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Detection process of loop resistance tester

time:2020/8/7   source:华天电力  reading:289 time

The loop resistance tester is a special test equipment for measuring the contact resistance and loop resistance of switches, circuit breakers, transformers and other equipment. A typical four-wire measurement method is used to output a DC current between the buttons on both ends of the measured body and measure the voltage drop caused by the current flowing through the measured body. Then obtain the DC resistance of the measured body through the ratio of voltage to current.


Micro Ohmmeter.png


1. Connect the test line to the instrument and clamp the sample.


2. Connect the wires (or clamp the grounding clamp to the metal part of the box handle).


3. Connect the power supply, turn on the switch, and enter the test length correctly.


4. Correctly select the test current profile.


5. If the measured current is less than 100A/200A or zero, check whether the connection circuit is good.


6. If the measurement time is too long and the power supply is unstable, it will be automatically protected. The power supply can be turned off for a period of time (about 10-20 minutes) to cool down the power supply before it can be.


7. After the measurement is completed, the machine displays the test result. At this time, press the print button to print, and press the test button to retest.


8. Before starting the test, you must choose to test the current configuration file! (There is a current selection model).


9. The interval between two tests is not less than 30 seconds.


10. It is recommended to use the average value of the three tests (the deviation of the test value due to surface oil pollution or poor contact).


11. If the current lines are equivalent during the test, the instrument automatically recognizes that the current output control is off and "Please check the line".


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