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This 200 A low-resistance ohmmeter measures contact resistance in high-voltage circuit breakers and other low-resistance measurement applications. Lead sets sold separately.
This 200 A low-resistance ohmmeter measures contact resistance in high-voltage circuit breakers and other low-resistance measurement applications. Lead sets sold separately.
The DLRO200-US-NLS measures contact resistance in high voltage circuit breakers, disconnecting switches (isolators), busbar joints, or for any low resistance measurement. It accurately measures resistances between 0.1 µΩ and 1 Ω at test currents from 10 A up to 200 A, subject to the load resistance and supply voltage. Extra filtering on the output provides a smooth DC current that eliminates magnetic transients capable of inductively tripping breaker controls. This version is supplied without a test lead set.
Features
Test Modes
The microhmmeter operates in one of three modes, which are simply selected from the on screen menu.
CONTINUOUS mode is provided for users who wish to monitor a resistance over a period of time. Connect the test leads, select the test current and press the TEST button. It will pass a current continuously, and measure the resulting voltage at 2-second intervals, until the test button is pressed to stop the test or the test circuit is interrupted.
In NORMAL mode you connect the leads, select the test current and press the TEST button. The test current will ramp up to the desired level, hold for two seconds and then ramp down. The whole process takes approximately 10 seconds.
In AUTO mode select the desired current, connect the current leads and press the TEST button. The TEST lamp will flash to show that the microhmmeter is ready to carry out a test. As soon as the potential leads are connected, a test will start. To repeat a test, simply break contact with the voltage probes and remake contact.
Measuring individual joints in a busbar is a good example of the convenience to be gained by using AUTO mode. The two current leads are connected to the ends of the busbar. They will remain connected here until all tests have been completed. When the voltage leads make contact across a joint, it detects that all four leads are connected, carries out a test and stops. When you move to the next joint DLRO detects the new completed circuit automatically and carries out the next test, and so on until all joints have been tested. The results may be stored automatically and may be recalled to the display or downloaded for review.
Applications
| Measurement | |
| Range | 0.1 μΩ to 999.9 mΩ (subject to supply voltage and leads used) |
| General Specifications | |
| Co-Efficient | <0.05% per °C |
| Measurement | |
| Accuracy | Voltage ±0.5% ± 0.1 mV Current ±0.5% ± 0.1 A Resistance: Better than 1% from 300 μΩ to 100 mΩ Better than ±2% from 100 to 300 μΩ |
| Current Lead Resistance | 4 mΩ |
| Maximum Continuous Test Time | More than 10 minutes at 200 A and 20°C ambient |
| Test Modes | Manual, Auto, Continuous |
| Test Time | 10 seconds NORMAL/AUTO mode. Refreshed every 2 seconds in CONTINUOUS mode |
| Test Current | |
| Range | 10 to 200 A DC (dependant on load and input voltage) |
| Accuracy | ±2% ±2 A |
| Voltmeter Input Impedance | >200 kΩ |
| Hum Rejection | 5 Vrms 50/60 Hz |
| General Specifications | |
| Display | Large, high resolution backlit liquid crystal display |
| Warnings | Current flowing - LED. Other warnings are shown on the LCD display |
| Data Transfer | Real time or batch download via RS232 using Download Manager |
| Storage Capacity | 300 result sets and memo, battery backed for 10 years |
| Memo Field | 160 characters maximum |
| Temperature | Operating: -14 to 122°F (-10 to 50°C) Storage: -13 to 149°F (-25 to 65°C) |
| Calibration | 20°C |
| Maximum Humidity | 95% RH non-condensing |
| Maximum Altitude | 6561.68' (2000 m) |
| Safety | IEC61010-1 |
| EMC | IEC61326-1 |
| Dimensions | 16.4 x 9.84 x 10.63" (410 x 250 x 270 mm) |
| Weight | 31.97 lbs (14.5 kg), excluding test leads |
Test leads are NOT included with this version and must be ordered separately.
Click on a category to view a selection of compatible accessories with the Megger DLRO200-US-NLS Ducter Digital Low Resistance Ohmmeter, 200 A.
| Measurement | |
| Range | 0.1 μΩ to 999.9 mΩ (subject to supply voltage and leads used) |
| General Specifications | |
| Co-Efficient | <0.05% per °C |
| Measurement | |
| Accuracy | Voltage ±0.5% ± 0.1 mV Current ±0.5% ± 0.1 A Resistance: Better than 1% from 300 μΩ to 100 mΩ Better than ±2% from 100 to 300 μΩ |
| Current Lead Resistance | 4 mΩ |
| Maximum Continuous Test Time | More than 10 minutes at 200 A and 20°C ambient |
| Test Modes | Manual, Auto, Continuous |
| Test Time | 10 seconds NORMAL/AUTO mode. Refreshed every 2 seconds in CONTINUOUS mode |
| Test Current | |
| Range | 10 to 200 A DC (dependant on load and input voltage) |
| Accuracy | ±2% ±2 A |
| Voltmeter Input Impedance | >200 kΩ |
| Hum Rejection | 5 Vrms 50/60 Hz |
| General Specifications | |
| Display | Large, high resolution backlit liquid crystal display |
| Warnings | Current flowing - LED. Other warnings are shown on the LCD display |
| Data Transfer | Real time or batch download via RS232 using Download Manager |
| Storage Capacity | 300 result sets and memo, battery backed for 10 years |
| Memo Field | 160 characters maximum |
| Temperature | Operating: -14 to 122°F (-10 to 50°C) Storage: -13 to 149°F (-25 to 65°C) |
| Calibration | 20°C |
| Maximum Humidity | 95% RH non-condensing |
| Maximum Altitude | 6561.68' (2000 m) |
| Safety | IEC61010-1 |
| EMC | IEC61326-1 |
| Dimensions | 16.4 x 9.84 x 10.63" (410 x 250 x 270 mm) |
| Weight | 31.97 lbs (14.5 kg), excluding test leads |
Test leads are NOT included with this version and must be ordered separately.
Click on a category to view a selection of compatible accessories with the Megger DLRO200-US-NLS Ducter Digital Low Resistance Ohmmeter, 200 A.
