How to test the insulation withstand voltage of the communication network port to the casing

the method for testing the insulation withstand voltage of the enclosure through the communication network port is as follows.

1. clamp one end of the withstand voltage tester directly on the shell of the device under test, and connect the other end of the tester to the input power end of the device under test.

2. Slowly adjust the voltage to the withstand voltage value to be tested. If there is no alarm, it means it has passed.