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–CCTV Tester
Precautions for the use of the cable identification instrument What are the common faults and precautions in the use of the cable identification instrument? If you want to know more about it, please take a look. 1. During the pulse method test, pay attention to throwing off all the equipment in the office and measure on the outermost line. Precautions for the use of the cable identification instrument What are the common faults and precautions in the use of the cable identification instrument? If you want to know more about it, please take a look.
1. During the pulse method test, pay attention to throwing off all the equipment in the office and measure on the outermost line. 2. When using the flashover method to test, the trigger working mode switch must be placed in“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 method of the cable fault tester is completed, cut off the power supply, remove the connection line 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 direct-flash test, attention must be paid to monitoring the leakage current of the fault. If the current suddenly increases and the fault flashover has not occurred, the test voltage should be lowered immediately and the flash-over test should be used instead.
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