When we use the cable fault tester in the process of occasional waveform instability or incorrect conditions, resulting in this situation is what? Today, let's take you to understand how it works.
Factors affecting the waveform of cable fault tester include:
(1) Insulation layer material of cable. If it is oil paper cable or pure crosslinked polyethylene material, the fault waveform is simple and clear; If it is polyvinyl chloride material, affected by additives and other bad wave propagation characteristics, the fault waveform attenuation is fast, fault point reflection is difficult to identify;
(3) Whether the insulation resistance of the cable fault is less than 1000 ohms, when it is less than 1000 ohms, the reflection waveform of the fault point is clear;
(4) whether the pulse reflector has the function of comparison method, the pulse reflector with comparison method will show the waveform of good phase and bad phase in the same screen at the same time, and the bifurcation point of the waveform of the two is the location of the fault point;
(5) Whether there is T connection branch cable in the tested cable. If yes, the TDR partner is required to assist in applying the breaking signal of the TDR partner to the remote end of the main cable or branch cable under test, so that the waveform transmitted at the fault point can be separated from the remote end of the branch cable.
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