Electricity workers in practical work, often need to use insulation resistance tester. Which is mainly used for power transformer, relays, power generators, lightning arrester and so on high voltage power equipment insulation resistance testing, the instrument has many characteristics such as high accuracy, convenient and flexible, and it is popular with large power workers. But before use the equipment, there are still many problems need to be aware of, this article will give you a brief introduction about “What preparations should be made before using the insulation resistance tester?”

1. After receiving the instrument, it needs to be charged for 6 hours. Otherwise, the instrument will not work properly.

2. Before the test, the power supply of the test equipment and all external connectors should be removed. After the short connection, the test object should be grounded and discharged for 1 minute.Large capacitors should discharge for at least 2 minutes to avoid electric shock and affect the test results.

3. Clean the surface dirt of the test object with a clean soft cloth. If necessary, clean the housing surface with gasoline to eliminate surface leakage current to avoid affecting the test results.

4. Insert the red plug end of the high voltage test wire into the (3) end of the cable, insert the green plug end into the (2) protection end, and insert the probe or clip on the other end into the high voltage wire equipment. Insert the test wire (green) into the (2) “ground” end (right side) and the other end is inserted into the high voltage protection ring of the device under test to eliminate the influence of surface leakage current (see the use of shield end). The black secondary test wire is inserted into the ground. 

5. If you need to stop the test, loosen or rotate 12 points counterclockwise, then loosen the test key. At this point, the instrument stops high-voltage output and displays the test results.

6. To eliminate surface leakage and interference from external electromagnetic fields, the shielding end of the instrument is used to eliminate leakage current and interference from insulation measurements of external electromagnetic fields, such as power cables.

High voltage insulation resistance tester is a kind of high voltage power test equipment that is often used by power workers in their work. The frequency of use is relatively high. At the same time, the equipment is also very simple to use, which is easy for power workers to master.