DLRO10HD 10 A Digital Low Resistance Ohmmeter DLRO10HD 10 Amp Digital Low Resistance Ohmmeter DESCRIPTION Augmenting Megger's DLRO10 and 10X range of low resistance ohmmeters the DLRO10HD combines ultimate simplicity of operation with a rugged IP65 case designed for stable ground and bench operation. The unit is powered from either its rechargeable battery or line power making it suitable for continuous testing in production line/repetitive use environments. Rotary switch controls are simple and easy to operate in all weather conditions and with gloved hands. A large, clear, backlit LCD display is easy to read from a distance. The DLRO10HD provides significantly enhanced compliance and is capable of delivering 10 A into measurements up to 250 m and 1 A into measurements up to 2.5 . The duration of each test may be up to 60 seconds. The DLRO10HD is rated CAT III 300 V. A range of test leads is available to suit the application. The DLRO10HD provides five test modes each of which is selected through a simple rotary control. TEST mODES Automatic unidirectional mode applies current in one direction only to speed up the measurement process. However thermal EMF resulting from dissimilar metal bonds can cause lower accuracy. Test starts automatically when probes are connected. Continuous mode allows repeated measurements to be made on the same sample. Simply connect the test leads and press the test button. The measurement is updated every three seconds until the circuit is broken. n High or low output power selection for condition diagnosis n Rechargeable battery or line power supply, continuous operation, even with dead battery n 10 A for 60 seconds, less time waiting to cool, great for charging inductance n High input protection to 600 V, inadvertent connection to line or UPS voltage will not blow a fuse n Heavy duty case: IP65 lid closed, IP54 operational (battery operation only) n Rotary switch selects one of five test modes, including auto start on connection, giving ease of use Inductive mode is selected when measuring resistance on, for example, motors and generators. When measuring inductive loads it is necessary to wait for the voltage to stabilise as the inductive element is charged. Test leads are firmly connected to the device under test and the `Test' button pressed. The instrument will pass the selected current through the sample continuously in one direction only and take repetitive readings that will gradually decrease to the true value as the voltage stabilizes. The operator decides when the result is stable and presses the `Test' button to terminate the test. ADDITONAL FEATURES AND BENEFITS n Rugged case well suited for transportation and includes a lead set pouch n Removable lid facilitates easy test lead connection n Operational ingress protection is IP54 (battery power only) ensuring protection from the elements n 7Ah lead acid battery provides extended operation and can be charged whilst operating from line power n Rotary mode switch with bidirectional (current reversal with averaging cancels thermal EMFs), unidirectional, automatic, continuous and inductive modes n Large, clear LCD display with backlight and contrast adjustment n Auto power off function conserves battery DLRO10HD 10 A Digital Low Resistance Ohmmeter The DLRO10HD features two ranges with extended compliance. Effectively there are two 2.5 and two 250 m ranges one low power, and one high power. The chart below shows the power output curves for the two 250 m ranges. Each range provided 10 resolution allowing the user to make comparative measurements at either 0.25 or 25 maximum outputs. ELECTRICAL SPECIFICATIONS Resistance/Current Ranges The green resistance ranges on the keypad indicate low output power (<0.25 W) outputs. Red ranges indicate higher 2.5 W (1 A) and 25 W (10 A) power outputs. Resolution and Accuracy Test current accuracy 10% Voltmeter input impedance >200 k Test Resistance Resolution* Basic Full Max. Current Range Accuracy Scale Power Voltage Output APPLICATIONS The DLRO10HD measures low resistance values in applications ranging from railways and aircraft to resistance of components in industry. Any metallic joint can be measured but users must be aware of measurement limitations depending on application. For example, if a cable manufacturer plans to make resistive measurements on a thin wire, a low test current should be selected to prevent heating the wire thereby changing its resistance. Measurements on electric motors and generators will be inductive and require the user to understand the inductive mode and charging process before a correct result is achieved. The DLRO10HD is well suited to measuring thick conductors, bonds and quality of welding because of its 10 A range for resistance values up to 250 m. Electromagnetic noise induced into the leads can interfere with a reading. A noise symbol alerts the user and prevents a measurement when the instrument detects noise above its threshold. 0.1 mA 0 to 2500.0 100 m 0.2% 25 mV 200 m 2.5 W 0.1 mA 0 to 250.00 10 m 0.2% 20 m 25 mV 2.5 W 1 mA 0 to 25.000 1 m 0.2% 2 m 25 mV 25 W 10 mA 0 to 100 2500.0 m 0.2% 200 25 mV 250 W 100 mA 0 to 10 250.00 m 0.2% 20 25 mV 2.5 mW 1A 0 to 1 25.000 m 0.2% 2 25 mV 25 mW 10 A 0 to 2500.0 0.1 0.2% 0.2 25 mV 0.25 W 1A 0 to 100 2500.0 m 0.2% 200 2.5 V 2.5 W 10 A 0 to 10 250.00 m 0.2% 50 2.5 V 25 W * The accuracy stated assumes forward and reverse measurements. Inductive mode or undirectional mode will introduce an undefined error if an external EMF is present. Basic accuracy at reference conditions. SPECIFICATIONS Temperature Coefficient: < 0.01% per C, from 5 C to 40 C Maximum Altitude: 2000m (6562 ft) to full safety specifications When dissimilar metals are joined a thermocouple effect is created. Users should select a bidirectional mode to ensure cancellation of this effect. The instrument measures with current flowing in both directions and averages the result. Display size/type: Normal mode is initiated by pressing the `Test' button after connecting the test leads to the unit under test. Continuity of all four connections is checked. Current is applied in both forward and reverse direction following which measurement is displayed. Charge time: 8 hours Automatic mode is started as soon as the probes make contact. Forward and reverse current measurements are made and the average value is displayed. This mode is ideal when working with the supplied DH4 handspikes. Each time the probes are removed and reconnected to the load a new test will be performed without the need to press the test button. Mode Selection: Rotary switch Main 5 digit + 2 x 5 digit secondary displays Battery type: 6 V, 7Ah sealed lead acid Voltage input range: 90 - 264 V, 50-60 Hz Backlight: LED backlight Battery life: 1000 Auto (3 sec) tests Auto power down: 300s Range selection: Rotary switch Weight: 6.7 kg Case dimensions: L315mm x W285mm x H181mm Pouch for test leads: Yes (lid mounted) DLRO10HD 10 A Digital Low Resistance Ohmmeter Test leads: DH4 lead set included EmC IP rating: IP65 case closed, IP54 battery operation In accordance with IEC61326-1 (Heavy industrial) Safety rating: In accordance with IEC61010-1, CATIII 300 V Noise rejection when used with DH7 leads Operating temperature and humidity -10 C to +50 C (14 F to 122 F) <90% RH Less than 1% 20 digits additional error with 100 mV peak 50/60 Hz. on the potential leads. Warning will show if hum or noise exceeds this level. Reference conditions: 20 C 3 C Maximum lead resistance Storage temperature and humidity 100 m total for 10 A operation irrespective of battery condition. -25 C to +60 C, <90% RH DLRO PRODUCT COmPARISON gUIDE DLRO10 Feature Power limited ouput test ranges (<0.25 W) DLRO10X DLRO10HD DLRO10 DLRO10HD DLR010X n n n High power output test ranges (25 W) Benefit/s Negligible heating, little need for contact temperature compensation Can help to highlight contamination Extends battery life Can help to highlight weakness with heating, such as poor connection due to rough surfaces or broken strands on cables Improved inductive load performance n Auto current reversal n n n Auto start (continuity detection) n n n Fast operation without pressing test button Inadvertent connection to live line supply or UPS voltage will not even blow a fuse Testing just continues as normal Cancels out thermal EMFs High input protection <600 V n n n Noise immunity specified at 100 mV n n n Noise limit exceeded indicator n n n Confidence that measurements are not effected Continuous testing with optional second battery. Use one battery while second charges Make measurement in harsh environments User interchangeable detachable battery pack n n Hang from neck operation n n Ideal for use up ladders and platforms improved manoeuvrability Operate from mains/line supply n Continuous testing from mains ideal for manufacturing applications Always ready to test no waiting for battery to charge IP65 lid closed n Can be transported in any wet conditions IP54 in use n Can be operated in the rain Ultra tough case n Built to take the knocks in the most arduous of conditions Test result storage with memos Printer and PC output n n Ideal for predictive maintenance systems Less errors in writing down test results Save results to your PC or send to a printer User selectable test limits n Aids rapid testing to specified limits DLRO10HD 10 A Digital Low Resistance Ohmmeter ORDERINg INFORmATION Item (Qty) DLRO10HD Low Resistance Ohmmeter Included Accessories Cat. No. 1000-348 DH4 duplex handspike 1.2m Test lead pouch (lid mounted) DLRO10HD user guide CD Warranty book Optional Accessories at extra cost Calibration Shunt,10 , current rating 1 mA Calibration Shunt, 1 , current rating 10 mA Calibration Shunt, 100 m current rating 1 A Calibration Shunt, 10 m current rating 10 A Certificate of Calibration for Shunts, NIST Replacement tips for DH4, DH5 and DH7 handspikes Needle point Serrated end Optional Test Leads at extra cost Duplex Leads DH5 straight duplex handspikes (2) One has indicator lights 2.5m/8ft DH7 Duplex handspikes (2) suitable for working on 600 V. systems 2.5m/8ft Duplex Handspikes (2) with spring loaded helical contacts 2m/7ft DH1 2.5m/8ft 5.5m/18ft only 1 lead supplied DH2 6m/20ft 9m/30ft DH3 9m/30ft 6111-503 1000-036 2000-869 6170-618 UK Archcliffe Road Dover CT17 9EN England T +44 (0) 1304 502101 F +44 (0) 1304 207342 UNITED STATES 4271 Bronze Way Dallas TX 75237-1088 USA T 800 723 2861 (USA only) T +1 214 333 3201 F +1 214 331 7399 249000 249001 249002 249003 CERT-NIST 25940-012 25940-014 6111-517 1001-035 242011-7 6111-022 242011-18 6111-023 242011-30 6111-024 Item (Qty) Straight Duplex Handspikes (2) Heavy Duty with fixed contacts Duplex Heavy Duty 5cm (2") C-Clamps (2) Cat. No. 2m/7ft 5.5m/18ft 9m/30ft 242002-7 242002-18 242002-30 2m/7ft 5.5m/18ft 9m/30ft 242004-7 242004-18 242004-30 Duplex handspikes with replaceable Needle Points 2m/7ft 242003-7 Duplex 1.27 cm (1/2") Kelvin Clips, (2) gold plated 2m/7ft 241005-7 silver plated 2m/7ft 242005-7 Duplex 3.8 cm (1 1/2") Kelvin Clips (2) 2m/7ft 242006-7 5.5m/18ft 242006-18 9m/30ft 242006-30 Single Leads Single handspike (1) for potential measurement 2m/7ft 242021-7 5.5m/18ft 242021-18 9m/30ft 242021-30 Current clip (1) for current connections 2m/7ft 242041-7 5.5m/18ft 242041-18 9m/30ft 242041-30 Note: For more details of optional lead sets see separate test lead datasheet DLRO_TL_DS_en_V04.pdf OTHER TECHNICAL SALES OFFICES Norristown USA, Sydney AUSTRALIA, Toronto CANADA, Trappes FRANCE, Kingdom of BAHRAIN, mumbai INDIA, Johannesburg SOUTH AFRICA and Conjure THAILAND. Registered to ISO 9001:2000 Cert. no. Q 09290 Registered to ISO 14001-1996 Cert. no. EMS 61597 DLR10HD_DS_en_USV03 www.megger.com megger is a registered trademark