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–Noyafa Cable Tester
How to use a low-voltage cable fault tester for fault testing? How to use a low-voltage cable fault tester for fault testing? Do you know the basic steps of fault testing: measure faulty cables with a shaker or a multimeter The method of fault testing with the low-voltage cable fault tester The method of using the low-voltage cable fault tester for fault testing Do you know the basic steps of fault testing: measure the insulation resistance of the faulty cable with a shaker or a multimeter, determine the nature of the fault, and determine the test method ; Test the fault distance; Detect the path of the cable buried near the fault point; fix the point. Disconnect all wires from the cable terminations before testing. The panel of the test system has“input amplitude”and“displacement”Two knobs are used to adjust the signal amplitude and the upper and lower positions of the next sampling respectively.
Let's take a closer look at the low-voltage pulse method. The 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. Connect the communication cable of the low-voltage cable fault tester to the serial port on the back of the notebook computer. connected to the input of the system. It is also possible to directly connect the input line of the test system to the fault phase and the ground line.
1. Speed measurement For some cables, the speed of radio wave propagation is unknown and must be determined by testing. But the full length of the cable must be known before testing. exist“testing method”menu selection“low voltage pulse”“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.
2. Measure the fault When the fault is measured, the“test method”menu selection“low voltage pulse”“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 circuit fault has the same polarity as the transmitted pulse, and the reflected signal of the short circuit fault has the opposite polarity to the transmitted pulse. The method of using the low-voltage cable fault tester for fault testing The low-voltage cable fault tester The method of using the low-voltage cable fault tester for fault testing do you know Shenzhen Noyafa Electronic Technology Co., Ltd.
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