By hvhipot 
What is the reason why the generator has no high voltage output during the test of the DC high voltage generator? Investigate the reason: The distilled water in the high-pressure water resistance will dry up due to long-term storage. Once such things happen, the generator will have no high-voltage output.
DC high-voltage generators have a common defect, which is equipped with a built-in current-limiting resistor (actually a built-in water resistance) in the press cylinder. After the DC high voltage generator is used for a period of time, the distilled water in the built-in water resistance will dry up. Once such things happen, it will cause the generator to have no high voltage output.
Solution:
1. Refill distilled water into the high-pressure water resistance;
2. Remove and short-circuit the original one, and install an external current-limiting resistor to solve this type of failure.
safety warning
● The staff using the DC high voltage tester must be a professional with a “high voltage test certificate”.
● To use this instrument, the user must follow Article 168 of the “Electric Safety Regulations” and install two obvious disconnect points before the working power supply enters the tester; when replacing the test product and wiring, the two power disconnect points should be disconnected first Obviously disconnected.
● Before the test, please check whether the grounding wire of the tester control box, the pressure doubler and the test product are well connected.
In the high-voltage power test, DC high-voltage generators are widely used. Please read the instructions carefully before operating!