How to Accurately Judge and Find Cable Fault

Cable is an important part of signal equipment, but in the process of use, it is difficult for ordinary users to find the fault point, and they do not know what the reason is. Therefore, it is particularly important to quickly find the cable fault and judge the fault point. Wd-a10 cable fault tester is a set of comprehensive cable fault detector, which can test cable short circuit, cable disconnection, poor contact and other faults. By summarizing the previous experience, the factors affecting the test accuracy of cable fault tester are analyzed as follows. Since the accuracy of adjusting wave velocity is closely related to the accuracy of test, adjusting wave velocity has become the key to solve the problem. At least two conditions are required to accurately adjust the wave velocity: â‘  the length of the measured cable; â‘¡ There is a good core wire of the tested cable, which is not grounded. Adjust the measurement range without grounding. Connect a good core wire of the tested cable with a known length to the output port of the power cable fault tester and connect it with the red clip wire, the black clip wire and the ground, or another good core wire of the cable. Change the measurement range to match the actual length of the cable. If the actual length of the cable is less than 161.4m, the measurement range shall be adjusted to 161.4m; If the actual length of the cable is greater than 161.4 m and less than 322.8 m, adjust the measurement range to 322.8 m, and so on. The preset wave velocity is 200 220m / μ Set a wave velocity randomly between S and measure it as the wave velocity of the initial test. It is assumed that the wave velocity measured initially is 200 220 M / & mu; S is because the signal cables usually used are in this range. This step is very important. If this step is not set, the initial measured cable length is very different from the actual cable length, and it is difficult to adjust in the next step. After adjusting the wave velocity and measuring the distance of the fault point, compare it with the actual cable length. If the distance between the fault point displayed on the top of the screen is the same as the actual cable length, the original set wave speed, that is, the wave speed displayed on the screen is the actual wave speed of the cable. When testing any point fault of the cable, this wave speed can be used as the benchmark for testing; If the distance of the fault point displayed on the top of the screen is different from the actual cable length, you can simply adjust the wave speed with the cursor still, which can be large or small, so that the fault distance above the screen is the same as the actual length of the cable, then the adjusted wave speed is the actual wave speed of the cable. When testing the cable fault, you can use this wave speed as the benchmark.

How to Accurately Judge and Find Cable Fault 1

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