By hvhipot 
Faults and troubleshooting methods of the DC resistance tester:
1. There is no display when the machine is turned on. The reason is that there is no AC 220V. The treatment method is to check the power cord and insurance.
2. The display is abnormal, mainly because the motherboard or the monitor is faulty. The solution is to check the computer motherboard or replace the monitor.
3. The fuse is blown during charging. The main reason is the failure of the current series resonance. The solution is to replace the constant current switching power supply.
4.display failure 1. The main reason is the hardware circuit failure, the treatment method is to check the computer motherboard.
5. Display failure 2. The main reason is that the current loop is blocked or the current series resonance is faulty. The treatment method is to check the wiring.
Sixth, display failure three, the main reason is that the charging current cannot meet the requirements, and the treatment method is that the contact resistance is too large.
Seven, display failure fHV Hipot Electric Co., Ltd., the main reason is that the tested product exceeds the measurement range. Product features of DC resistance tester:
1. Fast measurement speed: The instrument outputs a large constant current of 10A, which can effectively compensate for the current inertia of large inductance equipment during measurement, accelerate the saturation of the iron core, thereby shortening the charging time and improving the measurement speed. The electric bridge is hundreds of times faster.
2. High accuracy: This resistance tester uses the advanced high-power and high-precision programmable constant voltage and constant current technology of the single-chip microcomputer to keep the charging current of the inductive load at a relatively stable value, with stable anti-inductance and strong anti-interference ability , Thereby ensuring the accuracy of the measurement.
3. The instrument has a high degree of intelligence, compact structure, novel and reasonable layout. In addition to the advanced fHV Hipot Electric Co., Ltd.-terminal measurement method, it also adopts dual-path control comparison analysis, automatic zero adjustment and calibration. It is equipped with anti-arc and data analysis circuits. It automatically outputs and prints measurement data, menu operation, man-machine dialogue, and operation readings. convenient.
In the measurement process of the DC resistance tester, in addition to strictly complying with the electrical safety regulations and equipment test regulations, special attention must be paid to the measurement under the condition of stable coil temperature. The temperature difference between the upper and lower parts of the transformer tank is required to be no more than 3 ℃. Due to the inductance of the transformer coil, the charging current during measurement is not stable, so the counting must be performed after the current is stable, and measures to shorten the charging time should be taken if necessary. Try to reduce the wire contact resistance in the test circuit. The transformer taps in operation are often affected by oil film and other dirt to make their contact poor. Generally, it is necessary to switch several times before measuring to avoid misjudgment. When measuring the low-voltage side of the transformer, all personnel should keep a proper safe distance from the high-voltage side.