1. Firstly, it is necessary to judge whether the cable fault is high resistance, low resistance or grounding. Different test methods can be adopted according to this condition. Two or three pulses can be used to measure the fault distance. Compared with the traditional test methods, the advantage of the two or three pulse method is to simplify the complex waveform in the impulse high-voltage flashover method into a simple low-voltage pulse short-circuit fault waveform. Therefore, the interpretation is very simple and the fault distance can be accurately calibrated. 2. When finding the path, the manufacturer of the cable fault tester shall add a signal to the cable, then the receiver shall receive the signal, and walk along the path with the signal to determine the path of the cable. 3. Accurately locate according to the measured distance. When the cable fault tester manufacturer hears a loud sound from the headset of the pointing instrument, it is to find the location of the fault point.