(1) The pointer of the meter does not move, including when checking the battery voltage and during ground resistance measurement, the pointer does not move, but the "OK" light is on. The fault is caused by a burnt meter head or a broken connection between the meter head and the circuit board. Open the meter panel and manually move the pointer. If the pointer cannot return to zero automatically, the meter head is damaged by shock; otherwise, solder off the meter head and measure it with a multimeter in resistance mode. If it is open circuit, the meter head is burnt. Then use the multimeter in current/voltage mode to measure the original connection terminals of the meter head. Press the voltage check button of the ground resistance tester. If the multimeter shows a voltage indication, the instrument fault is caused by the damaged meter head, and it can be repaired by replacing the meter head. If the meter head is intact, open the instrument casing and check the meter head connections; if disconnected, reconnect them. The cable AC withstand voltage test device is suitable for AC withstand voltage tests of cables such as 10kV and 35kV. The cable AC withstand voltage test device mainly consists of a variable frequency power supply (main unit), an excitation transformer, a resonant reactor, and a capacitive voltage divider.
Such faults are usually caused by excessive vibration during use or transportation. Therefore, attention should be paid to shock prevention during use and transportation to avoid unnecessary damage.
(2) The battery voltage is normal but ground resistance measurement cannot be performed. This fault is usually caused by problems in the switching power supply, AC/DC conversion, and constant current output part. Use a frequency counter to measure the C port. If there is no 820Hz AC output, check this part of the circuit step by step, from the output transformer, switching tube, oscillator circuit, etc., to find the faulty part and replace it with new components to repair.
(3) The battery voltage is normal but the measurement data is inaccurate with large errors during ground resistance measurement. This fault is usually caused by problems in the detection signal filtering and calibration circuit. A common cause is damage to the filter inductor T1, and replacing the T1 inductor can repair it.
(4) During ground resistance tester measurement, the measurement data fluctuates, sometimes accurate and sometimes not. This phenomenon usually indicates no fault in the "KYORITSU 4102A" ground resistance tester. The problem lies in poor connections between the resistance tester and the ground spikes (auxiliary electrodes) and the tested grounding body. Common issues include broken or loose connections in the three connecting wires, leading to poor conductivity. If during use it is found that the wires are disconnected from the metal connectors at both ends, they must be re-soldered firmly with solder to ensure normal measurement operation of the instrument.
