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–Cable Tester Manufacturer
The bridge method of the cable fault tester test method The bridge method of the cable fault tester is to measure the DC resistance value of the cable core wire with a double-arm bridge, and then accurately measure the actual length of the cable. According to the proportional relationship between the cable length and the resistance, The bridge method of the cable fault tester is to measure the DC resistance value of the cable core wire with a double-arm bridge, and then accurately measure the actual length of the cable, according to the cable length and resistance. The proportional relationship is calculated to calculate the fault point. This method is a traditional and effective method for low-resistance faults. The operation is relatively simple and the precision is high.
However, due to the limitation of bridge voltage and galvanometer sensitivity, the bridge method of cable fault tester is only suitable for DC resistance less than 100 kΩThe low resistance leakage fault, and it is required that at least one cable is fault-free. This method is not applicable to high-resistance faults, wire-break faults and faulty cables with three-phase leakage.
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