VSP2050GPIB - B&K Precision

MODELS

VSP6020, VSP2050, VSP4030 & VSP12010

High Power Switching DC Power Supplies

Instruction Manual

TABLE OF CONTENTS

SECTION DESCRIPTION PAGE NO.

1TEST INSTRUMENT SAFETY 1

2GENERAL INFORMATION 2

3INSTALLATION 6

4OPERATING INSTRUCTION 10

5MAINTENANCE 19

6REMOTE INTERFACE 21

7CUSTOMER SUPPORT 63

8WARRANTY INFORMATION 64

9SERVICE INFORMATION 65

Section 1

Test Instrument Safety

WARNING

Normal use of test equipment exposes you to a certain amount of danger from electrical

shock because testing must sometimes be performed where exposed voltage is present.

An electrical shock causing 10milliamps of current to pass through the heart will stop most

human heartbeats. A Voltage as low as 35 volts dc or ac (rms.) should be considered

dangerous and hazardous since it can produce a lethal current under certain conditions.

Higher voltages pose an even greater threat because such voltage can more easily produce

a lethal current. Your normal work habits should include all accepted practices to prevent

contact with exposed high voltage and to steer current away from your heart in case of

accidental contact with high voltage. You will significantly reduce the risk factor if you know

and observe the following safety precaution.

1. Don’t expose high voltage needlessly. Remove housings and covers only when necessary.

Turn off equipment while making test connections in high voltage circuits. Discharge high

voltage capacitors after removing power.

2. If possible, familiarize yourself with the equipment being tested and the location of its high

voltage points. However, remember that high voltage may appear at unexpected points in

defective equipment.

3. Use an insulated floor material or a large, insulated floor to stand on and an insulated work

surface on which to place equipment and make certain such surfaces are not damp or wet.

4. Use the time proven “one hand in the pocket” technique while handling an instrument probe.

Be particularly careful to avoid contacting a nearby metal object that could provide a good

ground return path.

5. When testing ac powered equipment, remember that ac line voltage is usually present on

some power input circuits such as the on-off switch, fuses, power transformer etc. any time

the equipment is connected to an ac outlet, even if the equipment is turned off.

6. Some equipment with a two-wire ac power cord, including some with polarized power plugs,

is the “hot chassis” type. This includes most recent television receivers and audio equip-

ment. A plastic wooden cabinet insulates the chassis to protect the customer. When the

cabinet is removed for servicing, a serious shock hazard exists if the chassis is touched. Not

only does this present a dangerous shock hazard, but damage to test equipment. Always

connect an isolation transformer between the ac outlet and the equipment under test. The

B&K Precision Model TR-110 or 1604A Isolation Transformer or Model 1653A or 1655A AC

Power Supply is suitable for most applications. To be on the safe side, treat all two-wire ac

equipment as “hot chassis” unless you are sure it is isolated chassis or an earth ground

chassis.

7. On test instruments or any equipment with a 3-wire ac power plug, use only a 3-wire outlet.

This is a safety feature to keep the housing or other exposed elements at earth ground.

8. B&K Precision products are not authorized for use in any application involving direct contact

between our product and the human body or for use as a critical component in a life support

device or system. Here “direct contact” refers to any connection from or to our equipment

via any cabling or switching means. A “critical component” is any component of a life sup-

port device or system whose failure to perform can be reasonably expected to cause failure

of that device or system or to affect its safety or effectiveness.

Never work all alone. Someone should be nearby to render aid if necessary. Training

in CPR (cardiopulmonary resuscitation) first aid is highly recommended.

Section 2

General information

2.1 INTRODUCTION

2.2 FEATURE

2.3 MARKINGS

2.4 INTERFACE

2.5 SPECIFICATION

2.6 ORDERING INFORMATION

2.1 INTRODUCTION

The VSP SERIES power supplies are designed to deliver power in constant

voltage and constant current mode by switch mode conversion in sleek 1U high

cabinet and in a 19’’ rack construction.

This series comprises the two device soft switching technology that yields

very high efficiency of conversion for dc-to-dc converter part. Also it comprises

power factor correction circuity, which shapes the input current to follow the voltage

to maintain almost unity power factor at full load, and limits the current harmonics in

the input line.

It provides the user the option of isolated analog voltage, current and resis-

tance programming with built-in isolation amplifiers. It gives the option to monitor the

isolated signals with the option to change either from 0 to 5 Volts or from 0 to 10

Volts, for output voltage and current from 0 to full-scale level. It provides the display of

the output voltage, over voltage set level and current with 3-digit LED displays.

Piggyback series pass device ensures the ripple and noise levels to very low values.

Current sharing facility in the module gives the advantage to increase the power with

ease and the vents in the front and the rear enables it with absolutely zero stacking.

The module can be switched on/off through the front panel ON/OFF switch or re-

mote switch on rear panel.

VSP series provides digital interface options for remote programming from

PC. The digital interface provides 12-bit resolution for control as well as monitoring

the output.

Some of the features of the power supply are listed below:

2.2 FEATURES

§MAINS OPERATED, WITH WIDE INPUT RANGE.

§POWER FACTOR CORRECTED INPUT.

§ISOLATED D.C. OUTPUT.

§1200-WATT OUTPUT POWER

§CONSTANT VOLTAGE OPERATION FROM 0 TO FULL-SCALE LEVEL.

§CONSTANT CURRENT OPERATION FROM 0 TO FULL-SCALE LEVEL.

§OVER VOLTAGE CONTROL FACILITY.

§REMOTE SENSING FACILITY.

§PARALLELABLE CURRENT SHARING OUTPUT.

§HIGH OVERALL EFFICIENCY – 80% TYPICAL.

§VERY LOW OUTPUT RIPPLE AND NOISE.

§INPUT EMI FILTERING TO MEET EN55022 CLASS A.

§20 MILLISECOND HOLD-UP TIME.

§TWO FRONT PANEL DPMS. FOR V / O.V AND I.

§MULTI TURN POTENTIOMETERS FOR V, O.V AND I SET.

§FRONT PANEL OUTPUT TERMINALS FOR MONITORING.

§SLEEK, 1U HIGH, 19 INCH RACK CONSTRUCTION.

§INTERNAL FORCED AIR COOLING WITH ZERO STACKING.

§ISOLATED ANALOG VOLTAGE, CURRENT AND RESISTANCE PROGRAMMING

AND MONITORING.

§REMOTE ON/OFF FACILITY.

§RS232/ GPIB/ INTERFACE.

2.3 MARKINGS

The unit has the name PROGRAMMABLE PFC DC SUPPLY written clearly

on the top of the front panel. The Model Number and ratings are also clearly written

on the front panel. The ratings are clearly written on the rear panel, just near the

output terminals.

2.4 INTERFACE

The unit has both local as well as remote controls. For Remote operation, the

series offers analog as well as digital interface or both. Both RS 232 or GPIB digital

interfaces can be provided.

2.5 SPECIFICATIONS

Output Specification

Model VSP6020* VSP2050* VSP4030* VSP12010*

Power 1.2KW 1.2KW 1.2KW 1.2KW

Output Voltage 0–60V 0–20V 0–40V 0–120V

Output Current 0–20A 0–50A 0–30A 0–10A

Ripple rms. (10Hz to 1MHz) <10mV <15mV <10mV <20mV

Noise (10Hz to 20MHz) <45mVpp <45mVpp <45mVpp <45mVpp

Programming Resolution (Digital Interface), LSB (not LED displays)

Voltage 20 mV 10 mV 10 mV 100 mV

Current 10 mA 20 mA 10 mA 10 mA

Output Programming Accuracy (Analog Programming 0 To 5V & 0 To 10V)

Voltage 0.5 % of F. S. ± 1 Digit (spec. for all VSP models)

Current 0.5 % of F. S. ± 1 Digit (spec. for all VSP models)

Meter Accuracy

Voltage +/- 0.2% of F.S. +/- 3 Digit. (spec. for all VSP models)

Current +/- 0.2% of F.S. +/- 3 Digit. (spec. for all VSP models)

Regulation

CV Line Regulation (mV) 0.1 % of F.S (spec. for all VSP models)

CC Line Regulation (mV) 0.1 % of F.S (spec. for all VSP models)

CV Load Regulation (mA) 0.1 % of F.S (spec. for all VSP models)

CC Load Regulation (mA) 0.1 % of F.S (spec. for all VSP models)

Output Specification

Stability 0.05%

Efficiency<80% Minimum

Transient Response 250 microseconds for load change from 40% to 90%

Mode Of Operation

Local Mode Through front panel potentiometer for voltage, current and

over voltage and Push switch for Output ON/ OFF control.

Remote Mode Interface Analog programming of voltage

and current.Voltage: 0 - 5 volts or 0 – 10 volts for output

voltage and current, selection through DIP-switch.

Resistance: 0 – 4.85k ohms from 0 to full-scale level.

Digital Interface RS-232 / GPIB

* = Specification also apply to corresponding GPIB model

F.S = Full Scale. Full scale will be different for each model. Example: If you have a VSP2050

and you are measuring the voltage meter accuracy, the meter can not off more than 0.3V

(20V + 0.2% +3 digit). Note: 3 digits refferes to the power supply displays least significant digit.

Protections

Over voltage protection Programmable through POT in local mode and through

digital interface in remote mode.

Over temperature protection Through 90 °C. thermal switch on heat sink.

Input specifications

Mains Input Range 95Vac to 264Vac.

Input Frequency 47 To 63 Hz

Input Power Factor 0.99 On Full Load At Nominal Input.

Inrush Current Limited By NTC

Operating Environment

Temperature 0 - 50°C

Relative Humidity < 80% rh – non condensing

Storage Temperature - 20°C. to + 70°C.

Warm-up Time 15 minutes.

Safety Standards

EMI Filtering EN55022 Class-A

Safety Class EN60950

Mechanical Specifications

Weight (approx.) 13.7lbs. (6.2 KG.)

Dimensions (WxHxD) 19 x 1.75 x 18” (483 x 44.5 x 457mm)

Dimensions with rubber feet 19 x 2.13 x 20” (483 x 54 x 457mm)

2.6 ORDERING INFORMATION:

MODEL NO DESCRIPTION

VSP6020 60V, 20A power supply with opto-isolated analog interface and RS-232

VSP6020GPIB 60V, 20A power supply with opto-isolated analog interface and GPIB

VSP4030 40V, 30A power supply with opto-isolated analog interfaceandRS-232

VSP4030GPIB 40V, 30A power supply with opto-isolated analog interface and GPIB

VSP2050 20V, 50A power supply with opto-isolated analog interface and RS-232

VSP2050GPIB 20V, 50A power supply with opto-isolated analog interface and GPIB

VSP12010 120V, 10A power supply with opto-isolated analog interface and RS-

232

VSP12010GPIB120V, 10A power supply with opto-isolated analog interface and GPIB

Section 3

Installation

3.1 INTRODUCTION

3.2 UNPACKING

3.3 INPUT POWER REQUIREMENTS

3.4 SYSTEM CONFIGURATION

3.5 INSTALLATION

3.6 TEST EQUIPMENT REQUIREMENTS

3.1 Introduction

VSP series power supply is configured, calibrated and tested prior to shipment.

This unit is therefore ready for immediate use upon receipt. The initial physical inspec-

tions should be made to ensure that no damage has been sustained during shipment.

3.2 Unpacking

Inspect the shipping container before accepting it from the carrier. If damage to

the container is evident, remove the instrument from the container and visually inspect

it for damage to the instrument case and parts.

If damage to the instrument is evident, a description of the damage should be

noted on the carrier’s receipt and signed by the driver or carrier agent. Save all shipping

containers and material for inspection.

Forward a report of any damage to the factory or the agent through which the unit

is procured.

Retain the original packing container if subsequent repackaging for return to the

factory were required. Repackaging is straightforward and is essentially the reverse of

the unpacking. Only subassemblies need to be repackaged for reshipment, use the

original containers.

Remove the Source module from its shipping container and inspect for any dam-

age to the front panel and display module. Also check for any optional parts which may

have been ordered by you. If the switch or display is heavily damaged or is broken then

DO NOT switch-ON the instrument.

Check the rear of the instrument for damage to Sockets or Fuse Holders. In-

spect also the POWER-ON switch on the front panel.

3.3 Input Power Requirements

The Model VSP power supply is configured at the factory to operate from 95-264

VAC at 47-63 Hz power line.

3.4 System Configuration

The Model VSP series power supply comes in ready to use fashion and does not

require any configuration in the field for operation in the local mode. For analog interface

refer to the connector details for the connections.

3.5 Installation

1. AC Input Power Connection

Connect a 3-pin power mains cord to the available line supply. Before connect-

ing line ensure the following:

a) The available line supply is compatible to your unit.

b) The available line supply point is capable of supplying the maximum peak current

and power.

2. Load Connections

Refer fig.3.1A for load connection in local and remote sensing mode, the unit has

5mm brass studs on the rear panel for load connections for model up to 30A. The bus

bar is provided from 30A onwards.

For remote sensing and the current sharing option it is provided with separate 6

way terminal block. This is required if your load is far away & regulation needs to be

maintained at load terminals.

An output cable should be able to handle the full load current and maximum

voltage and power under worst case conditions of temperature, humidity, mechani-

cal abuse, and effects of long term aging.

3. Analog Interface Connections

A 25 pin D type connector & DIP switch is provided for remote analog interface

to the unit. There is 8 pin DIP switch associated with the function of analog interface.

Refer to section 4.3.5 of chapter 4 for switch settings.

4. Turn-On

Switch the POWER ON switch to the ON position. Soon the DPM will be turned

on & the output voltage & current are displayed, if output on-off switch is in ON position.

Voltmeter should display the voltage set by voltage control.

Check the current meter. It must show zero (very low) current under no load. If

not then please switch off the unit and call the service personnel.

For details of TURN ON CHECK refer section 4.5 of CHAPTER 4.

3.6 Test Equipment Requirements

The following instruments will be required to test the complete installation of the

unit.

1). A four and half digit or better digital multimeter for verifying the voltage and current

output of the unit.

2). A 20 MHz dual channel oscilloscope for verifying the Ripple in Output of the Source.

3). A Resistive load or an Electronic Load to take an input to suit the maximum

output from the unit depending on the model and capacity of the channel of the

Source.

NC 2

VPROGI 3

VPIN 4

VPROGR 5

AGND3 6

NC 7

NC 8

IPIN 9

IPROGI 10

IPROGR 11

NC 12

NC 13

NC 14

+12V 15

AGND3 16

REMOTE ON/OFF 17

AMX 18

VMX 19

AGND3 20

NC 21

VPSET 22

VMSET 23

IPSET 24

IMSET 25

+S 1

-3

-S 4

NC 5

CS BUS 6

+S 1

-3

-S 4

NC 5

CS BUS 6

Output +VE

Output -VE

LOAD

REMOTE SENSING

Output +VE

Output -VE

LOAD

LOCAL SENSING

SWITCH CONFIGURATION

(ON REAR PANEL)

Fig 3.1a : CONNECTION DETAILS IN LOCAL & REMOTE INTERFACE

LOCAL MODE

NC 1

87654321

Section 4

Operating instruction

4.1 INTRODUCTION

4.2 FRONT PANEL DESCRIPTION

4.3 REAR PANEL DESCRIPTION

4.4 POWER ON CHECK

4.5 OPERATING INSTRUCTIONS IN LOCAL MODE

4.6 OPERATING INSTRUCTIONS IN ANALOG REMOTE INTERFACE

4.7 OPERATING INSTRUCTIONS IN DIGITAL INTERFACE

4.8 TRIP INDICATIONS

4.1 INTRODUCTION

The VSP series Model is a variable switch mode power supply to provide wide

range of DC supply from 0 to full-scale specified voltage. This chapter explains the

operating procedure of the unit. The operation is very simple by providing POT control

for voltage, current limit and over voltage protection limit and 8 way DIP switch along

with 25 Pin D type connector for the remote programming interface.

Optional RS232 interface or GPIB interface can be provided as per the order

placed. In case of RS232 interface, a slide switch no. 7 on 8 pin DIP switch array on the

rear panel facilitates either LOCAL/ RS232 communication interface or Analog pro-

gramming.

The unit is internally fan cooled. The air inlet vents are provided on the front panel.

The air outlet is a rectangular slotted area on the 1U high rear panel, and is located

between the A.C. input and D.C.output connectors.

The instrument front panel and rear panel are described first in detail, explain-

ing the layout, identification, function and usage of each item on the panel. The Turn-

on sequence and the procedure to use the major functions and operation of unit in

digital interface are also explained. At the end all the ALARM indications, errors and

warning signals are explained. In the same section procedures to clear the TRIP and

ALARM conditions are discussed.

4.2 FRONT PANEL DESCRIPTION

Figure 4.1 shows layout of front panel. On the front panel following controls and

indicators are provided.

1. Main ON/OFF switch with neon indication.

2. 3 digit display for Voltage/ Set Voltage/ Set Over Voltage indication

3. 3 digit display for Current/ Set Current indication.

4. 10 turn POT for voltage control.

5. 10 turn POT for current control.

6. 10 turn POT for over voltage protection control.

7. Push switch to view set parameters in SET mode.

8. Latch type Push switch for Output ON/OFF control.

9. LED indications for CV, CC, Output ON, Trip, Remote, V set, I set, O/V set and

Set mode.

- The display shows 3 digit value for voltage and current parameters. The resolution of

indication is 0.1 volt and 0.1 amp for voltage and current parameters. The display is

used to show actual output voltage and current or to show set values of voltage, over

voltage and set current limit in the set mode. The set mode is activated using Set key

during output OFF condition.

- CV LED indicates the constant voltage operation of power supply.

- CC LED indicates constant current operation of power supply.

- TRIP LED becomes ON either for over voltage trip condition or for over temperature

trip condition.

- Output ON/OFF can be controlled by push button switch (latch type) and LED turns

ON if output is available.

- Remote LED is provided for the digital interface option. It lights up when the power

supply is controlled by external digital interface.

- To view the set values of POT on the display press the SET key. Also LED’s for

each POT and common SET MODE Led is provided.

- Also monitoring terminals of output are provided on front panel so that user can verify

the output with calibrated meter. Additional earth terminal is also provided on front

panel.

4.3 REAR PANEL DESCRIPTION

The rear panel of the unit is shown in fig 4.2. The mains input connection is

made through a mains cord and is located on the right side of the unit at the rear.

A 20A fuse of type ’F’ is used for line input range 95Vac to 264Vac,) provided at input.

At the center are the oval shaped ventilation slots for air exhaust, for D.C. output 5mm

brass studs or bus bars (as per the current specifications) are provided, next to

it is 6 way terminal block for remote sensing and current share bus. Further is the 25

pin D-type connector for analog interfacing & the associated 8 pin DIP switch for

selection of analog mode operation and it’s associated modes of operation. Above the

25 pin D-type connector the provision is made for digital interface connection, which

can be either GPIB or RS232.

13 14 15 16

17 17

Sr. No. Description Sr. No. Description

1Input Line Cable 14 Output Sense Terminals

2Input Fuse 15 Analog Interface Connector

3Input R. F. Filter 16 DIP switches for Analog Interface

selection

4VSP-PFC-1.2KW-1103D, PCB 17 Cooling Fans

5Input ON/OFF Switch 18 SBC-IEB-0504A, PCB (For GPIB)

6Heat Sinks 19 VSP-POT-IMON-0604A, PCB

7PFC Choke 20 VSP-FPDAC CONV-0604A, PCB

8DC DC Converter Transformer 21 Voltage Monitoring Terminals

9VSP-DPM-CONT-1204D, PCB 22 VSP-DPM-1UFP-0604D, PCB

10 VSP-FAN-CNT-1103C, PCB 23 Potentiometers for control

11 VSPDDC-1.2KW-0704E, PCB 24 SET, ON/OFF switch Assembly

12 Digital Interface PCB 25 Earth Terminal

13 Output Power Terminals 26 Handles

GENERAL ASSEMBLY DRAWING OF VSP SERIES POWER SUPPLY

4.3.1 LINE INPUT

The mains input range is clearly indicated on rear panel. The unit comes stan-

dard with a U.S. standard plug and a mains input rating of 95VAC to 265VAC, 50/60Hz.

4.3.2 INPUT FUSE

This fuse protects the unit against short circuits and over loading. The 20A

fuse of type ’F’ is used for line input range 95Vac to 264Vac.

4.3.3 DC OUTPUT TERMINALS

VSP models with upto 30 amp output ratings have a pair of 5mm brass studs is

provided on the rear panel. Models above 30 amps have bus bars are provided. Output

polarity is shown near the terminal.

4.3.4 REMOTE SENSE CONNECTOR

6 Way terminals block is provided for remote sensing and current

share option.

1. +S: - Positive Sense terminal for remote sensing.

2. +Output: - Positive DC output terminal.

3. -Output: - Negative DC output terminal.

4. -S: - Negative Sense terminal for remote sensing.

5. NC

6. CS Bus: - Current share bus for parallel operation.

4.3.5 ANALOG INTERFACE CONNECTOR (Reference Fig. 4.1a and 4.1b in back of

manual)

25 Pin D type connector is provided for remote analog interface, it is factory set

to operate through the front panel controls.

Pin no. 1: N.C.

Pin no. 2: N.C.

Pin no. 3: VPROGI-1 mA (typical) Current source for voltage programming.

Pin no. 4: VPIN - Input for voltage programming.

Pin no. 5: VPROGR - Resistance programming (0 to 4.85KOhms for full-scale volt-

age)

Pin no. 6: AGND3 - Common terminal for remote programming.

Pin no. 7: N.C.

Pin no. 8: N.C.

Pin no. 9: IPIN - Input for Current programming.

Pin no.10: IPROGI- 1mA (typical) Current source for Current programming.

Pin no.11: IPROGR - Resistance programming (0 to 4.85KOhms for full-scale cur-

rent)

Pin no.12: N.C.

Pin no.13: N.C.

Pin no.14: N.C.

Pin no.15: +12 V- Remote on/off relay supply +ve.

Pin no.16: AGND3 - Common terminal for remote programming.

Pin no.17: Remote On/Off - Remote on/off relay.

Pin no.18: AMX- Output Current monitoring. (Factory set to 0 to 5 volts for full scale)

Pin no.19: VMX - Output Voltage monitoring. (Factory set to 0 to 5 volts for full scale)

Pin no. 20: AGND3 - Common terminal for remote monitoring.

Pin no. 21: N.C.

Pin no. 22: VPSET - External programming option set for output voltage.

Pin no. 23: VMSET -External-monitoring option set for monitoring the output voltage.

Pin no. 24: IPSET - External programming option set for output current.

Pin no. 25: IMSET - External monitoring option set for current.

4.3.6 DIP SWITCH DETAILS.

DIP Switch is provided on the rear panel to facilitates remote analog interface as

well as local mode interface in the power supply by just changing the switch positions

Switch no. 1 & 2 are associated with voltage programming

Switch no. 3 & 4 are associated with current programming

Switch no. 5 is associated with 0-5V & 0-10V programming

Switch no. 6 is associated 0-5V & 0-10V monitoring

Switch no. 7 is Local/RS232 and Analog interface selection

Switch no. 8 is associated with remote ON-OFF.

4.3.7 DIGITAL COMMUNICATION INTERFACE (optional)

Digital communication interface either GPIB or RS-232 interface can be incor-

porated with the system as per the order placed. As per the ordered digital communi-

cation interface, the slots are available on the rear panel

The slide switch no. 7 on 8 pin DIP switch array selects the LOCAL/RS232 or Analog

interface & 9 pin D-Type connector is provided on rear panel to connect the unit to PC.

NOTE: Refer Chapter 5 For Details Of Digital Communication Interface.

4.4 POWER ON CHECK

Keep the DIP switch settings for local mode operation. (Refer to 4.5)

After switching ON the unit, the display will show the actual voltage and current at the

output if output ON/OFF switch is in pressed position. If the switch is in OFF position

then the output voltage goes to 0V & displays zero. Also LED associated with key

shows the condition of output. If TRIP LED is ON then display show zero values and

LED associated with ON/OFF key remains off.

4.5 OPERATING INSTRUCTIONS IN LOCAL MODE

These are the instructions for operating the source in local mode. Initially after

Power ON Unit work in local mode.In local mode the power supply can be controlled

through front panel potentiometers.

Also Refer to the settings of 8Way DIP Switch provided on rear panel to operate in

Local mode.

Switch No. 12345678

Position On On On On On OFF On On

Refer fig. 3.1a for connection details in local & remote interface

Normally user can vary the V SET POT to change the output voltage while working

in constant voltage mode operation. I SET POT is used to set the output current

while working in constant current mode operation.

4.5.1 SET MODE OPERATION IN LOCAL MODE

User can view the set parameters using set mode operation before

turning the output ON. To enter the SET mode, switch off the ON/OFF switch.

When SET key is pressed for the first time then SET LED turns ON and display

shows OVP value and OVP POT LED keeps on flashing. In this mode the OVP POT

can be used to change the over voltage limit. On pressing the SET key again the

display shows the set voltage and VSET POT LED keeps on flashing. In this mode

the VSET POT can be used to change the output voltage. On pressing the SET key

again the display shows the set current and ISET POT LED keeps on flashing. In this

mode the ISET POT can be used to change the output current.

Set mode operation ends after pressing SET key fourth time & displays zero if the

output on / off switch is off. At any instant, while in set mode, if output on / off switch

is pressed the display displays the output voltage & current.

4.6 OPERATING INSTRUCTIONS IN ANALOG REMOTE INTERFACE

The Remote analog interface is Provided to control the power supply with

external analog signals.Before using the interface check the type of digital interface

provided with the system.

A slide switch no. 7 on 8 pin DIP switch array is provided at the rear panel to bypass

digital and front panel pot controls. Ensure the position of slide switch is in off

position when operating with external analog controls.

When GPIB interface is used then internal adjustment is required to bypass the GPIB

interface. Refer to GPIB section of Chapter 6.

Following are the positions of switches for the operating the source in remote mode

by external analog voltage and resistance.

4.6.1 Voltage Programming

Apply the input programming voltage of 0 to 5Volts or 0 to10 Volts between pin 4

& common control pin 6 of 25 pin D type connector for voltage programming & for

current programming between 9 & 6 (common control pin) of 25 pin D-Type connector.

8 pin DIP switch on rear panel:

Switch No. 12345678

Position Off Off Off Off off On

5 = ON for 0-5V programming

5 = OFF for 0-10V programming

6 = OFF for 0-5V monitoring

6 = ON for 0-10V monitoring

Refer fig. 4.1a for remote voltage and current programming and monitoring

It also explains load connections required in this mode.

Note: Factory set for 0 to 5 volts for full scale output programming and moni-

toring.

4.6.2 Resistance Programming

For resistance programming standard resistor used is 4.85KOhms.

Following shows the DIP switch configuration required in this mode & explains the

connection of the resistor to the 25 pin D-type connector.

8 pin DIP switch on rear panel:

Switch No. 12345678

Position Off On Off On On off On

6 = OFF for 0-5V monitoring

6 = ON for 0-10V monitoring

Refer figure 4.1b for external resistance programming 0 to 4.85kohms for full

scale voltage and current . It also shows the load connections required in this mode.

As shown in the figure for Voltage Control connect the resistance of 4.85 K ohms at

pin 4 & common control pin 6 of 25 pin D Type connector & for Current control

connect resistance between pin 9 & pin 6 (common control pin) of 25 pin D Type

connector.

4.6.3 Remote ON/OFF:

A 25 pin D type connector & DIP switch is provided for remote analog interface to

the unit. There is 8 pin DIP switch associated with the function of analog interface.

SW no. 8 on the rear 8 pin DIP switch is Remote ON/OFF control & must be always on

for terminal voltage ON when operated from the local controls.

For the remote control keep SW no. 8 OFF and connect switch across pin no. 16 &

17 of 25 pin D type connector.

4.7 OPERATING INSTRUCTIONS IN DIGITAL INTERFACE

To enable remote interface, the command for system to enter remote mode

must be entered through remote P.C. This will cause the remote LED on front panel

to glow; now no key on front panel will be detected. However the display will be

updated to indicate the entered value.

In GPIB interface proper address must be given.

To change the output voltage while working in constant voltage mode operation

or to set the output current while working in constant current mode operation, user

has just to enter command (as specified in chapter 5) through remote PC. There are

simple commands to take the unit either in remote or local mode. The status of the

power supply can be easily read using specific commands. The output can be

turned ON or OFF as per requirements. Output ON is indicated by ON LED on the

front panel. Also the over voltage limit can be set. Whenever the output voltage

exceeds this maximum limit the trip condition occurs thereby resetting the output.

The command summary is given in detail in chapter 5.

4.8 TRIP INDICATIONS

The VSP series power supplies has provision of Over Voltage & Over Tem-

perature protection. If at any time one of these conditions occurs, the unit will be

tripped. This means that the output voltage is made to be zero. This condition is

indicated by the Trip LED blinking.

4.8.1 RESETTING THE TRIP CONDITION

Assess as to why the trip has occurred. Then isolate the fault e.g., over voltage

trip condition can be reset by lowering the output voltage than OV trip level & then

toggling the input power will reset trip condition.

For resetting the over temp condition allow some time for cooling the heat

sinks to change the status of thermal switch.

5.1 INTRODUCTION

5.2 PREVENTIVE MAINTENANCE

5.3 SERVICE INFORMATION

5.1 Introduction

This chapter contains the problems that may occur in the field in the event

of long use. The procedure to test the unit is explained under the proper section.

The individual is advised to use the correct procedure provided for the

purpose of operating the particular sequence to set proper voltages and current

required to test the proper working of the unit.

This unit has few boards and interconnections and the reliability is very

high. However, if a failure occurs the user himself might be able to fix the unit by

following the remedies given under particular complaint.

Read the manual completely in order to understand your unit better.

5.2 Preventive Maintenance

Please follow the following preventive steps to ensure the proper operation of your

instrument.

*Allow enough natural cooling (ventilation) around the unit.

*Avoid keeping tools, equipment etc. on the top cover.

* Keep the working area neat and clean always.

*Do not exceed the input/output limits at any time.

5.3 Complaints and Service Information

Some of the common problems that may occur and the remedy to put back

the instrument back in to a working condition as fast as possible are given below:

Section 5

Maintenance

When the unit is not turning ON.

Check if the power ON/OFF switch is turned ON. Check whether fuse

mounted on the rear panel is OK? If fuse is good then check the power cord. Please

make sure that the power cord connecting to the unit is properly connected. Please

also check the mains switch. Check the switch 8 on rear panel, it must be always in

ON position for terminal voltage ON.

When the Trip LED turns On and output turns OFF

Check the settings of the over voltage potentiometer. It should not be less

than the output set potentiometer. Check the loads at the output. Check whether the

temperature inside the unit is not increased abnormally.

No Voltage Output available at the output Terminal

The possibility is that the Output module itself has failed. The output series

pass section may be faulty, therefore check the series pass device & control IC.

No display on the front panel meters

Check the input conditions and the actual output on the terminals. If it is OK,

then the supply to the meters may not be proper or displays may be damaged.

Further service information is provided in “Service Information” located at the end of this

instruction manual.

Section 6

Remote interface

6.1 INTRODUCTION

6.2 RS232C INTERFACE

6.3 RS232C OPERATION

6.4 IEEE-488 OPERATION

6.5 INTRODUCTION TO SCPI LANGUAGE

6.6 COMMAND SUMMARY

6.7 MANDATORY COMMANDS

6.8 INSTRUMENT COMMANDS

6.9 IEEE-4888 COMPLIANCE INFORMATION

6.10 SRQ HANDLING DETAILS

6.11ERROR MESSAGES & REPORTING

6.12 APPLICATION PROGRAM EXAMPLES

6.1 Introduction

VSP series power supplies are configured for either RS232C or GPIB as per

the order placed (refer chapter 1 for ordering information). When the unit is first

TURNED ON it will enter into LOCAL mode of operation.

If the unit is configured for RS232 interface, then by proper slide switch setting

& by connecting a serial port of P.C to 9- pin D-type connector on rear panel of the

unit, executing RS232 interface commands can operate the power supply.

If the unit is configured for GPIB interface, proper address settings are re-

quired. Standard commands, which are defined in following sections, through remote

PC can operate the power supply.

Following sections cover each interfaces separately & explains the opera-

tions, configurations & commands of each interface.

To use any of the digital interfaces mentioned above, proper setup is required.

For RS232 interface setup requirement is a PC with functioning serial port whereas

for GPIB interface PC with functioning parallel port is necessary.

6.2 RS232C INTERFACE:

The basic principle of RS232C operation is achieved by 3-wire interface. The

3-wire interface comprises of transmit pin (abbreviated as TXD), receive pin (abbre-

viated as RXD) and a common ground pin (GND). TXD pin of host is connected to

the RXD pin of the instrument and the RXD pin of the host is connected to the TXD

pin of the instrument and the third line connects the GROUNDs of the two sides. I.e.

the TXD and RXD lines are cross-connected to the Host controller.

Hardware HANDSHAKE lines are not used.

The RS232 communications is based on the SEND and RECEIVE signals

only. It does not provide the handshaking protocol. The instrument is designed to

receive all data without missing any of them with the baud rate specified. Standard

baud rate being 9600. The host or the controller (Central Computer) should take

care to read the data at the same speed of the instrument as defined by the baud

rate. The following communication parameters are FIXED for this particular instru-

ment when operating in the RS232C mode. :

POWER ON BAUD RATE 9600 BAUD

CHARACTER LENGTH 8 BITS

STOP BITS 1 BIT

PARITY NO PARITY

HANDSHAKING NO HANDSHAKING

6.3 RS232C Operation

The default communication parameters for RS232C are as follows:

1) BAUD RATE:

The default baud rate is 9600 Baud.

At present the provision for changing the baud rate in LOCAL mode is not available.

2) CHARACTER LENGTH:

The character length is 8 BITS. This is also fixed and cannot be changed by instru-

ment commands.

3) STOP BITS:

The instrument generates 1 stop BIT after each character transmission and checks

for the same during reception. This parameter is also fixed.

4) PARITY:

No PARITY checking is provided. This default configuration is also fixed.

5) HANDSHAKING:

No HANDSHAKING is provided. So the host can send all the data at the defined baud

rate. And at the same time it should be ready to receive the data or response without

any delay.

6.3.1 RS232 Data Format

One Start Bit 8 Data Bits No Parity Bit 1 Stop Bit

6.3.2 RS232 Connector Details

On the rear panel of the unit, a 9 pin D-type male connector is provided for the

RS232 communication. The DSR and DTR handshake lines are not used. But the

interface cable which connects the COMM INTF on the instrument to the PC COM

port (COM 1 or COM 2) should interconnect the RXD and the TXD line, such that the

RXD input the instrument is the TXD output of the host controller or PC. Swapping is

done internally to avoid confusion in the connection. The connector definition of the

‘COMM INTF’ (as marked on the rear panel) are given below:

PIN NUMBER DESCRIPTION

PIN 2 Receive Data (RXD)

PIN 3 Transmit Data (TXD)

PIN 5 Ground (GND)

Since the RS232 communication does not use the handshaking the DSR

input of the controller should be tied up to a signal that is always TRUE. However

this implies that your BUS CONTROLLER must always be ready to accept the

data. So the interface cable has to be a customized one. Refer fig 6.1.

Fig. 6.1

6.3.3 INSTALLATION OF RS232 CARD

The RS232 Interface (ISO_RS232_CONV-1103 Card) card may come already

installed, if ordered. If this interface is to be installed later, the card can be mounted

on the rear panel of the unit using L-clamp provided on the card itself & following

cards &cables shall be provided along.

Cards:

♦ISO_RS232_CONV-1103

♦VSP-FP-DAC-1003

Cables:

♦3 PIN serial communication (Tx, Rx) data cable (J10) on ISO_RS232_CONV-1103

♦+10V supply cable to be connected on 3 PIN connector (J3) on ISO_RS232_CONV-1103

Following is the procedure to install the card. :

♦Release the TOP COVER of the unit by unscrewing 6 screws at the top & 6 screws at

the side panel of the unit.

♦Remove the TOP COVER (upper plate) of the unit by sliding it out.

♦You will see a number of cards inside the unit. Please do not touch any of these.

♦Remove the existing communication card / Connector, which is connected to the slot at

the back of the unit marked as ‘DIGITAL INTF’.

♦Fit the card “ISO_RS232_CONV-1103” on the rear panel of the unit using L-clamp pro-

vided on the card itself.

♦Check if the link at JP1 is open

♦Initially disconnect the 26-pin cable from J4 on “VSP-DPM CONT1003” card.

♦Insert the card “VSP-FP-DAC-1003” onto the “VSP-DPM CONT-1003” such that 16-pin

DIL female (J3) & 26-pin DIL female (J1) on “VSP-FP-DAC-1003” are plugged in 16-pin

DIL male (J7) & 26-pin DIL male (J4) on the “VSP-DPM CONT-1003” card respectively.

♦Now connect the 26-pin flat cable, which was removed from J4 on “VSP-DPM CONT-

1003” to the 26-pin DIL male (J2) on “VSP-FP-DAC-1003” card. So now the 26-pin DIL

male (J1) on “VSP-POT-IMON-0703 “is connected to 26-pin DIL male (J2) on “VSP-FP-

DAC-1003” card.

♦Do not change the connection between 26-pin DIL male (J2) on “VSP- POT-IMON-0703 “

& 26-pin DIL male (J6) of “VSPDDC-1.2KW-1003D”

♦Connect 3-pin SIL connector (J3) on “VSP-POT-IMON-0703“ to the 3-pin SIL connector

(J2) on “ISO_RS232_CONV-1103” card, which is connected to the switch on rear panel,

which decides to select either remote or RS 232 interface.

♦Two connectors are connected to 4-pin SIL connector (J2) on the “VSPDDC-1.2KW-

1003D” one of which is 4-pin SIL connector (J4) on “VSP-POT-IMON-0703“ & other is 3-

pin SIL connector (J3) on “ISO_RS232_CONV-1103” card

♦Using 3-pin SIL connector connect J10 of on the “ISO_RS232_CONV-1103” card with J10

on “VSP-DPM CONT-1003” card, which are the Transmit & receive signals along with

common ground signal.

♦Verify the signal connections again & select RS232 Interface using slide switch provided

on rear panel.

♦Turn on the unit & test its functionality. Replace the TOP COVER and close the instru-

ment.

6.3.4 RS232 Commands

Following section deals with the commands set for RS232 interface.

It specifies the syntax of each command, which reads the status of power supply or

configures it to the requirements of users.

NOTE: The command uses following notations

<SP> = Indicates Null or space character (20H)

<AARD> = Indicates Arbitrary ASCII Response Data

<NR.DATA> = Indicates Numeric Data

<EOS> = Indicates End of string character (ODH)

1. Command : READ? <EOS>

Description: Read Output Voltage and Current Query.

Function: This command reads back the output voltage & current of the unit in

<AARD> format. The units for Voltage and Current are VOLTS and AMPS respec-

tively. If the unit is in CV (Constant Voltage) or in CC (Constant Current) mode of

operation, this status is also indicated on console. The entire response is terminated

with <EOS> byte.

For example if the Query sent is

READ? <EOS>

Then the response can be as follows:

+14.99V 00.02A CV<EOS> or +14.00V 10.00A CC<EOS>

2. Command : VOLT<SP><NR.DATA><EOS>

Description: Set the Output Voltage for that Channel(s).

Function: This command sets the Output Voltage of the Power Supply output with

the <NR.DATA> given in the command in Volts. The input VOLTAGE data is in Nu-

meric Data format.

For example to set 10.5 Volts then send the command as

VOLT 10.50<EOS>

3. Command : CURR<SP><NR.DATA><EOS>

Description: Set the Output Current Limit for that Channel(s).

Function: This command sets the Output Current of the Power Supply output with

the <NR.DATA> given in the command in AMPS. The input CURRENT data is in

Numeric Data format.

For example to set 2.3 Amps send the command as

CURR 02.30<EOS>

4. Command: VOLT: PROT<SP><NR.DATA><EOS>

Description: Set Over Voltage Protection Limit of OUTPUT

Function: This command sets the Over Voltage Protection Limit of the Power Supply

output with the <NR.DATA> given in the command in Volts. The input VOLTAGE data

is in Numeric Data format. Once this OVP limit is set, any time if the actual Output

Voltage of the channel exceeds the OVP limit, the OUTPUT will be ‘TRIPed’. I.e. the

OVP operates to protect the output and the O/P voltage will be made zero and the

OUTPUT ON/OFF relay will be switched OFF.

For example to set OVP of 31.50 V for output, send the command as

VOLT: PROT 31.50<EOS>

5. Command : OUTP<SP>ON<EOS>

Description: Turn ON the output of power supply.

Function: This command is used to make the OUTPUT available at the output

terminals.

6. Command : OUTP<SP>OFF<EOS>

Description: Turn OFF the output of power supply.

Function: This command is used to switch OFF the output & thus to make the

OUTPUT zero at the output terminals.

7. Command : SYST: REM<EOS>

Description: Takes the instrument into Remote Mode of operation

Function: This command will explicitly take the unit to remote mode. All the front

panel controls are disabled.

8. Command : SYST: LOC<EOS>

Description: Take the instrument to Local mode of Operation.

Function: This command will take the unit to Local mode of operation & ALL the front

panel controls are enabled.

9. Command : STAT? <EOS>

Description: Read Status Query.

Function: This command reads the status of various events occurred in the

system. The definition of events is given below

B0: Over voltage Trip

B1: Over Temperature Trip

B2: Power On event (Sets when unit is turn ON. The bit gets cleared after the

quarry.)

B3: Internal Failure

B4: Always 1 (THIS STATUS BIT MAY BE CHANGED IN FUTURE)

B5: Always 1 (THIS STATUS BIT MAY BE CHANGED IN FUTURE)

B6: Command Error (Sets if invalid command received by unit. The bit gets

cleared after the quarry.)

B7: Always 0

The response to the quarry is single character followed by EOS.

For example after power On condition the response to the quarry

STAT?

Will be

4<EOS>. If Over voltage trip condition occurs then the response will be

1<EOS>.

6.4 IEEE-488 OPERATION:

The IEEE-488 (GPIB) interface option allows the instrument to connect and

form part of an Automated Test System. The instruments are instructed over a

Parallel Data Bus, so that their facilities can be selected remotely. The ADDRESS

concept, Parallel Data Bus and Handshaking are the main advantages over the

RS23C interface, by which at a time more than one instrument (up to 31 instru-

ments) can be connected on the IEEE-488 bus and only the Addressed instrument

can be made to LISTEN or TALK without losing any data. The communication will

be faster because of parallel data transfer.

The IEEE-488 bus has standard 24 PIN flat cable, in which each line is

dedicated to a special BUS activity. The CONTROLLER can send messages or

receive responses from all or any one instrument by proper BUS activation and

handshaking.

6.4.1 IEEE-488 Interface Configuration

The IEEE-488 Interface is a parallel BUS for Communication in the Program-

mable Instruments. Multiple instruments can be connected on the same BUS and

can be hooked up to a single HOST controller or computer. In order that instruments

from different manufacturers can be built into the same system, it was necessary

that all interfaces be compatible. To ensure this, the interfaces were made to con-

form to a standard specification as detailed in the publication ANSI/IEEE Std. 488-

1978 called ‘IEEE Standard Digital Interface for Programmable Instrumentation’ (And

also to ANSI/IEEE std.488.1-1987) and this came to be known as IEEE-488 or GPIB

Interface.

The following list highlights the salient characteristics of the IEEE-488 Inter-

face:

DATA RATE 1 MB/Sec. MAX.

NO. OF DEVICES 31 MAX.

BUS LENGTH 20 Meters. MAX.

DATA LENGTH 8 BITS / 1 BYTE

6.4.2 IEEE-488 Connector Details

The instrument provides a standard 24 pin GPIB connector (marked as COMM

INTF on the rear panel of the instrument) to connect it with the standard GPIB (IEEE-

488) bus. Refer FIG. 6.3 for connector types definition diagram.

Description of the GPIB Signals is given below.

PIN NO. NAME DESCRIPTION

1 DIO 1 Data Input Output Line 1

2 DIO 2 Data Input Output Line 2

3 DIO 3 Data Input Output Line 3

4 DIO 4 Data Input Output Line 4

5 EOI End or Identify

6 DAVData Valid

7NRFD Not ready for Data

8 NDAC Not Data Accepted

9 IFC Interface Clear

10 SRQ Service Request

11 ATN Attention

12 SHIELD Screening on cable (connected to Instrument

Safety Ground).

13 DIO 5 Data Input Output Line 5

14 DIO 6 Data Input Output Line 6

15 DIO 7 Data Input Output Line 7

16 DIO 8 Data Input Output Line 8

17 REN Remote Enable

18 GND 6 Gnd wire of twisted pair with DAV.

19 GND 7 Gnd wire of twisted pair with NRFD.

20 GND 8 Gnd wire of twisted pair with NDAC.

21 GND 9 Gnd wire of twisted pair with IFC.

22 GND 10 Gnd wire of twisted pair with SRQ.

23 GND 11Gnd wire of twisted pair with ATN.

24 LOGIC GND Instrument Logic Ground.

TABLE 6.1

6.4.3 IEEE-488 Operational Sequence Guidelines

Most interface communication tasks require a sequence of coded mes-

sages to be sent over the interface. It is recommended that a careful study of

the available controller capabilities be made many of them assigning one

programming instruction to these sequences. Different controllers will not

necessarily have identical sequences or program instructions.

The following sequences are recommendations only.

DATA TRANSFER

ATN DATA FUNCTION

1UNL Inhibits all current listeners

1(LAD) 1Each address sent enables a specific device re

ceives future data bytes

1(LAD) n More than one address may be sent if multiple listeners

desired.

0(TAD) The address sent enables a specific device to send data

0(DAB) Data bytes sent by currently enabled talker to all currently

enabled listeners.

1UNT Disables the talker on receipt of last character.

UNL =Unlisten

LAD =Listen address of specific device

TAD =Talk address of specific device

DAB =Data bytes

UNT =Untalk

SERIAL POLL

ATN DATA FUNCTION

1UNL Prevents other devices listening to status sent

1SPE Puts interface into serial poll mode during which all

devices send status instead of data when addressed.

1(LAD) n More than one address may be sent if multiple listeners

desired.

0(TAD)n Enable a specific device to send status.

Within these loop devices should be sequentially enabled.

1SBN

or SBA Status byte sent by enabled device. If SBN sent, loop

should be repeated. If SBA sent, the enabled device

is identified as having sent SRQ over the Interface

and will automatically remove it.

1SPD Disables Serial Poll mode

1UNT Disable Last Talker.

UNL =Unlisten

SPE =Serial Poll Enable

SPD =Serial Poll Disable

SBN =Status Byte Negative, where BIT 6 = 0 (BIT 7 is the MSB)

SBA =Status Byte Affirmative, where BIT 6 = 1 (BIT 7 is the MSB)

6.4.4 Installation procedure for GPIB interface option in the VSP series power

Refer to the general assembly layout of the VSP series power supplies. In the

standard units RS232 interface is provided by default. Accordingly, at the location no.

12 the RS232 interface card (ISO-RS232 CONV-0304A) is installed. Also the control

card required for GPIB option (SBC-IEB-0504A) is not installed at location no. 18. The

connectors required for its control supply are secured on the spacers provided for

mounting.

The GPIB installation kit contains the following cards and the cables.

1)GPIB control card: SBC-IEB-0504A – 1 No.

2)GPIB interface card: INSTR- TO – GPIB – 1188

3)26 pin FRC cables: 2 no.

4)16 in FRC cable: 2 no.

Following procedure should be followed for the GPIB option installation:

1) Remove the top cover of the unit in which the GPIB option needs to be installed by

unscrewing the mounting screws. (3 screws on each side and 6 screws on the top)

Please do not remove the screw provided for the top cover earthing on the rear top of

the cover. Remove the spade connector provided for top cover earth connection, after

removing the cover to take it out.

2) Refer to general assembly drawing for the detailed description of the cards inside the

unit.

3) Remove RS232 interface card (ISO-RS232 CONV-0304A) at the location no.12. (2

screws from the rear panel and one from the top)

4) Remove VSP-DAC-CONV-0604A, at the location no. 20 by removing the ‘L’ type

clamp provided in the new version units or by removing the cable tie in the old version

unit.

5) For serial interface (RS232), the micro-controller on the front panel control board is

served as the main controller accordingly it is flash programmed. For GPIB option, the

SBC – IEB –0504A card has an EPROM with the main program burned in. The con-

troller on the front panel control board is served as slave controller for displaying the

control parameters. Accordingly, it needs to reprogram for the same. Please follow the

procedure for reprogramming.

6) Reprogramming of front panel control PCB for GPIB option:

a) Make sure that the folder named msp_vsp_gpib exists in the pc where the IAR

embedded workbench is installed.

b) Connect the JTAG connector to J1 of VSP-DPM-CONT-1204D (location no. 9).

Please make sure that pin no. 1 of female connector (16 pin) corresponds to

pin no. 1 of male connector (14 pin).

c) Run IAR embedded workbench.

d) Open the project named VSP_INTG from the msp_vsp_gpib folder.

e) Select the correct path for GEN.xcl (d:msp_vsp-gpib\gen.xcl).

i) Press the RESET button in the window and exit from CSPY.

j) Turn OFF the unit & remove JTAG connector. This will complete the software

installation for GPIB option.

7) Again turn the unit ON & confirm the polarity of the supplies on the supply connector

provided for GPIB option. (At 3 pin connector connected to J7 of SBC-IEB-0504A, Pin

no. 1 is + ve, pin no. 2 is common and pin no. 3 is –Ve supply. The Voltage is approxi-

mately 10 Volts. At 4-pin connector connected to J5 of SBC-IEB-0504A, Pin no. 1 is +

ve and pin no. 4 is –Ve supply. The Voltage is approximately 10 Volts. ) Turn The unit

OFF.

8) For the GPIB option, there is provision of the jumper links on the VSP-DPM-CONT-

1204D for the hardware correction. Remove JP6 near IC U4 (This will disconnect the

+5V supply presently sourced from display board).

9) Remove jumpers JP2, JP3, JP4 & JP5. (This will isolate CV, CC, OVP and OT sig-

nals from connector J4)

10) Install jumper JP1 for GPIB mode. (By default, this jumper is open and need to install

in GPIB option).

11) Mount the INSTR-TO-GPIB-1188 pcb on the location 12 with the rear 2 screws.

12) Before mounting the SBC-IEB-0504A pcb make sure that FRC connectors provided

for interconnection are placed according to following table. Also place the insulation

paper below the pcb & route the cables below the pcb.

13)

Sr. No. Cable Type Connector No. on To

SBC-IEB-0504A

PCB

01 26 Pin FRC (Long) J6 J1 of INSTR-TO-GPIB-1188

02 26 Pin FRC J8 J1 of VSP-POT-IMON-0604A

(Location no. 19)

03 16 Pin FRC J2 J7 of VSP-DPM-CONT-1204D

04 16 Pin FRC J3 J5 of VSP-DPM-CONT-1204D

05 3 Pin SIL J7 Existing in the unit wired for GPIB

option.

06 4 Pin SIL J5 Existing in the unit wired for GPIB

option.

14) Please make sure that the pin no. 1 of all the connectors are properly installed to the

pin no 1 of destination connector.

15) Now the unit is set for GPIB option. Turn the unit ON with ‘Line’ switch. Display will

show the blank digits for a while and after a small delay it is ready to work in the

LOCAL mode of operation.

16) Check the GPIB interface with the standard available PCI-GPIB interface software.

Turn the unit OFF.

17)Now reconnect the earth connection to the top cover & reinstall the top cover. This will

complete the installation of GPIB interface.

f) Compile the project.

g) Connect line input to the unit. Keep the front panel output ON/OFF switch in

OFF position. Turn the unit on with the input ‘Line’ switch.

h) Run CSPY to download program in flash memory of the controller.

6.4.5 IEEE-488 Instrument Address Selection

The instrument address is set manually using an eight way miniature

switch near the interface connector on the rear panel. This DIP switch is nor-

mally marked with A0 to A7 to identify the proper switch. In our system, we refer

A0 as switch 1 and an A7 as switch 8. The OPEN (OFF) condition of the

switches will simulate logic 1 and CLOSE (ON) condition will simulate logic 0.

These states are marked on the panel as ON (0) and OFF (1).

Five of the switches (A0 to A4) are used to set the address using the

binary code. This enables any address in the range 00 (00 HEX) to 31 (1F

HEX) to be used. E.g. 11010 is address 26 (1A HEX).

The switch no A5 is not used. The remaining two switches (A6, A7) are

used to say whether the installed IEEE-488 Interface card has to be honored or

not. In easy terms, if switches A6 and A7 are CLOSED (ON) simultaneously, the

installed IEEE-488 Interface card is ENABLED. If switches A6 and A7 are not

simultaneously CLOSED (ON), then the IEEE-488 Interface card will be DIS-

ABLED even if the address is set properly.

NOTE:

THE CONFIGURATION OF IEEE-488 INTERFACE CARD AND THE ADDRESS

SETTING OF THE INSTRUMENT HAS TO BE DONE BEFORE THE INSTRUMENT

IS SWITCHED ON. AFTER POWER ON, CHANGING OF THE SWITCH SETTINGS

ON THE IEEE-488 INTERFACE CARD WILL NOT HAVE ANY EFFECT ON RE-

MOTE OPERATION OF THE INSTRUMENT.

Remove JP2,JP3, JP4 & JP5 From J3 of SBC-IEB

Install JP1 From J2

Remove Jumper Link here.

VSP-DPM-CONT

To J7 To J5 To J1 of VSP-POT-IMON

To J1 of INSTR-TO-GPIB

ADDRESS SWITCHES

SWITCHES 5-BIT DECIMAL HEX CODE

CODE

A4 A3 A2 A1 A0

0 0 0 0 0 00 00

0 0 0 0 1 01 01

0 0 0 1 0 02 02

0 0 0 1 1 03 03

0 0 1 0 0 04 04

0 0 1 0 1 05 05

0 0 1 1 0 06 06

0 0 1 1 1 07 07

0 1 0 0 0 08 08

0 1 0 0 1 09 09

0 1 0 1 0 10 0A

0 1 0 1 1 11 0B

0 1 1 0 0 12 0C

0 1 1 0 1 13 0D

0 1 1 1 0 14 0E

0 1 1 1 1 15 0F

1 0 0 0 0 16 10

1 0 0 0 1 17 11

1 0 0 1 0 18 12

1 0 0 1 1 19 13

1 0 1 0 0 20 14

1 0 1 0 1 21 15

1 0 1 1 0 22 16

1 0 1 1 1 23 17

1 1 0 0 0 24 18

1 1 0 0 1 25 19

1 1 0 1 0 26 1A

1 1 0 1 1 27 1B

1 1 1 0 0 28 1C

1 1 1 0 1 29 1D

1 1 1 1 0 30 1E

TABLE 6.2

The Other three switches (A7 A6 A5) must be kept to 000 (ON, ON, ON).

6.4.6 Special Notes For the Controller Software Writer

This section will provide some valuable hints to the controller software program

writer for interfacing this Programmable Unit, through the communication interface.

1). Normal communication is in ASCII. The unit will accept both the lower case and

upper case characters.

2). All commands for the units are in the IEEE-488.2 and SCPI format.

3). All mandatory commands for IEEE-488.2 are implemented in the unit.

4). Also the command has to be sent with proper terminator (The Program Mes-

sage Terminator is either = 0AH (NEWLINE) OR EOI message OR both of the

above). Else the command processing will not start.

5). For the responses of query commands, the Response Message Terminator or

EOS character will be OAH (New Line) character.

6). For all commands <AARD> means Arbitrary ASCII Response Data and

<NR.DATA> means Numeric Data.

7). For wrong commands, the command error bit will be set & an error message is

put into Error Queue.

8). Unit will go to remote mode for all valid commands. Queries will not force the unit

into remote mode.

9). The GPIB ‘GTL’ command will send the unit into Local mode.

10). IEEE-488 device clear commands ‘SDC’ & ‘DCL’ will generate a communication

soft reset to the unit. Present communication buffer will be flashed out. But, the

unit will maintain the last settings.

11). When the unit has received MLA (My Listen Address) with REN line true, it will go

to remote mode as per the RL2 function requirements.

12). The unit provides complete SRQ function. Refer section 5.10 for details. When

the controller polls the SRQ response byte, it is found in case of some control-

lers that this response byte gets latched in the controllers data in buffer causing

an extra character while reading the next message through GPIB. So, it is advis-

able to give a dummy listen to the controller GPIB controller chip with sufficient

time-out to flash out such character if pending any.

13). Before sending the unit into talk mode it is also advisable to

Flush out the controller’s data-in buffer by giving a dummy read. This is required

because some controller can keep the last data latched into its data-in Buffer.

14). If you send more than one query in a <PROGRAM MESSAGE>, only the LAST

correct query will be processed and response will be given for last query.

15). No response can be read without giving a query. Otherwise the query error bit will

be set & an error message is generated.

6.5 An Introduction to SCPI Language

Standard Commands for Programmable Instruments (SCPI) defines how you

communicate with an instrument from a BUS controller. The SCPI language uses a

hierarchical structure similar to the file systems used by many bus controllers. The

command “TREE” is organized with root-level commands (also called “SUB-

SYSTEMS”) positioned at the top, with multiple levels below each root level com-

mand. You must specify the complete path to execute the individual lower-level

commands.

USING A COLON (:)

When a colon is the first character of a command keyword, it indicates that the

next command mnemonic is a root-level command. When a colon is inserted be-

tween two-command mnemonics, the colon moves the path down one level in the

present path (for the specified root-level command) of the command tree. You must

separate the command mnemonics from each other using a colon. You can OMIT

the leading COLON if the command is the first of a new program line.

USING A SEMICOLON (;)

Use a semicolon to separate two commands within the same command

string. The semicolon does not change the present path specified. For example the

following two statements are equivalent.

: SOURce:VOLTage 10.55:SOURce:CURRent 2.50

: SOURce: VOLTage 10.55;CURRent 2.50

USING A COMMA (,)

If a command requires more than one parameter, you must separate the

adjacent parameters using a comma.

USING WHITESPACE

You must use Whitespace characters, [tab], or [space] to separate a param-

eter from a command keyword. Whitespace characters are generally ignored only in

parameter lists.

USING “?” COMMANDS

The BUS controller may send commands at any time, but an SCPI instrument

may only send responses when specifically instructed to do so. Only QUERY com

mands (commands that end with a “?”) will instruct the instrument to send a response

message. Queries return either measured values or internal instrument settings or

some ERROR messages.

CAUTION

IF YOU SEND MORE THAN ONE QUERY COMMAND WITHOUT READING

THE RESPONSE FROM THE EARLIER ONES, AND THEN ATTEMPT TO READ

THE RESPONSE FROM THE LAST QUERY, YOU MAY OR MAY NOT RECEIVE

SOME DATA FROM THE EARLIER RESPONSES. BUT YOU WILL RECEIVE

COMPLETRESPONSE FOR THE LAST QUERY. TO AVOID THIS DO NOT SEND A

NEXTQUERY COMMAND BEFORE READING THE RESPONSE FROM THE FIRST

ONE.

USING “*” COMMANDS

Commands starting with a “*” are called Common Commands (Mandatory

commands for IEEE-488.2). They are required to perform the identical function for all

instruments that are compliant with the IEEE-488.2 Interface Standard. The “*”

Commands are used to control reset, Self-Test and status operation and reporting in

the present instrument.

6.5.1 SCPI Data Types

The SCPI language defines the different data formats for use in program

messages and response messages. Instrument is flexible listeners and can accept

commands and parameters in various formats. However, SCPI instruments are

PRECISE talkers. This means that the SCPI instruments will always respond to a

particular query in a predefined, rigid format.

NUMERIC PARAMETERS:

Commands that require numeric parameters will accept all commonly used

decimal representations of numbers including optional signs, decimal points and

scientificnotation. Special values for numeric parameters like MAXimum, MINimum

and DEFault are also accepted. You can also send engineering unit suffixes (M, k, or

u) with numeric parameters. If only specific numeric values are accepted, the

instrument will automatically round the input numeric parameters.

DISCRETE PARAMETERS:

Discrete parameters are used to program settings that have a limited number

of values (like BUS, EXTernal, NORmal, and INVerted). They have a short forms and

a long form just like command keywords. You can mix upper case and lower-case

letters. Query responses will always return the short form in upper-case letters.

BOOLEAN PARAMETERS:

Boolean Parameters represent a single binary condition that is either TRUE or

FALSE. For a false condition the instrument will accept “OFF” or “0”. For a true

condition this instrument will accept “ON” or “1”. When you query a Boolean setting,

the instrument will always return a “0” or “1”.

STRING PARAMETERS:

String Parameters can contain virtually any set of ASCII characters. A STRING

must begin and end with matching quotes, either with a single

Quote or with a double quote. You can include the quote delimiter as part of the

string by typing it twice without any characters in between.

6.5.2 Input Message Terminators

Program Messages sent to an SCPI instrument must terminate with a <

NEWLINE > character. The IEEE-488 EOI (END OR IDENTITY) signal is interpreted

as a < NEWLINE > character and may also be used to terminate a message in

place of the < NEWLINE > character. Many programming languages allow you to

specify a message terminator character or EOI state to be automatically sent with

each BUS transaction. Message termination will always set the current path back to

the root-level.

6.5.3 SCPI Goals

The goal of Standard Commands for Programmable Instruments (SCPI) is to

reduce Automatic Test Equipment (ATE) program development time. SCPI accom-

plishes this goal by providing a consistent programming environment for instrument

control and data usage. This consistent

Programming environment is achieved by the use of defined program mes-

sages, instrument responses and data formats across all SCPI instruments, regard-

less of manufacturer.

The advantage of SCPI for the ATE system programmer is reducing the time

learning how to program new SCPI instruments after programming their first SCPI

instrument.

By providing a consistent programming environment, replacing one SCPI

instrument with another SCPI instrument in an ATE system will usually require less

effort than with non-SCPI instruments.

6.5.4 SCPI Status Model

All SCPI instruments implement status registers in the same way. The status

system records various instrument conditions in three register groups:

The Status Byte register

The Standard Event register and

The Questionable Data register.

The status byte register records high level summary information reported in the

other register groups.

The diagram on the next page illustrates the SCPI status system.

Event Registers:

The standard and the questionable data registers have event registers. An

event register is a read-only register that reports defined conditions within the instru-

ment. Bits in the event registers are latched. Once an event bit is set, subsequent

state changes are ignored. Bits in an event register are automatically cleared by a

query of that register (such as *ESR? or STAT: QUES: EVEN?) or by sending the

*CLS (clear status) command. A reset (*RST) or device clear will not clear bits in

event registers. Querying an event register returns a decimal value, which corre-

sponds, to the binary weighted sum of all bits set in that register.

Enable Registers:

An enable register defines which bits in the corresponding event register are

logically Ored together to form a single summary bit. Enable registers are both

readable and writable. The *CLS (clear status) command does not clear enable

registers but it does clear the bits in the event registers. The STATus:PRESet com-

mand will clear the questionable data enable register. Querying an enable register

will not clear it. To enable bits in an enable register, you must write a decimal value,

which corresponds, to the binary weighted sum of bits you wish to enable in a

SCPI STATUS SYSTEM

The Status Byte Register

The status byte summary register reports conditions from other status

registers.Query data that is waiting in the instrument’s output buffer is immediately reported

through the “message available” bit (bit 4). Bits in the summary registers are not latched.

Clearing an event register will clear the corresponding bits in the status byte summary

the message available bit.

BIT DEFINITIONS-STATUS BYTE REGISTER

BIT DESCRIPTION DECIMAL

VALUE DEFINITION

0Not Used 1Always set to 0.

1Not Used 2Always set to 0.

2Questionable Data 4One or more bits are set in the Questionable

Data register (bits must be “enabled” in enable

3Not Used 8Always set to 0.

4Message Available 16 Data is available in the Instrument’s output

buffer.

5Standard Event 32 One or more bits are Set in the Standard Event

6Request Service 64 The Instrument is requesting the SERVICE

(Serial Poll).

7Not Used 128 Always set to 0.

The Status byte summary register is cleared when:

♦You execute a * CLS (clear status) command.

♦Querying the standard event and questionable data registers will clear only the respective

bits in the summary register.

The status byte enable register (request service) is cleared when:

* You turn on the power to the instrument.

* You execute a *SRE 0 command.

USING *STB? TO READ THE STATUS BYTE

The *STB? (Status byte query) command is similar to a serial poll except it is pro-

cessed like any other instrument command. The *STB? Command returns the same result

as an IEEE-488 serial poll except that the “request service” bit (bit 6) is not cleared if a serial

poll has occurred. The *STB? Command is not handled automatically by the IEEE-488 bus

interface hardware and the command will be executed only after previous commands have

completed. Polling is not possible using the *STB? Command. Using the *STB? Command

does not clear the status byte summary register.

TO INTERRUPT YOUR BUS CONTROLLER USING SRQ

* Send a bus device clear message.

* Clear the event registers with the *CLS (clear status) command.

* Set the *ESE (standard event register) & *SRE (status byte register) enable

masks.

* Send the *OPC? (Operation complete query) command and enter the result to

assure synchronization.

* Enable your bus controller’s IEEE-488 SRQ interrupt.

TO DETERMINE WHEN A COMMAND SEQUENCE IS COMPLETED.

* Send a device clear message to clear the instrument’s output buffer.

* Clear the event registers with the *CLS (clear status) command

* Enable “operation complete” using the *ESE 1 command (standard event regis-

ter)

* Send the *OPC? (Operation complete query) command and enter the result to

assure synchronization.

* Send your programming command string and place the *OPC

(Operation complete) command as the last command.

* Use a serial poll to check to see when bit 5 (standard event) is set in the status

byte summary register. You could also configure the instrument for an SRQ

interrupt by sending *SRE 32 (status byte enable register, bit 5).

HOW TO USE THE MESSAGE AVAILABLE BIT (MAV)

You can use the status byte “message available” bit (bit 4) to determine when

data becomes available to read into your bus controller. The instrument sets bits 4

when the first reading becomes ready (which can be READ?). The instrument subse-

quently clears bit 4 only after all messages have been read from the output buffer.

The message available (MAV) bit can only indicate when first reading is available

following a READ? Or following a *TST? Query command. This can be helpful be-

cause you do not know when the Self-Test will be completed after the *TST? Com-

mand is given.

THE STANDARD EVENT REGISTER

The standard event register reports the following types of instrument events:

power-on detected, command syntax errors, command execution errors, self-test or

calibrationerrors, query errors, or when an *OPC command is executed. Any or all of

these conditions can be reported in the standard event summary bit through the

enable register. You must write a decimal value using the *ESE (event status enable)

command to set the enable register mask.

Note: An error condition (standard event register bits 2,3,4 or 5) will always record one or

more errors in the instrument’s error queue. Read the error queue using SYSTem: ERRor?

The standard event register is cleared when:

* You send a *CLS (clear status) command.

* You query the event register using the *ESR? (Event status register) command.

The standard event enable register is cleared when:

*You turn on the power to the instrument.

*You execute a *ESE 0 command.

BIT DEFINITIONS-STANDARD EVENT REGISTER

BIT DESCRIPTION DECIMAL

VALUE DEFINITION

0Operation Complete 1All commands prior to and including an *OPC

command have been executed.

1Not Used 2The instrument tried to read the output buffer but

it was empty. Or a new command line was

received before a previous query has been read.

Or, both the input and output buffers are full.

2Query Error 4The controller tried to read the O/P buffer of the

instrument without giving the Query first or

wrong Channel list was supplied in query.

3Device Error 8A Self-Test, Calibration Or Channel TRIP error

occurred.

4Execution Error 16 An execution error occurred.

5Command Error 32 A command syntax error has occurred.

6Not Used 64 Always set to 0.

7Power On 128 Power has been turned off and on since the last

time the event register was read or cleared.

THE QUESTIONABLE DATA REGISTER

The Questionable Data Register provides information about the FAULTS on the

different CHANNELS of the Source unit. When a CHANNEL TRIP occurs the reason as to

what caused the TRIP on that CHANNEL could be obtained from this register. The CHANNEL

can have Over Voltage trip or Over Current trip or Over Temperature trip. Any or all of these

conditions can be reported in the questionable data summary bit through the enable register.

You must write a decimal value to enable that particular event using the command STATus:

QUEStionable: ENABle < DATA >

BIT DEFINITIONS-QUESTIONABLE DATA REGISTER

BIT DESCRIPTION DECIMAL

VALUE DEFINITION

0OVP trip 1Channel 1 Over Voltage Trip

2OT trip 4Channel 1 Over Temperature Trip

3OVP trip 8Channel 2 Over Voltage Trip

5OT trip 32 Channel 2 Over Temperature Trip

6Not Used 64 Always Set to 0

7Not Used 128 Always Set to 0

8OVP trip 256 Channel 3 Over Voltage Trip

10 OT trip 1024 Channel 3 Over Temperature Trip

11 OVP trip 2048 Channel 4 Over Voltage Trip

13 OT trip 8192 Channel 4 Over Temperature Trip

14 Not Used 16384 Always Set to 0

15 Not Used 32768 Always Set to 0

The questionable data event register is cleared when:

* You execute a *CLS (clear status) command.

* You query the event register using STATus: QUEStionable: EVENt?

The questionable data enable register is cleared when:

* You turn on the power to the instrument.

* You execute the STATus: PRESet command

* You execute the STATus: QUEStionable: ENABle 0 command.

6.6 COMMAND SUMMARY

This section summarizes the SCPI commands available for this Programmable

Instrument. Refer to the later sections in this chapter for more complete details on each

command.

Throughout this manual, the following conventions are used for SCPI command

syntax. Square brackets ([ ]) indicate optional keywords or parameters. Braces ({})

enclose parameters within a command string. Triangle brackets (< >) indicate that

you must substitute a value for the enclosed parameter.

SR NO. IEEE-488.2 COMMON COMMANDS

1*CLS

2*ESE<SP><NR.DATA>

3*ESE?

4*ESR?

5*IDN?

6*OPC

7*OPC?

8*RST

9*SRE<SP><NR. DATA>

10 *SRE?

11 *STB?

12 *TST?

13 *WAI

SR NO. STATUS REPORTING COMMANDS

1SYSTem: ERRor?

2STATus: QUEStionable: EVENt?

3STATus: QUEStionable: ENABle?

4STATus: QUEStionable: CONDition?

5STATus :QUEStionable:ENABle<SP><NR.DATA>

6STATus: OPERation: EVENt?

7STATus: OPERation: ENABle?

8STATus: OPERation: CONDition?

9STATus:OPERation:ENABle<SP><NR.DATA>

10 STATus:PRESet

11 *CLS

12 *ESE<SP><NR.DATA>

13 *ESE?

14 *ESR?

15 *OPC

16 *OPC?

17 *SRE<SP><NR.DATA>

18 *SRE?

SR NO. SYSTEM RELATED COMMANDS

1READ?

2[SOURce:] VOLTage<SP><NR.DATA><Channel_list>

3[SOURce:] CURRent<SP><NR.DATA> <Channel_list>

4[SOURce:] VOLTage:LIMit<SP><NR.DATA><Channel_list>

5[SOURce:] VOLTage:PROTection<SP><NR.DATA>

6<Channel_list>

7OUTPut[:STATe]<SP>ON<Channel_list>

8OUTPut[:STATe]<SP>OFF<Channel_list>

NOTE:

<SP> = Null or space character (20H)

<AARD> = Arbitrary ASCII Response Data

<NR.DATA> = Numeric Data

<EOS> = End of string character (OAH)

<Channel_list> = Channel Number operation.

The format for giving the channel list is

(@1) : Channel number 1

(@1,2) : Channel nos. 1 & 2.

(@1,2:4) : Channel numbers 1,2,3,4.

Brackets are compulsory.

6.6.1 SPECIAL NOTES ON THE COMMANDS FOR VSP SERIES:

1). All commands for the unit are in the IEEE-488.2 and SCPI format.

2). All mandatory commands for IEEE-488.2 are implemented in unit.

3). Also the command has to be sent with proper terminator. Else the command

processing will not start.

4). For the responses of query commands, the Response Message Terminator or

EOS character will be OAH (New Line) character.

5). For all commands <AARD> means Arbitrary ASCII Response Data and

<NR.DATA> means Numeric Data.

6). For wrong commands, the command error bit will be set & an error message is

put into Error Queue.

7). Unit will go to remote mode for all valid commands. Queries will not force the unit

into remote mode.

8). If you send more than one query in a <PROGRAM MESSAGE>, only the LAST

correct query will be processed and response will be given for last query.

9). The Channel list in the command is optional for single channel power supply.

10). No response can be read without first giving a query. Otherwise the query

error bit will be set & an error message is generated.

11). The local lockout can be set when the instrument is in remote mode of operation.

12). The address of the IEEE-488 interface is default set to 0.

6.7 MANDATORY COMMANDS

This section explains in detail the IEEE-488.2 and SCPI MANDATORY common

commands, which are supported by this Programmable Instrument.

NOTE:

<SP> = Null or space character (20H)

<AARD> = Arbitrary ASCII Response Data

<NR.DATA> = Numeric Data

<EOS> = End of string character (OAH)

<Channel_list> = Channel Number operation.

The format for giving the channel list is

(@1) : Channel number 1

(@1,2) : Channel nos. 1 & 2.

(@1,2:4) : Channel numbers 1,2,3,4.

Brackets are compulsory.

1. Command :*CLS

Description :Clear Status command

Function : This will clear status Data Structure & forces the Instru-

ment to OCIS and OQIS state.

2. Command :*ESE<SP><NR.DATA>

Description :Standard Event Status Enable command.

Function : This <NR.DATA> is from 0-255 & will set or reset the bits

of Standard Event Status Enable Register.

3. Command :*ESE?

Description :Standard Event Status Enable Query

Function : This query command reads the contents of Stan

dard Event Status Enable register in < NR.DATA>(0-

255) data format.

4. Command :*ESR?

Description : Standard Event Status Register Query

Function : This query command reads the contents of the Stan-

dard Event Status Register in <NR.DATA> Numeric Data

(0-255) format.

5. Command :*IDN?

Description :Identification Query

Function : This query command will read back the specific informa-

tion about device. There are 4 fields in the response sepa-

rated by commas.

Field 1: Manufacturer (DEL)

Field 2: Model number (XXXXXXX)

Field 3: Serial number (0 if not available)

Field 4: Version number (XX.YY)

6. Command :*OPC

Description :Operation complete command

Function : This command tells the device to generate the operation

complete message in the Standard Event register when

all the pending selected device operations have been com-

pleted.

7. Command :*OPC?

Description :Operation Complete Query

Function : When this query is sent if the <NR.DATA> response re-

ceived is ‘1’, then it implies that the device has completed

all pending operations.

8. Command :*RST

Description :Reset Command

Function : This Reset command performs a Device reset & forces

the device into OCIS state & OQIS state and sets the de-

vice specific functions to a known state. (Please refer to

section 5.7.1 for the Details of *RST Conditions.)

9. Command :*SRE<SP><NR.DATA>

Description :Service Request Enable Command.

Function : This command sets the bits in the Service Request En-

able Register as per the data sent in the <NR.DATA> (0-

255) data format.

10. Command :*SRE?

Description :Service Request Enable Query.

Function : This query command reads back the contents of the Ser-

vice Request Enable Register in the <NR.DATA> Numeric

data format (0-255).

11. Command :*STB?

Description :Read Status Byte Query.

Function : This query command reads back the contents of the Sta-

tus Byte Register in the <NR.DATA> Numeric Data format

ranging from 0-255.

12. Command :*TST?

Description : Self-Test Query.

Function : This query command causes an internal Self Test & re-

ports whether the Test was completed successfully (

<NR.DATA> = 0 ) or detected any of the errors in the Self

Test ( <NR.DATA> = non-zero ), which are discussed in

detail under section 5.11 of this chapter.

NOTE: Before running the Self-Test with the *TST? Command set the OVP and

OCP Limits to maximum. Or else the unit will TRIP.

13. Command :*WAI

Description : Wait to continue command.

Function : This command shall prevent the device from executing

any further commands or readings till the No-operation

pending Flag is set true.

14. Command :SYSTem: ERRor?

Description : System Error condition Query.

Function : This command returns the error number & error descrip-

tion from the error queue of the instrument.

If the ERROR QUEUE is empty, 0,“No error”

will be the response. The error queue can hold up to 6

messages. If the entire buffer is full and an ERROR oc-

curs at this moment then the last message in the Error

Queue will be replaced with -350,”Queue overflow”

When a message is read from the queue using the

SYSTem:ERRor? Query, the first one is cleared and all

the messages are shifted one to the start again.

15. Command :STATus:QUEStionable:EVENt?

Description : Status Questionable Event Register Query.

Function : This query command returns the <NR.DATA> format (0-

32767) value of the Questionable Event Register, (16 bit

ror. After this QUERY reads the register, the contents of

the Status Questionable Data Event Register are cleared.

16. Command : STATus:QUEStionable:ENABle<SP>

<NR.DATA>

Description : Set Enable bits for status Questionable Enable Register.

Function : This command takes <NR.DATA> input & puts the corre-

sponding HEX data to status Questionable Enable Regis-

ter (to enable the corresponding events in Status Ques-

tionable Event Register). Since the enable register is also

a 16-bit register, the <NR.DATA> can be in the 0-32767

range. If the input data is out of range then an “Execution

error” will be generated.

17. Command :STATus:QUEStionable:ENABle?

Description : Read Status Questionable Enable Register Query.

Function : This query command reads the contents of the Status

Questionable Enable Register, in the <NR.DATA> (0-

32767) format, whose corresponding HEX value repre-

sents the bit pattern of the Register.

18. Command : STATus:QUEStionable:CONDition?

Description : Read Status Questionable condition register query.

Function : This query will give the contents of status questionable con-

dition register in <NR.DATA> (0-32767) format, whose HEX

value represents the Bit pattern of the register. This will al-

ways read as ‘0’ (ZERO).

19. Command : STATus:OPERation:EVENt?

Description : Read Status operation Event Register Query.

Function : This query returns the contents of the Status Operation

Event register in <NR.DATA> format (0-32767)

whose 16 Bit HEX value represents the Bit pattern of

20. Command : STATus:OPERation:ENABle<SP>

<NR.DATA>

Description : Set the Enable Bits of status operation Enable Register.

Function : This command takes <NR.DATA> input and puts the

corresponding HEX data to Status Operation Enable

Operation Event Register). Since the enable register

isalso a 16-bit register, the <NR.DATA> can be in the

0- 32767 range. If the input data is out of range then

an “Execution error” will be generated.

21. Command : STATus:OPERation:ENABle?

Description : Read Status Operation Enable Register Query.

Function : This query command reads the contents of the Status Op-

eration Enable Register, in the <NR.DATA> (0-32767) for-

mat, whose corresponding HEX value represents the bit pat-

tern of the Register.

22. Command : STATus:OPERation:CONDition?

Description : Read Status Operation condition register query.

Function : This query will give the contents of Status Operation Condition

represents the Bit pattern of the register. This will always

read as ‘0’ (ZERO).

23. Command : STATus:PRESet

Description : Resets the Enable Bits of Status Operation and Question-

able Enable Register.

Function : This command puts the data as ‘0’ (ZERO) so that corre-

sponding HEX data (00 Hex) will CLEAR the Status Opera-

tion Enable and Status Questionable Enable Registers. (to

disable all the corresponding events in the Status Opera-

tion Event Register and Status Questionable Data Event

6.7.1 *RST Conditions

The following conditions are defined for the PROGRAMMABLE DC POWER

SUPPLY on receiving the *RST command and execute it.

1). The Baud Rate of the instrument for RS232 operation is set to 9600 BAUD,

which is variable through Remote mode commands.

2). The output Voltage, Current, OVP Limit and OCP Limit for all the Channels are

set to the same values as programmed in the Configuration setup, stored in the

EEPROM installed inside the unit.

3). The output ON/OFF relays for all the Programmable Channels are switched to

‘OFF’ position.

6.8 INSTRUMENT (SYSTEM RELATED) COMMANDS

This section explains in detail the Instrument Specific or the System Related

Commands, which are used to Program different parameters of the system. All

commands, except the last two commands (For selecting the Internal or External

SENSE for the output) are SCPI APPROVED commands. But the last two are SCPI

CONFIRMED commands. For this instrument there is NO command, which are not

part of the SCPI definition.

NOTE:

<SP> = Null or space character (20H)

<AARD> = Arbitrary ASCII Response Data

<NR.DATA> = Numeric Data

<EOS> = End of string character (OAH )

<Channel_list> = Channel Number operation.

The format for giving the channel list is

(@1) : Channel number 1

(@1,2) : Channel nos. 1 & 2.

(@1,2:4) : Channel numbers 1,2,3,4.

Brackets are compulsory.

1. Command :READ?<Channel_list>

Description : Read Output Voltage and Current Query.

Function : This command reads back the output voltage & current

of the unit in <AARD> format. The units for Voltage and

Current are VOLTS and AMPS respectively. If the speci-

fied CHANNEL(S) is in CV (Constant Voltage) mode of

operation, no special indication is given. But if it is in CC

(Constant Current) mode of operation then the word ‘CC‘

is put at the end of the response. The entire response is

terminated with <EOS> byte.

Response is in Arbitrary ASCII Response Data format.

<Channel_list> indicates for which all CHANNELS the

DATA has to be read. The responses of two channels

are separated by the RMUS (Response Message Unit

Separator), which is SEMICOLON (;).

The sequence of the Response for more than one chan-

nel is the same as the Sequence of the channel num-

bers specified in the <Channel_list>. If no such

Channel_list> is provided the READ? query will always

read from channel 1.

For example if the Query sent is

READ?(@2,1)

then the response can be as follows:

+14.99V 00.02A;+00.35V 01.99A CC<EOS>

which indicates that CHANNEL 1 is in CC mode.

2. Command :[SOURce:]VOLTage<SP><NR.DATA>

<Channel_list>

Description : Set the Output Voltage for that Channel(s).

Function : This command sets the Output Voltage of the Power Sup-

ply output with the <NR.DATA> given in the command in

Volts. The input VOLTAGE data is in Numeric Data for-

mat. The <Channel_list> above, indicates for which all

CHANNELS the DATA has to be SET. The same data will

be set on all the specified CHANNEL(S). If no such

<Channel_list> is provided the SOURce command will

always SET to channel 1.

For example to set 10.5 Volts on Channel 2, send the

command as:

SOURce:VOLTage 10.50(@2)

For example to set 30 Volts on Channels 1&2,send the

command as: VOLTage 3.00 E+1(@1:2)

3. Command :[SOURce:]CURRent<SP><NR.DATA>

<Channel_list>

Description : Set the Output Current Limit for that Channel(s).

Function : This command sets the Output Current of the Power

Supply output with the <NR.DATA> given in the command

in AMPS. The input CURRENT data is in Numeric Data

format. The <Channel_list> above, indicates for which

all CHANNELS the DATA has to be SET. The same data

will be set on all the specified CHANNEL(S). If no such

<Channel_list> is provided the SOURce command will

always SET to channel 1.

For example to set 2.3 Amps on Channels 1&2 send the

command as:

SOURce: CURRent 2.300 E+0(@1,2)

For example to set 1 Amp on Channel 1 only, send the

command as:

CURR 1

For example to set 1.99 Amps on Channel 2, send the

command as:

SOUR:CURR 199 E-2(@2)

4. Command :[SOURce:]VOLTage:LIMit<SP>

<NR.DATA><Channel_list>

Description : Set the Upper Limit of O/P Voltage for that Channel(s).

Function : This command sets the Soft Upper Limit for Output

Voltage of the specified CHANNEL(S) of the Power

Supply output with the <NR.DATA> given in Volts. The

input VOLTAGE data is in Numeric Data format. The

<Channel_list> above,

indicates for which all CHANNELS the LIMIT has to be SET. The

same data will be set on all the specified CHANNEL(S). Once

this limit is set, from that point onwards the output voltage can

not be set to higher values than this. If you try to set higher value

using SOURce:VOLTage command, the “ Execution error “ will

be generated. At the same time the LIMITS can not be set to a

value, which is more than the MAXimum ratings of the

CHANNEL(S). Also the read value of Voltage is checked with the

Soft Limit Voltage value all the time and if the reading exceeds

the Channel will be TRIPPed, giving the reason for TRIP as S/W

OVP TRIP.

For example to set Limit of 30.80 Volts on Channel 2, send the

command as :

SOURce:VOLTage:LIMit 30.80(@2)

VOLT:LIM 3.08 E+1(@2)

5. Command :[SOURce:]VOLTage:PROTection<SP>

<NR.DATA><Channel_list>

Description : Set Over Voltage Protection Limit for that Channel(s).

Function : This command sets the Over Voltage Protection Limit for that

CHANNEL of the Power Supply output with the <NR.DATA> given

in the command in Volts. The input VOLTAGE data is in Numeric

Data format. The <Channel_list> above, indicates for which all

CHANNELS the OVP has to be SET. The same data will be set

on all the specified CHANNEL(S). If no such <Channel_list> is

provided the PROTection command will always SET to channel

1 OVP. Once this OVP limit is set on a channel, any time if the

actual Output Voltage of the channel exceeds the OVP limit, the

CHANNEL(S) will be ‘TRIPed’. I.e. the OVP operates to protect

the channel and the O/P voltage will be made zero and the OUT-

PUT ON/OFF relay will be switched OFF.

For example to set OVP of 31.50 V on Channel 2, send the com-

mand as :

SOURce:VOLTage:PROTection 31.50(@2)

6. Command :OUTPut[:STATe]<SP>ON <Channel_list>

Description : Set the Output relay to ON state for the specified channels.

Function : This command is used to switch on the output relay & thus to

make the OUTPUT available at the output terminals.

7. Command :OUTPut[:STATe]<SP>OFF<Channel_list>

Description : Set the Output relay to OFF state for the specified channels.

Function : This command is used to switch OFF the output relay & thus to

disconnect the OUTPUT available at the output terminals.

8. Command : SYSTem:REMote

Description : Takes the instrument into Remote Mode of operation

Function : This command will explicitly take the unit to remote mode. All the

front panel controls are disabled. It is advisable to put the unit

into REMOTE mode of operation using this command, before

using the instrument in Remote mode.

9. Command :SYSTem:LOCal

Description : Take the instrument to Local mode of Operation.

Function : This command will take the unit to Local mode of operation &

ALL the front panel controls are enabled.

6.9 IEEE-488 COMPLIANCE INFORMATION

Dedicated Hardware Lines: Universal Commands:

ATN Attention DCL Device Clear

IFC Interface Clear ATN Attention

REN Remote Enable IFC Interface Clear

SRQ Service Request Interrupt LLO Local Lock-Out

Addressed Commands:

SDC Selected Device Clear

END End Message

GTL Go to Local

IEEE-488 INTERFACE COMPATIBILITY :

Although the IEEE-488 Interface specification is called a standard, variations in

implementation within the specifications are permitted. These variations determine the

capabilities of the particular interface and a list of abbreviations are defined in the Stan-

dard Document to indicate to the User which Interface capabilities have been designed

in. The TABLE 6.3 below gives the options, which are implemented in this instrument.

CODE INTERFACE FUNCTION

SH1 Source Handshake Complete Capability

AH1 Acceptor Handshake Complete Capability

T6 Talker Function.(Basic Talker, Serial Poll, Unaddressed to Talk if

Addressed to Listen).

TE0 No Address Extension Talker Mode

L4 Listener Function.(Basic listener, Unaddressed to listen if Ad

dressed to Talk).

LE0 No Address Extension Listener Mode

SR1 Service Request Complete Capability

RL1 Remote / Local Complete Capability (Including Local Lock Out).

PP0 No Parallel Poll Capability.

DC1 Device Clear Complete Capability

(Accepts DCL & SDC commands and generates a communica

tion soft reset and flashing out the buffer).

DT0 No Device Trigger Capability

C0 No Controller Capability

E1 Tristate driver (Jumper selectable between tristate and open

collector).

TABLE 6.3

6.10 SRQ HANDLING DETAILS

This Programmable Instrument has been configured for SR1 function (Com-

plete SRQ Capability). To make use of this feature you must configure your BUS con-

troller to respond to the IEEE-488 Service Request (SRQ) Interrupt. This unit does not

support Parallel Poll capability.

THE SERVICE REQUEST ENABLE (SRE) REGISTER

The Service Request Enable (SRE) register will enable only those events in

the Status Byte Register to generate an SRQ, when the corresponding bit in the SRE

command *SRE<SP><NR.DATA>, the reasons to generate an SRQ can be defined.

The following table gives the bit definitions of the Service Request Enable (SRE)

BIT DEFINITIONS-SERVICE REQUEST ENABLE (SRE) REGISTER

BIT DESCRIPTION DECIMAL

VALUE DEFINITION

0Not Used 1Always write with 0.

1Not Used 2Always write with 0.

2 Questionable Data 4If this bit is set, an SRQ will be raised

when one or more bits are set in the

Questionable Data register (bits must be

“enabled” in enable Register)

3Not Used 8Always write with 0.

4 Message Available 16 If this bit is written with ‘1’ then an SRQ is

raised when the data is available in the

Instrument’s output buffer.

5 Standard Event 32 If this bit is written with ‘1’ then an SRQ is

raised when one or more bits are Set in

the Standard Event register (bits must be

“enabled” in enable register).

664 Always write with 0.

7Not Used 128 Always write with 0.

The Service Request Enable (SRE) register is cleared when:

*You turn on the power to the instrument.

*You execute a *SRE 0 command.

ENABLING THE SRQ GENARATION:

First use the Service Request Enable ( SRE ) Register to select which

summary Bits of the Status Byte Register will set the low-level IEEE-488 SRQ

Signal. Now write the correct data in the SRE register, for enabling the SRQ reason

in the Status Byte Register. For this the command *STB<SP><NR.DATA> can be

used.After that the query *SRE? Command will return the same value, which was

sent above. Now enable your BUS controller’s SRQ interrupt.

When the Status Byte Register “ REQUEST SERVICE “ bit (Bit 6) is set, an

IEEE-488 SRQ Interrupt message is automatically sent to the BUS controller. The

BUS controller may then POLL the instruments on the bus to identify which one of

the instruments has raised the SRQ. The controller asks all the instruments on the

BUS to place their SRQ message one by one. The one with Bit 6 SET in its Status

Byte Register has requested the SERVICE. Now controller may take necessary

action to service or cancel the SRQ. Reading the status byte using an IEEE-488

Serial Poll only clears the “REQUEST SERVICE” bit or by reading the Event Register

whose Summary Bit (in the Status Byte) is causing the service request.

To read the Status Byte Summary Register, send the IEEE-488 Serial Poll Mes-

sage. Querying the Summary Register will return a Decimal value, which corresponds,

to the binary - weighted sum of the bits, set in the register. Serial Poll will automatically

clear the “ REQUEST SERVICE “ bit in the Status Byte Summary Register. No other

bits are affected. Performing a Serial Poll will not affect the instrument functioning.

USING SERVICE REQUEST (SRQ) AND SERIAL POLL

For example when the Self-Test is performed on this instrument using the com-

mand *TST? (using the IEEE-488 Remote interface ), it takes time for the instrument

to conduct the test and report the results to the BUS controller. The response will be

given at the end of the Self-Test. Here user may have to keep reading from the Output

Buffer of the instrument to know the result. But by using the SRQ function one can do

this task in a better way as explained below. :

1) Enable your BUS controller’s SRQ interrupt.

2) Enable the SRQ reason “MAV” (Message Available Bit) in the Status Byte Regis-

ter by sending the command as *SRE 16.

3) Send the command *TST? from remote for the Self-Test.

4) Wait till your BUS Controller detects an SRQ on the bus.

5) When an SRQ is detected, poll the SRQ from this instrument to read the SRQ

response message as 80 (50 Hex). This means that the RQS bit is set and the

MAV bit is set in the Status Byte Summary Register.

6) Now read the Output Buffer of the instrument from your BUS controller to get the

Response Message of the Self-Test, which will be a 3 digit decimal number like

620 or 603 and so on.

This unit provides complete SRQ function. When the Controller polls the SRQ

Message, it is found that in case of some Controllers that this Response byte gets

latched in the Controller’s Data-out buffer causing addition of an extra character in the

next message which is read against some query command. So it is advisable to give

a Listen to the Controller Chip with sufficient time-out to flush out such character pend-

ing, if any.

6.11 ERROR MESSAGES AND REPORTING

This section explains in short the Error Messages, which are stored in the

ERROR QUEUE. and are reported when read through the SYSTem:ERRor? . The

messages are stored when query command syntax or hardware errors have been

detected. A record of up to 6 errors is stored in the instrument’s error queue. Errors

are retrieved in first-in-first-out (FIFO) order.

*No method is available to read the error queue from the front panel menu.

*The error queue is cleared when power has been off or after a *CLS (clear sta-

tus) command has been executed.

*To read the error queue from the remote interface, send query as:

SYSTem:ERRor?

*Errors have the following format (the error string may contain up to 40 charac-

ters):

-100,“Command error”

ERROR QUEUE:

As the errors and events are detected, they are placed in the queue. This queue

is FIRST IN - FIRST OUT. If the queue overflows, the last error or event in the queue is

replaced with the error

-350,”Queue overflow”

Any time the queue overflows, the least recent errors remain in the queue, and

the most recent error or event is discarded. Reading an error from the head of the queue

removes that error from the queue, and opens a position at the tail of the queue for a

new error, if one is subsequently detected.

When all errors have been read from the queue, further queries for this queue

will return

0,”No error”

till another error is recorded in the error queue.

The error or event queue is cleared when any of the following occur:

*Upon Power up.

*Upon receipt of a *CLS command.

*Upon reading the last item from the error queue.

COMMAND ERRORS

Message: -100,”Command error”

An invalid command was found in the command string. You may have inserted a

character such as #, $, or % in the command header or within a parameter or you have

sent a command which is not supported by the instrument. This error is given for

syntax errors, missing parameter, wrong header, and numeric data error etc.

EXECUTION ERRORS

Message: -200,”Execution error”

A valid command could not be executed because of the unrecoverable TRIP

condition in the related channel(s) or the numeric data given in the command exceeds

the maximum allowed hard limits or the Soft Upper Limits which were set by the Limit

commands. In such cases the instrument generates the Execution error.

DEVICE-SPECIFIC ERRORS

Message: -300,”Device-specific error”

A Device specific failure has occurred or some fault is detected on any one or

more channels of the instrument. When the CHANNEL is ‘Tripped because of the Over

Voltage Protection, Over Current Protection or Over Temperature Protection, this error

is generated. To read the exact cause of the TRIP on that channel the Status Question-

able Data Event Register contents have to be read.

Message: -330,”Self-test failed”

The instruments complete self-test failed from the remote interface (*TST? com-

mand). The result of the self-test is separately reported in the response of the *TST?

query command. The decimal number, which is in response to the above query, indi-

cates what exactly has failed in the Self-test. Refer to next page for more details.

QUERY ERRORS

Message: -400,”Query error”

A Query error is reported when the controller tries to read the instrument’s OUT-

PUT BUFFER without first, sending the query. For every response to be received, a

query command has to be sent first. Also in the READ? query, if the <Channel_list>

does not contain any valid CHANNEL number then also the Query error is recorded.

NC 2

VPROGI 3

VPIN 4

VPROGR 5

AGND3 6

NC 7

NC 8

IPIN 9

IPROGI 10

IPROGR 11

NC 12

NC 13

NC 14

+12V 15

AGND3 16

REMOTE ON/OFF 17

AMX 18

VMX 19

AGND3 20

NC 21

VPSET 22

VMSET 23

IPSET 24

IMSET 25

+S 1

-3

-S 4

NC 5

CS BUS 6

Output +VE

Output -VE LOAD

87654321

SWITCH CONFIGURATION

(ON REAR PANEL)

Fig 4.1a

REMOTE VOLTAGE AND CURRENT PROGRAMMING AND MONITORING

NC 1

Factory Set for 0 to 5 Volts for full scale output programming and monitoring

87654321

for Analoge Voltage

Programming 0-5V

for Analoge Voltage

Programming 0-10V

External Voltage Control

Input +

External Voltage Control

Input +

Control Common

NC 2

VPROGI 3

VPIN 4

VPROGR 5

AGND3 6

NC 7

NC 8

IPIN 9

IPROGI 10

IPROGR 11

NC 12

NC 13

NC 14

+12V 15

AGND3 16

REMOTE ON/OFF 17

AMX 18

VMX 19

AGND3 20

NC 21

VPSET 22

VMSET 23

IPSET 24

IMSET 25

+S 1

-3

-S 4

NC 5

CS BUS 6

Output +VE

Output -VE LOAD

87654321

SWITCH CONFIGURATION

(ON REAR PANEL)

Fig 4.1b

EXTERNAL RESISTANCE PROGRAMMING 0 TO 4.85KOHMS FOR FULL

SCALE VOLTAGE & CURRENT

NC 1

87654321

for Resistance

Programming 0-5V

for Resistance

Programming 0-10V

Ext. Resistance for

voltage control

Control Common

Ext. Resistance for

voltage control

Section 7

Customer support

B&K Precision offers courteous, professional technical support before and after the sale of their

test instruments. The following services are typical of those available from our toll-free tele-

phone number.

1-800-462-9832

lTechnical advice on the use of your instrument.

lTechnical advice on special applications of your instrument.

lTechnical advice on selecting the test instrument for a given task.

lInformation on optional accessories for your instrument.

lInformation on instrument repair and re-calibration services.

lReplacement parts ordering.

lAvailability on service publications.

lInformation on other B&K Precision instruments.

lInformation on other B&K Precision Catalog.

The name of your nearest B&K Precision Distributor.

Call toll free 800-462-9832

Monday through Thursday 8:00 A.M. to 5:00 P.M.

Friday 8:00 A.M. to 12:00 P.M.

Pacific Standard Time

(Pacific Daylight Time Summer)

Section8

Warranty information

Limited One-Year Warranty

B&K Precision warrants to the original purchaser that its products and the component parts

thereof, will be free from defects in workmanship and materials for a period of one year from

date of purchase from an authorized B&K Precision distributor.

B&K Precision will, without charge, repair or replace, at its option, defective product or com-

ponent parts. Returned product must be accompanied by proof of the purchase date in the

form of a sales receipt.

To obtain warranty coverage in the U.S.A., this product must be registered by completing the

warranty registration form on www.bkprecision.com within fifteen (15) days of purchase.

Exclusions: This warranty does not apply in the event of misuse or abuse of the

product or as a result of unauthorized alterations or repairs. The warranty is void if

the serial number is altered, defaced or removed.

B&K Precision shall not be liable for any consequential damages, including without limitation

damages resulting from loss of use. Some states do not allow limitations of incidental or

consequential damages. So the above limitation or exclusion may not apply to you.

This warranty gives you specific rights and you may have other rights, which vary from state-

to-state.

B&K Precision

22820 Savi Ranch Parkway

Yorba Linda, CA 92887

www.bkprecision.com

714-921-9095

Section9

Service Information

Warranty Service: Please go to our website, www.bkpreicsion.com & click on the service/

repair button to obtain an RMA #. Return the product in the original packaging with proof of

purchase to the address below. Clearly state in writing the performance problem and return

any leads, probes, connectors and accessories that you are using with the device.

Non-Warranty Service: Please go to our website, www.bkpreicsion.com & click on the

service/repair button to obtain an RMA #. Return the product in the original packaging to the

address below. Clearly state in writing the performance problem and return any leads,

probes, connectors and accessories that you are using with the device. Customers not on

open account must include payment in the form of a money order or credit card. For the most

current repair charges please visit www.bkprecision.com and click on “service/repair”.

Return all merchandise to B&K Precision Corp. with pre-paid shipping. The flat-rate repair

charge for Non-Warranty Service does not include return shipping. Return shipping to loca-

tions in North American is included for Warranty Service. For overnight shipments and non-

North American shipping fees please contact B&K Precision Corp.

B&K Precision Corp.

22820 Savi Ranch Parkway

Yorba Linda, CA 92887

www.bkprecision.com

714-921-9095

Include with the returned instrument your complete return shipping address, contact

name, phone number and description of problem.

22820 Savi Ranch Parkway

Yorba Linda, CA 92887

USA

TEL: 714-921-9095

FAX: 714-921-6422

www.bkprecision.com

PN: 481-529-9-001

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Ó2004 B&K Precision Corp.