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 What do I need to pay attention to during testing? Cable fault tester manufacturer The cable fault tester adopts the principle of time domain reflection, transmits a series of electrical pulses to the cable under test, and receives the reflected pulses caused by impedance changes in the cable, and then according to the electrical cable fault tester What needs to be paid attention to in the test ? The cable fault tester adopts the principle of time domain reflection, transmits a series of electric pulses to the cable under test, and receives the reflected pulses caused by the impedance change in the cable, and then according to the propagation speed of the electric wave in the cable and the two reflections The time represented by the characteristic inflection point of the wave can measure the distance from the fault point to the test terminal. The cable fault tester is mainly used for the test of power cable open circuit, short circuit, grounding, low resistance, high resistance flashover and high resistance leakage fault, as well as the test of open circuit and short circuit fault of coaxial communication cable and local telephone cable. It can also test the cable path, burial depth, as well as the speed of radio waves, verify the cable length, etc., and can establish cable files for daily maintenance and management.
So what should be paid attention to when using the cable fault tester? What should the cable fault tester pay attention to in the test? 1. During the pulse method test, be careful to throw off all the equipment in the office and measure on the outside line. 2. When using the flashover method to test, the trigger working mode switch must be set to“Flashover”Location. 3. Pay attention to personal safety and equipment safety when using the direct flash method or the dash flash method for testing.
The ground wire must be connected. 4. After the flashover test is completed, cut off the power supply, remove the connecting wire between the instrument and the high-voltage test device, and then discharge the stored charge of the high-voltage capacitor and cable. When discharging, a current limiting resistor R should be added to limit the discharge current to discharge the current slowly. After the voltage on the capacitor is reduced, the resistance in the discharge circuit to the ground is zero, and the instantaneous discharge current can be as high as several hundred amperes, which will cause serious damage. equipment or personal accident.
5. During the test of the direct flash method, attention must be paid to monitoring the leakage current of the fault. If the current suddenly increases and the fault flashover does not appear, the test voltage should be lowered immediately and the flash-over method should be used instead. The smooth flow of the cable fault tester system and the transmission of power are conducive to the normal operation of the cable line. Once there is an obstacle in the line, it will cause interruption of communication and power. If the fault cannot be detected in time and eliminated quickly, it will cause great economic loss and adverse social impact.
Therefore, maintenance personnel must pay attention to ensure the normal operation of the cable fault tester during the work process. Shenzhen Noyafa Electronic Technology Co., Ltd.
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