1. Before the test, check whether the test product, DC high voltage generator, pressure doubler, discharge rod, grounding wire, and connecting wire of the test product are well connected, and check whether the grounding wire is connected correctly.
2. The high-voltage output wiring must be firm, and the high-voltage lead wire must be prevented from falling off during the test, and the instrument may be damaged by direct discharge to the ground.
3. During the high voltage test, surrounding objects and personnel must maintain a sufficient safety distance
3. Install two obvious disconnection points before the working power supply enters the tester. When replacing the tested object and wiring, the working power supply disconnection point should be clearly disconnected first;
4. During the cable withstand voltage test, the boosting process should be uniform and slow, and the depressurizing process should also be uniform and slow. At the same time, a protective water resistance should be added to the high-voltage output end. Otherwise, the reverse voltage may damage the instrument.
5. The discharge of the large-capacity test product should be discharged through a 100Ω/V discharge resistance rod. The discharge rod should not be in contact with the test product immediately during discharge. The discharge rod should be gradually approached to the test product until a certain point. There is a hissing sound when the free discharge starts from the air gap. When there is no sound, the ground terminal of the dian rod can be used to discharge, and then directly connect to the ground wire for discharge;
6. When the DC high voltage of the DC high voltage generator is 200KV and above, although the tester wears insulating shoes and is outside the safe distance, due to the influence of the distribution of the high voltage DC ion space electric field, several adjacent standing body belts will be affected. There are different DC potentials. Testers should not shake hands with each other or touch the grounding point with their hands, otherwise there will be a slight electric shock. This phenomenon is more obvious in dry areas and winter, but generally it will not cause harm to people due to low energy;
7. After the test is over, the test object should be discharged several times with a discharge rod, and the test object can only be approached for subsequent disassembly after full discharge.
8. The interval between two tests (referring to the power-off time) should not be less than 5 minutes to ensure that the instrument can be fully dissipated.