NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–POE Tester
Cable fault tester manufacturers Briefly analyze the method of finding fault points! The fault test is generally divided into the following steps: First, find out the basic situation of the faulty cable: use a shaker and a multimeter to measure the insulation resistance of the faulty cable, and use the low cable fault tester manufacturer to briefly analyze the fault point testing method! The fault test of the cable fault tester manufacturer is generally divided into the following steps: First, find out the basic situation of the faulty cable: use a shaker and a multimeter to measure the insulation resistance of the faulty cable, and use a low-voltage pulse to measure the full length of the cable, whether there is a broken wire or a short circuit. Wait. Second, determine the appropriate test method according to the specific situation of the fault, and measure the cable fault distance. Generally, we put the disconnection fault and the DC resistance value at 100ΩThe following cable faults are called low-resistance (open-circuit) faults, and are tested by the low-voltage pulse method.
Third, detect the path and depth of cable burial near the fault point. The manufacturer of the cable fault tester finally determines the exact location of the fault point. Disconnect all wires from the beginning and end of the cable before testing.
The panel of the test system has“input amplitude”and“displacement”Two knobs are used to adjust the amplitude of the input signal for the next sampling and the up and down position of the waveform. Cable fault tester manufacturer Cable fault tester test method 1. Low-voltage pulse mode Low-voltage pulse is used to test the speed of radio wave propagation in the cable, the total length of the cable, low-resistance faults and open-circuit faults. The manufacturer of the cable fault tester adds the input wire of the tester to the ground wire and the faulty phase of the faulty cable respectively.
According to the specific situation of the fault, the input line can also be added to the two phase lines for testing. 1. Speed measurement For some cables, the speed of radio wave propagation is unknown and must be determined by testing. As long as we know the full length of the cable, we can calculate the speed of the wave propagation in the cable through testing.
exist“testing method”menu selection“Speed measurement”, choose according to the length of the cable“0.2μS”or“2μS”, generally use 0.2 below 500 mμS. After typing the full length of the cable press“sampling”key, with adjustment“displacement”and“Amplitude”Turn the knob to make the amplitude and baseline of the signal in an easy-to-observe position. Move the cursor to the falling edge of the low-voltage pulse and press“position”, and then move the cursor to the leading edge of the reflected signal, and the screen will display the propagation speed of the radio wave in the cable.
If the transmitted and received waveforms are too close, press“expand”key to expand the waveform and then calculate. Cable fault tester manufacturers 2. Test the fault in“test method”menu selection“fault detection”, and select the appropriate pulse width, press“sampling”The fault waveform will then be displayed on the screen. The reflected signal of the open fault has the same polarity as the transmitted pulse, and the reflected signal of the short fault has the opposite polarity to the transmitted pulse.
Note for cable fault tester manufacturers: Since the wiring and waveform when measuring the full length of the cable are exactly the same as when testing the open-circuit fault, the full-length menu is not listed separately in the program. The waveforms of the low voltage pulse test open fault (full length of cable) and short fault are as follows. Shenzhen Noyafa Electronic Technology Co., Ltd.
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