, 4.0 6.0, 4.0 6.0, 4.0 6.0, 4.0 6.0, 4.0 0.250, 0.125 0.250, 0.125 0.250, 0.125 0.250, 0.125 0.250, 0.125 0.250, 0.125 Blue Blue Blue Blue Blue Blue Blue Standard Standard Standard Standard Standard Standard Standard Plastic Bushing Standard Standard Standard Standard Standard Standard Standard No Bushing N/A N/A N/A N/A N/A N/A N/A Locking Bushing N/A N/A N/A N/A N/A N/A N/A 10.0, 7.0 10.0, 7.0 10.0, 7.0 10.0, 7.0 10.0, 7.0 10.0, 7.0 10.0, 7.0 0.375, 0.250 0.375, 0.250 0.375, 0.250 0.375, 0.250 0.375, 0.250 0.375, 0.250 Conductive Plastic Standard Standard Standard Standard Standard Standard Standard Cermet Standard Standard Standard Standard Standard Standard Standard Wirewound N/A N/A N/A N/A N/A N/A N/A Hybritron(R) N/A N/A N/A N/A N/A N/A N/A J-Hooks N/A In-Line N/A L-Pattern N/A N/A N/A PC Pins In-Line N/A L-Pattern N/A N/A In-Line N/A N/A N/A N/A N/A Triangle-Pattern N/A Triangle Pattern Solder Lug Rear Optional N/A N/A N/A N/A Optional N/A N/A N/A N/A N/A N/A N/A N/A Side Standard Standard Standard Standard Standard Standard Standard Linear Cermet 10 % Standard Standard Standard Standard Standard Standard Standard Linear Cermet 5 % Optional Optional Optional Optional Optional Optional Optional Linear CP 20 % Standard Standard Standard Standard Standard Standard Standard Linear CP 10 % Optional Optional Optional Optional Optional Optional Optional CW Audio Cermet 10 % Optional Optional Optional Optional Optional Optional Optional CCW Audio Cermet 10 % Optional Optional Optional Optional Optional Optional Optional CW Audio CP 20 % Standard Standard Standard Standard Standard Standard Standard CW Audio CP 10 % Optional Optional Optional Optional Optional Optional Optional CCW Audio CP 20 % Optional Optional Optional Optional Optional Optional Optional CCW Audio CP 10 % Optional Optional Optional Optional Optional Optional Optional N/A N/A N/A N/A N/A N/A N/A 5 % 5 % 5 % 5 % 5 % 5 % 5 % Independent Linearity Rating N/A Metal Bushing Linear Wirewound Power 99 N/A Forward Facing Resistance 96 5/8 Standard Diameter in inches 0.375, 0.250 Taper 95 Optional Standard Diameter in mm Terminal 94 Metal Shaft Shaft Color Element 93 Square Standard Diameter in inches 0.250, 0.125 Bushing 92 Min. Resistance (ohms) 100 100 100 100 100 100 100 Max. Resistance (ohms) 1M 1M 1M 1M 1M 1M 1M 2.0 Power-Linear Cermet (watts) 2.0 2.0 2.0 2.0 2.0 2.0 Power-Linear CP (watts) 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Power-Audio Cermet (watts) 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Power-Audio CP (watts) 0.25 0.25 0.25 0.25 0.25 0.25 0.25 Wirewound N/A N/A N/A N/A N/A N/A N/A 100 K 100 K 100 K 100 K 100 K 100 K 100 K Rotational (No Load) Rotary Switch Available N/A N/A N/A N/A N/A N/A Standard Push Momentary Switch N/A N/A N/A N/A N/A N/A N/A Specifications are subject to change without notice. 57 Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Multi-section Options 58 94 95 96 99 2 2 2 2 2 2 2 Optional Optional Optional Optional Optional Optional Shaft End Features Optional Optional Optional Optional Optional Optional Optional Shaft Flat Optional Optional Optional Optional Optional Optional Optional Shaft Length Variations Optional Optional Optional Optional Optional Optional Optional Maximum 2 inches (50 mm) N/A N/A N/A N/A N/A N/A N/A Dual Concentric Shaft N/A N/A N/A N/A N/A N/A N/A Optional Electrical Angle Variations Optional Optional Optional Optional Optional Optional Terminal Length Variations Optional Optional Optional Optional N/A Optional N/A N/A N/A N/A N/A N/A N/A N/A Torque Optional Optional Optional Optional Optional Optional Optional Wire Harness Optional Optional Optional Optional Optional Optional Optional Connectors Optional Optional Optional Optional Optional Optional Optional Extra Hardware Optional Optional Optional Optional Optional Optional Optional Mounting Bracket Optional Optional Optional Optional Optional Optional N/A Extended Life Optional Optional Optional Optional Optional Optional Optional Bushing Styles Optional Optional Optional Optional Optional Optional Optional Flatted Optional Optional Optional Optional Optional Optional Optional Double Flatted Optional Optional Optional Optional Optional Optional Optional Marking Optional Optional Optional Optional Optional Optional Optional N/A N/A N/A N/A N/A N/A N/A Low Temperature (-40 C) Optional Optional Optional Optional Optional Optional Optional Continuous Turn Optional Optional Optional Optional Optional Optional Optional Center Detent N/A N/A N/A N/A N/A N/A N/A Multiple Detents N/A N/A N/A N/A N/A N/A N/A Optional Center Tap Guidelines 93 Optional Servo Mount Order 92 Anti-rotation lug Surface Mount Special 91 Optional Optional Optional Optional Optional Optional Min. Order Qty - 1 & 2 cup 500 500 500 500 500 500 500 Min. Order Qty - 3+ cups N/A N/A N/A N/A N/A N/A N/A 1,000 1,000 1,000 1,000 1,000 1,000 1,000 Min. Special Order Quantity Specifications are subject to change without notice. Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter (inch) Shape Physical Turns Sealable Detents Shaft Power Rating Switch 3/4 7/8 Round Square 1 1 3-3/4 1 Sealable to IP65 Sealable to IP65 Sealable to IP65 N/A Optional N/A Standard N/A Plastic Shaft N/A N/A N/A Standard Standard Diameter in mm 6.0, 4.0 6.0, 4.0 6.0, 4.0 N/A 0.250, 0.125 0.250, 0.125 0.250, 0.125 0.250, 0.187 Black Metal Metal Metal Metal Bushing Standard Standard Standard N/A Plastic Bushing N/A N/A N/A Standard N/A N/A N/A N/A Locking Bushing No Bushing Standard Standard Standard N/A Standard Diameter in mm 10.0, 7.0 10.0, 7.0 10.0, 7.0 9.0 0.375, 0.250 0.375, 0.250 0.375, 0.250 N/A Standard Standard N/A N/A Cermet N/A Standard Standard N/A Wirewound N/A N/A N/A N/A Hybritron(R) N/A N/A N/A N/A J-Hooks N/A N/A N/A N/A PC Pins Standard Standard Standard Standard Solder Lug Standard Standard Standard Standard Rear Optional Optional Optional Standard Forward Facing Optional Optional Optional Optional Side Standard Standard Standard Standard Linear Cermet 10 % N/A Standard Standard N/A Linear Cermet 5 % N/A Optional Optional N/A Linear CP 20 % N/A N/A N/A Standard Linear CP 10 % Optional N/A N/A N/A CW Audio Cermet 10 % N/A Optional Optional N/A CCW Audio Cermet 10 % N/A Optional Optional N/A CW Audio CP 20 % Optional N/A N/A Optional CW Audio CP 10 % Optional N/A N/A N/A CCW Audio CP 20 % Optional N/A N/A Optional CCW Audio CP 10 % N/A N/A N/A N/A Linear Wirewound N/A N/A N/A N/A 5 % 10 % 10 % 10 % Min. Resistance (ohms) 1K 100 100 500 Max. Resistance (ohms) 1M 1M 1M 1M Power-Linear Cermet (watts) N/A 2.0 2.0 N/A Power-Linear CP (watts) 1.0 N/A N/A 0.75 Power-Audio Cermet (watts) N/A 1.0 1.0 N/A Power-Audio CP (watts) 0.5 N/A N/A 0.25 Wirewound Life 3/4 Round N/A Independent Linearity Resistance 3/4 Round Standard Conductive Plastic Taper PC N/A Standard Diameter in inches Terminal 3856 Standard Shaft Color Element 3852 Metal Shaft Standard Diameter in inches Bushing 3851 N/A N/A N/A N/A 100 K 50 K 50 K 50 K Rotary Switch Available N/A N/A N/A N/A Push Momentary Switch N/A N/A N/A N/A Rotational (No Load) Specifications are subject to change without notice. 59 Panel Controls Product Selection Guide Reliable Electronic Solutions Specifications Multi-section 3852 3856 PC N/A N/A N/A N/A Anti-rotation lug Standard Standard Standard Optional Shaft End Features Optional Optional Optional Optional Shaft Flat Optional Optional Optional Optional Shaft Length Variations Optional Optional Optional Optional Maximum 2 inches (50 mm) Optional Optional Optional N/A N/A N/A N/A N/A Electrical Angle Variations Optional Optional Optional Optional Terminal Length Variations Optional Optional Optional Optional N/A N/A N/A N/A Torque Optional Optional Optional Optional Optional Dual Concentric Shaft Surface Mount Wire Harness Optional Optional Optional Special Connectors Optional Optional Optional Optional Options Extra Hardware Optional Optional Optional Optional Mounting Bracket N/A N/A N/A Optional Extended Life N/A N/A N/A Optional Bushing Styles Optional Optional Optional Optional Flatted Optional Optional Optional N/A Double Flatted Optional Optional Optional N/A Marking Optional Optional Optional Optional Servo Mount N/A N/A N/A N/A Optional Optional Optional Optional Continuous Turn N/A N/A N/A N/A Center Detent N/A N/A N/A Standard Low Temperature (-40 C) Multiple Detents N/A N/A N/A Standard Optional Optional Optional Optional Min. Order Qty - 1 & 2 cup 500 500 500 1,000 Min. Order Qty - 3+ cups N/A N/A N/A N/A 1,000 1,000 1,000 1,000 Center Tap Order Guidelines 60 3851 Min. Special Order Quantity Specifications are subject to change without notice. Commercial Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter (mm) Shape Physical Shaft Turns Element Terminal Taper PTV111/PTT111 PDB12 PTV142 9 9 12 12 14 Square Square Square Round Square 1 1 1 1 1 No No No No No Detents Center Center Center Center Center Metal Shaft N/A Standard N/A N/A N/A Plastic Shaft Standard N/A Standard Standard Standard Standard Diameter in mm 6.0 6.0 6.0 6.0 6.0 Black Metal Black Black Black Metal Bushing Optional Standard Standard Optional Standard No Bushing Standard N/A Standard Standard Standard Locking Bushing N/A N/A N/A N/A N/A Standard Diameter in mm N/A M7x0.75 M9x0.75 N/A M9x0.75 Carbon Standard Standard Standard Standard Standard PC Pins Standard Standard Standard Standard Standard Rear Standard N/A Standard Standard Standard N/A N/A N/A Optional N/A Side Standard Optional Standard Standard Standard Linear 20 % Standard Standard Standard Standard Standard Audio 20 % Standard Standard Standard Standard Standard 20 % 20 % 20 % 20 % 20 % Min. Resistance (ohms) 1K 1K 1K 1K 1K Max. Resistance (ohms) 1M 1M 1M 1M 1M 0.5 Forward Facing Independent Linearity Resistance PTD90/PTR90 Sealable Shaft Color Bushing PTV09 Power Power-Linear (watts) 0.5 0.5 0.5 0.2 Rating Power-Audio (watts) 0.5 0.5 0.5 0.1 0.5 Life Rotational (No Load) 10 K 10 K 10 K 15 K 15 K Rotary Switch Available N/A Standard N/A N/A N/A Multi-Section N/A 8 N/A 2 2 Shaft End Features Optional Optional Optional Optional Optional Standard Switch Shaft Flat Standard Optional Standard Standard Special Shaft Length Optional Optional Optional Optional Optional Options Pin Length Optional Optional Optional Optional Optional Torque Optional Optional Optional N/A Optional Extra Hardware Optional Optional Optional Optional Optional Mounting Bracket Optional N/A Optional Optional Optional Low Temperature (-40 C) Optional Optional Optional Optional Optional Center Tap Order Guidelines N/A N/A Standard N/A N/A Min. Order Quantity 1,000 1,000 1,000 1,000 1,000 Min. Special Order Quantity 50,000 50,000 50,000 50,000 50,000 Specifications are subject to change without notice. 61 Commercial Controls Product Selection Guide Reliable Electronic Solutions Specifications Package Diameter (mm) Physical Shaft Taper 12 10-30 15-60 45-100 Slide Slide Slide Turns 1 1 1 1 1 Sealable No No No Dust Cover Dust Cover Detents N/A Optional Center Center Center Metal Shaft N/A Standard Optional Optional Optional Plastic Shaft Standard N/A Optional Optional Optional 6.0 6.0 6.0 6.0 6.0 Black Metal White White White Standard Standard N/A N/A N/A N/A N/A Standard Standard Standard Standard Diameter in mm No Bushing Locking Bushing N/A N/A N/A N/A N/A M7x0.75 M7x0.75 N/A N/A N/A Carbon Standard Standard Standard Standard Standard PC Pins Standard Standard Standard Standard Standard Rear Standard Optional Optional Optional Optional Forward Facing Optional Optional N/A N/A N/A Side Standard Standard N/A N/A N/A Linear 20 % Standard Standard Standard Standard Standard Audio 20 % Standard Standard Standard Standard Standard 20 % 20 % 20 % 20 % 20 % Min. Resistance (ohms) 1K 1K 1K 1K 1K Max. Resistance (ohms) 1M 1M 1M 1M 1M Power Power-Linear (watts) 0.1 0.2 0.1 0.5 0.125 Rating Power-Audio (watts) 0.05 0.1 0.05 0.025 0.025 Life Rotational (No Load) Switch 15 K 15 K 10 K 15 K 15 K Standard N/A N/A N/A N/A N/A 2 N/A N/A N/A Shaft End Features Optional Optional Optional Optional Optional N/A Rotary Switch Available Multi-Section Shaft Flat Optional Optional N/A N/A Special Shaft Length Optional Optional N/A N/A N/A Options Pin Length Optional Optional Optional Optional Optional Torque N/A Optional Optional Optional Optional Extra Hardware N/A Optional Optional Optional Optional Mounting Bracket N/A Optional N/A N/A N/A Optional Optional Optional Optional Optional Low Temperature (-40 C) Center Tap Order Guidelines 62 PTB Round Independent Linearity Resistance PTA 17 Standard Diameter in mm Terminal PDV Round Metal Bushing Element PDB18 Shape Shaft Color Bushing PDA17 N/A N/A N/A N/A N/A Min. Order Quantity 1,000 1,000 1,000 1,000 1,000 Min. Special Order Quantity 50,000 50,000 50,000 50,000 50,000 Specifications are subject to change without notice. Industrial Encoders Product Selection Guide Reliable Electronic Solutions Specifications Physical Shaft Bushing Terminal Package (LxW) 0.375 mm x without Shaft Length 0.375 mm Sealable Sealable to IP67 Switch Available N/A Detents N/A Material Plastic Standard Diameter in inches 0.125 Standard Diameter in mm 3.18, 2.39 flatted 5.59 mm; 12.7 mm; Shaft Length (FMS) 19.05 mm (w/bushing) Plastic; Material Plated Brass Standard Diameter in inches 0.250 Standard Diameter in mm 6.35 Configuration Output Type Resolution (pulses per rev.) Rotational Speed (max.) Operational Oper. Temperature Range Information Rise/Fall Times Contact Bounce (max.) Contact Rating Mounting Torque Running Torque Life Special Options Order Guidelines 3315 Rotational Life (shaft revs.) Shaft End Features Shaft Length 1 in. or longer Shaft Flat Anti-rotation lug Extra Hardware Servo Mount Ball Bearing version Index Channel (up to 128 ppr) PC Mounting Bracket Pin Length Terminal Configuration Cabling/Connectors Low Temperature Marking Custom Resolution Min. Order Quantity Min. Special Order Quantity Specifications are subject to change without notice. 3 Pin ES EPS ECW EAW EN .78 " square N/A N/A 12, 24 N/A N/A N/A 0.874 x 1.061 x 0.496 " N/A Standard 24 Plastic N/A 4.8 0.874 x 1.122 x 0.585 " N/A N/A 0, 12, 24, 36 Plastic 0.250, 0.187 6.0 0.940 x 1.10 x 0.596 " N/A N/A 30, 36 Plastic 0.250 6.0 0.835 x 0.625 x 0.73 " Sealable to IP65 N/A N/A Stainless Steel 0.250, 0.125 N/A N/A 15.2 mm 1/2 " to 1-1/8 " 19, 22 & 24 mm 3/4 " 1/2 " to 7/8 " Plastic Plastic Plastic Plastic 0.375 9.52 N/A 9.0 N/A 9.0 N/A 9.0 3 Pin 5 Pin 3 Pin 10 Pin Incremental Incremental Incremental Incremental 2-bit gray code, 2-bit gray code, 2-bit gray code, 2-bit gray code, quadrature quadrature quadrature quadrature output output output output Absolute, unique gray code output 6, 16 ppr 6, 9, 12, 24 ppr 6, 9, 12, 24, 36 ppr 6, 9, 12, 24, 36 ppr 30, 36, 128 ppr 120 RPM 120 RPM 120 RPM 120 RPM 120 RPM -55 C to +125 C +1 C to +125 C -40 C to +85 C +1 C to +125 C N/A N/A N/A N/A 5 milliseconds 5 milliseconds 5 milliseconds 5 milliseconds 10 mA @ 10 VDC 10 mA @ 10 VDC 10 mA @ 10 VDC 10 mA @ 10 VDC or 0.1 watt max. or 0.1 watt max. or 0.1 watt max. or 0.1 watt max. 4.0 lbs.-in. max. +1 C to +125 C N/A 2.7 milliseconds 10 mA @ 10 VDC or 0.1 watt max. 7 lbs.-in. max. 7 lbs.-in. max. 7 lbs.-in. max. 7 lbs.-in. max. 5 oz.-in max. N/A 0.75 to 2.25 oz.-in. 0.75 to 2.25 oz.-in. 0.75 to 2.25 oz.-in. 25,000 @ 16 ppr 100,000 @ 6 ppr 200,000 200,000 200,000 50,000 N/A N/A Optional Optional Optional N/A N/A N/A N/A N/A Optional Optional Optional Optional Optional 100 1,000 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Optional Optional Optional Optional Optional 270 990 Optional N/A Optional Optional Optional N/A N/A N/A N/A Optional Optional Optional Optional Optional Optional 135 990 Optional N/A Optional Optional Optional N/A N/A N/A Optional Optional Optional Optional Optional Optional Optional 135 990 Optional N/A Optional Optional Optional N/A N/A N/A Optional Optional Optional Optional Optional Optional Optional 135 990 Aluminum; Ni-Plated Brass 0.375; 0.250 N/A 5 Pin or Cables with & without connector Incremental, 2-bit quadrature output, Index channel optional 25, 50, 64, 100, 125, 128, 200, 256 ppr 200 RPM std. 3000 RPM w/ Ball Bearing -40 C to +85 C 200 ns N/A 26 mA @ 5 VDC or 0.1 watt max. 15-18 lbs.-in. max. 0.1 to 1.5 oz.-in. 10 million std. 200 million w/ Ball Bearing Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional 50 500 63 Commercial Encoders Product Selection Guide Reliable Electronic Solutions Specifications Package (LxW in mm) without Shaft Length Physical Sealable Switch Available Shaft Terminal Guidelines 64 16 x 12.5 mm N/A N/A N/A Standard Standard Standard 12, 24 12, 24 Plastic Plastic Standard Diameter in inches N/A 0.250 0.250 Standard Diameter in mm 6.0 6.0 6.0 15, 20, 25 mm 17.5, 20, 22.5, 25, 30 mm 15, 20, 25, 30 mm Material Zinc N/A Zinc Standard Diameter in inches N/A N/A N/A Standard Diameter in mm M7 N/A M9 Configuration 3, 5 Pin 3, 5 Pin 3, 5 Pin Output Type Incremental 2-bit gray code, quadrature output Incremental 2-bit gray code, quadrature output Incremental 2-bit gray code, quadrature output 12, 18, 24 ppr 12, 24 ppr 12, 24 ppr 60 RPM 100 RPM 100 RPM -30 C to +70 C -10 C to +70 C -10 C to +70 C Information Rise/Fall Times Order 12.4 x 13.2 mm Zinc Operational Oper. Temperature Range Options 12.5 x 13.2 mm 18, 24 Rotational Speed (max.) Special PEC16 Material Resolution (pulses per rev.) Life PEC12 Detents Shaft Length (FMS) Bushing PEC11 N/A N/A N/A Contact Bounce (max.) 5 milliseconds 5 milliseconds 5 milliseconds Contact Rating 1 mA @ 5 VDC 1 mA @ 5 VDC 1 mA @ 5 VDC Mounting Torque 10.2 kgf maximum N/A 10.2 kgf maximum Running Torque 50 to 200 gf-cm 30.6 to 204 g-cm 30.6 to 204 g-cm 30,000 30,000 100,000 Shaft End Features N/A N/A N/A Shaft Length 1 in. or longer N/A N/A N/A Shaft Flat Optional Optional Optional Anti-rotation lug Optional Optional Optional Extra Hardware Optional Optional Optional Servo Mount N/A N/A N/A Ball Bearing version N/A N/A N/A Index Channel (up to 128 ppr) N/A N/A N/A Rotational Life (shaft revs.) PC Mounting Bracket N/A N/A N/A Pin Length N/A N/A N/A Terminal Configuration Optional Optional Optional Cabling/Connectors Optional Optional Optional Low Temperature Optional Optional Optional Marking N/A N/A N/A Custom Resolution N/A N/A N/A Min. Order Quantity 1,000 1,000 1,000 Min. Special Order Quantity 50,000 50,000 50,000 Specifications are subject to change without notice. Turns-Counting Dials Product Selection Guide Reliable Electronic Solutions Specifications Turns Readout Physical H-23 H-46 H-490 0-15 0-15 0-20 0-30 Concentric Scale Concentric Scale Concentric Scale Concentric Scale 25.4 Package Diameter (mm) 22 22 46 Depth (mm) 24 25 25 23 Division/Turn 50 50 100 100 Weight Shaft Part No./Shaft Diameter Dimensions POT/ Dial Selection H-22 Bourns Matching POTS 15 g 15 g 73 g H-22-6A: 1/4 " H-22-6M: 6 mm H-22-3A: 1/8 " H-23-6A: 1/4 " H-23-6M: 6 mm H-23-3A: 1/8 " H-46-6A: 1/4 " H-46-6M: 6 mm 1/4 oz. 3540S 3541H 3543S 3545S 3590S 3540S 3541H 3543S 3545S 3590S 3540S 3541H 3543S 3545S 3590S 3540S 3541H 3543S 3545S 3590S H-506 H-550 CT-23 CT-26 H-493-2: H-494-2: H-491-3: H-492-3: H-493-3: H-494-3: H-492-2: 1/8 1/8 1/4 1/4 1/4 1/4 1/4 " " " " " " " Reliable Electronic Solutions Specifications Turns Readout Physical 0-11 0-10 0-10 Concentric Scale Digital Digital Package Diameter (mm) 22 46 27 28 Depth (mm) 25 25 31.5 31.5 Division/Turn 50 100 500 500 Weight 7g 13 g 34 g 34 g H-506-1/4: 1/4 " H-506-6M: 6 mm H-550-6A: 1/4 " H-550-6A-1: 1/4 " CT-23-6A: 1/4 " CT-23-6M: 6 mm CT-26-6A: 1/4 " CT-26-6M: 6 mm 3540S 3541H 3543S 3545S 3590S 3540S 3541H 3543S 3545S 3590S 3540S 3541H 3543S 3545S 3590S 3540S 3541H 3543S 3545S 3590S Shaft Part No./Shaft Diameter Dimensions POT/ Dial Selection 0-15 Concentric Scale Bourns Matching POTS Specifications are subject to change without notice. 65 Hardware Selection Guide Panel control mounting hardware is determined by bushing style. The "X" in the bushing style column indicates what hardware is used with the bushing. Hardware indicated by a shaded area is normally supplied with unit. Other hardware may be ordered separately. Hardware may be bulk packaged or individually packaged with units, depending on the model. Bushing Style and Dimension Part Number and Description A B C E F J L U N R 3/8 " dia. locking, 3/8 " dia. 1/4 " dia. locking, 1/4 " dia. 1/4 " dia. 3/8 " dia. 9 mm dia. 7 mm dia. 1/4 " dia. 10 mm dia. X X X X X X X X X H-36-1 Flat Washer H-36-2 Flat Washer H-37-1 Lockwasher H-37-2 Lockwasher X H-38-1 Mounting Nut H-38-2 Mounting Nut X X X X X X X X X X X X H-38-3 Lock Nut X H-38-4 Lock Nut X H-37-3 Lockwasher X H-37-4 Lockwasher X H-37-5 Lockwasher H-38-8 M7 Mounting Nut X H-38-9 M10 Mounting Nut X H-38-11 M9 Mounting Nut X H-38-14 M6 Mounting Nut H-W06-MM Flat Washer & Mounting Nut set (1 each) H-W09-MM Flat Washer & Mounting Nut set (1 each) Bushing Style and Dimension Part Number and Description S Model EN T Model 3862 W 3310/ 3315 6 mm dia. 3/8 " dia. 1/4 " dia. 9 mm dia. 1/4" dia. H-36-1 Flat Washer PDA17 PDB18 PTD90 PTV111 PTV142 X H-36-2 Flat Washer H-37-1 Lockwasher Model S Model 50 X X H-37-2 Lockwasher X X H-38-1 Mounting Nut X X H-38-2 Mounting Nut X X H-38-3 Lock Nut X H-38-4 Lock Nut H-37-3 Lockwasher H-37-4 Lockwasher X H-37-5 Lockwasher X H-38-8 M7 Mounting Nut H-38-9 M10 Mounting Nut H-38-11 M9 Mounting Nut H-38-14 M6 Mounting Nut H-W06-MM Flat Washer & Mounting Nut set (1 each) H-W09-MM Flat Washer & Mounting Nut set (1 each) 66 X X X X X X X Specifications are subject to change without notice. Glossary of Terms Absolute code Binary code where only 1-bit changes logic state from one angular position to the next (a.k.a. Gray code). ASIC Application-specific integrated circuit Backlash The maximum difference in shaft position that occurs when the shaft is moved to the same actual output ratio point from opposite directions. Code The digital output signal produced by an encoder. Conductive plastic (CP) A binder or resin blended with carbon powder and/or other conductive material. This material is screened onto an insulating substrate to fabricate resistive elements for potentiometers. Binary Two logical states (High, 1, true/Low, 0 false); the basis of binary data-processing systems. Contact resistance variation (CRV) The variation in resistance between the wiper and a non-wirewound resistive element when the wiper is energized with a specified current and moved over the electrical travel in either direction at a specified speed (does not include the effects of roll-on or roll-off). Binary code A specific code utilizing the binary numbering system (i.e. "0" and "1"). Cycles per revolution (CPR) The number of full quadrature cycles per full shaft revolution (360 mechanical degrees). Bit Cup (incremental encoders) Refers to 1 quantum of data or 1 increment of digital code. (absolute encoders) Refers to the number of tracks which normally equate to 2nth power, i.e., 8 bits = 2 8 = 256 discreet positions, likewise 12 bits = 2 12 = 4,096 discreet positions. Carbon A mixture of carbon powder and phenolic resin that is sprayed, screened, or brushed onto a phenolic or ceramic substrate. Cermet A mixture of metal particles, precious metal oxides, glass powders, blended with a liquid vehicle. This material is typically screened onto a substrate (commonly ceramic) and fired at temperatures that flow glass to fabricate resistive elements for potentiometers. A single mechanical section of a potentiometer. A multi-cup potentiometer may contain one or more sections, either electrical resistance elements or switch modules. Current tap An electrical connection fixed to the resistance element, which is capable of carrying, rated element current and may distort the output characteristic. Electrical cycle One complete four-state quadrature cycle. Each cycle is divided into 360 electrical degrees (e) and can be decoded into 1, 2, or 4 counts, referred to as X1, X2, or X4 resolution multipliers. Electrical degree (e) 1/360 of one full quadrature cycle. 67 Glossary of Terms Dielectric withstanding voltage Ability to withstand under prescribed conditions, a specified potential of a given characteristic between the terminals of each cup and the exposed conducting surfaces of the potentiometer, or between the terminals of each cup and the terminals of every other cup in the potentiometer without exceeding a specified leakage current. Gang An assembly of two or more cups on a common operating shaft. Effective electrical angle (EEA) The total amount of angular input rotation over which the output ratio actually varies. Hybritron(R) A hybrid element consisting of a wirewound element with a conductive plastic coating; this element will exhibit the stability characteristics of a wirewound element with the long operational life of a conductive plastic element. Encoder A device that produces a digital output signal; typically an incremental quadrature, binary, or absolute output signal. This device eliminates the need for analog-to-digital (A/D) signal conversion. End resistance The resistance measured between the wiper terminal and end terminal with the shaft positioned at the corresponding end of mechanical travel. End voltage (non-wirewound) The voltage between the wiper terminal and an end terminal when the shaft is positioned at the corresponding theoretical end point. End voltage is expressed as a percent of the total applied voltage. End voltage (wirewound) The voltage between the wiper terminal and an end terminal when the shaft is positioned at the corresponding end point. End voltage is expressed as a percent of the total applied voltage. Equivalent noise resistance (ENR) The variation in resistance between the wiper and a wirewound resistive element that occurs when the wiper is energized with a specified current and moved over the electrical travel in either direction at a specified speed (does not include the effects of roll-on or roll-off). 68 Gray code Binary code where only 1-bit changes logic state from one angular position to the next (a.k.a. Absolute code). Incremental The repetitive pattern of logic states (High, 1, true/Low, 0 false) in the output signal of an encoder occurring with each successive electrical cycle of resolution. Index The output signal of an index channel is normally a single pulse per revolution. This output can be used to indicate a "zero" or "home" position in the shaft rotation. Adding an index channel to an incremental encoder allows the encoder to provide absolute position. (Also referred to as "Index channel" and "Z-channel") Independent linearity The maximum deviation of the actual wiper output function from a straight reference line with its slope and position chosen to minimize deviations. Interpolation A multiplication technique used to increase encoder resolution. Insulation resistance The resistance to a specified impressed DC voltage between the terminals of each cup and the exposed conducting surfaces of the potentiometer, or between the terminals of each cup and the terminals of every other cup in the potentiometer, under prescribed conditions. Glossary of Terms Lateral runout The perpendicularity of the mounting surface with respect to the rotational axis of the shaft measured on the mounting surface at a specified distance from the outside edge of the mounting surface. The shaft is held fixed and the body of the potentiometer is rotated with specified loads applied radial and axial to the body of the pot. The lateral runout is expressed in inches, TIR. Load The ability of a component to dissipate rated power for a specified length of time under specific operating conditions while remaining within allowable specifications. Mechanical angle The total travel of the shaft between integral stops; in potentiometers without stops, the mechanical travel is continuous. Minimum resistance The resistance measured between the wiper terminal and any other terminal with the shaft positioned to give the minimum value. Noise Any spurious variation in the electrical output not present in the input. Non-wirewound A resistive element made by screening a film of conductive plastic, cermet or carbon inks on a substrate, which may be fabricated from ceramic, phenolic or other type of insulator material. Output ratio The ratio of the output voltage to the designated input reference voltage. Unless otherwise specified, the reference voltage is the total applied voltage. Output voltage The voltage between the wiper and the designated reference point. Unless otherwise specified, the designated reference point is the CCW terminal. Potentiometer A variable resistive device used in applications, which typically require frequent or even constant adjustment. Phase The relationship between channel A and channel B; the rising edge on channel A to rising edge on channel B measured in electrical degrees (e). Phase reference point The reference point on a potentiometer cup, usually an output ratio or an intermediate tap. The reference point is used to align the cups in a multi-cup potentiometer. Pilot diameter runout The eccentricity of the pilot diameter with respect to the rotational axis of the shaft, measured on the pilot diameter. The shaft is held fixed and the body of the potentiometer is rotated with a specified load applied radial to the body of the pot. The eccentricity is expressed in inches, TIR. Power rating The maximum power that a component can dissipate under specified conditions while meeting specified performance requirements. PPR Pulses per Revolution (see Resolution) Quadrature The square wave output code generated by an incremental encoder. Normally, two output channels out of phase by 90e. Output smoothness A measurement of any instantaneous variation in the electrical output not present in the input. 69 Glossary of Terms Resolution (encoder) The number of full quadrature cycles per full shaft revolution (360 mechanical degrees). Each cycle can provide 1, 2, or 4 counts (i.e., X1, X2, and X4 decoding or multiplication) depending on how the signal is decoded. Resolution is normally stated in pulses per revolution (PPR). Resolution (potentiometer) A measure of the sensitivity to which the output ratio of the potentiometer may be set. Rheostat A variable resistor configured so that all the current flows through the wiper. Roll-on/Roll-off The abrupt output voltage or resistance change observed as the shaft is displaced from the end of mechanical travel into the electrical travel. Rotational life The ability of a component to withstand a specified number of cycles under specific operating conditions while remaining within allowable specifications. Running torque The rotational force required to sustain uniform shaft rotation at a specified speed in the clockwise or counterclockwise directions throughout the mechanical travel. Shaft The mechanical input interface of the potentiometer. Shaft endplay The total axial excursion of the shaft, measured at the end of the shaft with a specified axial load supplied alternately in opposite directions. Shaft endplay is expressed in inches. 70 Shaft radial play The total radial excursion of the shaft, measured at a specified distance from the front surface of the component. A specified radial load is applied alternately in opposite directions at a specified point. Shaft radial play is expressed in inches. Shaft revolution One complete 360 turn of the shaft of a rotary encoder in a single direction. Shaft runout The eccentricity of the shaft diameter with respect to the rotational axis of the shaft, measured at a specified distance from the end of the shaft. The body of the potentiometer is held fixed and the shaft is rotated with a specified load applied radial to the shaft. The eccentricity is expressed in inches, TIR. Solderability The adhesion of molten solder to the terminals of a component, producing a continuous coat of solder without voids and pinholes under specified conditions. Starting torque The rotational force required to initiate shaft rotation of a rotary component in the clockwise or counterclockwise directions anywhere in the mechanical travel. State The logic levels generated in the output signal of a digital component (High, 1, true/Low, 0 false). Stop strength The maximum load that can be applied to the shaft at each mechanical stop for a specified period of time without permanent change of the stop positions greater than specified. Glossary of Terms Tap An electrical connection fixed to an intermediate point on the resistive element. Taper The output curve of resistance measured between one end of the element and the wiper. Temperature coefficient The unit of change in resistance per C temperature of resistance (TC) change from a reference temperature to a specified test temperature, expressed in PPM/C. Total applied voltage The total voltage applied between the designated input terminals. Voltage divider A potentiometer configured in a circuit such that the resistive element is substituted for two resistors in series with the wiper providing an adjustable output voltage. Voltage tap An electrical connection fixed to the resistive element, which introduces no significant distortion in the output characteristic. A voltage tap usually has significant tap resistance and may not be capable of carrying the rated element current. Wirewound A resistive element made from multiple turns of wire around an insulated mandrel or cord. Total resistance (TR) The DC resistance between the end terminals with the shaft positioned to give a maximum resistance value. 71 Worldwide Sales Offices Country Phone Fax Benelux: China: France: Germany: Hong Kong: Ireland: Italy: Japan: Singapore: Switzerland: Taiwan: UK: USA: +31-70-3004333 +86-21-64821250 +33-254-735151 +49-69-80078212 +852-2411 5599 +44-1276-691087 +39- 02-38900041 +81-49-269 3204 +65- 63461933 +41-41-7685555 +886-2-25624117 +44-1276-691087 +1-909-781-5500 +31-70-3004345 +86-21-64821249 +33-254-735156 +49-69-80078299 +852-2412 3611 +44-1276-691088 +39-02-38900042 +81-49-269 3297 +65- 63461911 +41-41-7685510 +886-2-25624116 +44-1276-691088 +1-909-781-5006 Non-Listed European Countries: +41- 41-7685555 +41- 41-7685510 Technical Assistance Region Phone Fax Asia-Pacific: Europe: North America: +886-2-25624117 +41- 41-7685555 +1-909 781-5500 +886-2-25624116 +41- 41-7685510 +1-909 781-5700 www.bourns.com Bourns(R) products are available through an extensive network of manufacturer's representatives, agents and distributors. To obtain technical applications assistance, a quotation, or to place an order, contact a Bourns representative in your area. "Hybitron" is a registered trademark of Hybitron, Inc. "Bourns" is a registered trademark of Bourns, Inc. in the U.S. and other countries. COPYRIGHT(c) 2003, BOURNS, INC. * LITHO IN U.S.A. * DP 04/03 * 15M/S0213 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Bourns: H-38-11 H-38-1 H-38-2 H-38-18 H-38-3 H-38-14 H-38-9 H-38-15 H-38-4 H-38-8 H-W09-MM H-36-2