A cable fault tester is a device used to detect various faults in cables. When there is a problem in the operation of the cable, it is difficult for ordinary people to judge the fault point. Only with the help of the cable fault tester can the cable in the problem section be detected, so as to determine the fault point and fault cause of the cable according to the detected display results, and then carry out targeted solutions!So what are the test methods for using a cable fault tester?Let's take a good look with Frude!
1. Pulse fault ranging method:
This method is a very traditional fault ranging method, which uses the time it takes for the radio waves generated by the fault point to propagate to the test point to calculate the distance to the fault point. This method is applicable to all cable faults, but the test accuracy is low because the test results are greatly affected by the length of the cable and the strength of the reflected pulse at the fault point.
2. Low-pressure pulse reflection method:
The low-voltage pulse-reflectometry method is mainly used for low-impedance cable fault testing. By applying a low-voltage pulse in the cable, the reflected echo is created due to impedance mismatch when the pulse hits a point of failure during propagation. By recording echoes with an oscilloscope, the location of the point of failure can be analyzed. This method is simple to operate and intuitive to understand.
3. Direct flash method:
The flash method is a test method used for flash faults. In this method, a DC voltage is applied to the cable to cause a flash discharge at the point of fault, resulting in a detectable radio wave signal. The location of the point of failure can be calculated by analyzing the propagation time of the echo signal. Because the direct flash method needs to operate at higher voltages, special attention needs to be paid to safety.
4. Flash method:
The flash method is a method that is somewhere between the direct flash method and the low-pressure pulse reflection method. This method causes the point of failure to flash discharge at a higher voltage by applying a gradually increasing voltage to the cable. Compared to the direct flash method, the flash method is safer to operate and can also produce a detectable radio wave signal. The location of the point of failure can be calculated by analyzing the propagation time of the echo signal.
5. Quadruple pulse method:
The quadratic pulse method is a relatively new fault ranging method. This method works by applying a pulse signal to the cable, and when the pulse signal hits a point of failure during propagation, the reflected echo is generated due to impedance mismatch. In the echo signal, there are two pulse signals and one pulse signal, the second pulse signal is separated by a special circuit, and then applied to the cable to generate a new reflected signal. By analyzing the primary and secondary reflection signals, the location of the fault point can be calculated more accurately. This method is simple to operate and has high accuracy, which is an ideal method for fault ranging.
There are five main test methods for the cable fault tester introduced above, I hope you can understand, which is of great help to the subsequent cable fault test. To see more about the products of cable fault tester, welcome to: