Testing capacitors with a voltage tester, the gear to the rated voltage value of the capacitor, observe the leakage current, as long as the leakage current in the capacitor within the specification, it is qualified, otherwise unqualified.
Voltage tester, according to its role can be called electrical insulation strength tester, dielectric strength tester. Its working principle is: a higher than normal operating voltage added to the insulator of the device under test, for a specified period of time, the voltage added to the top will only produce a very small leakage current, the insulation is better. Program-controlled power supply module, signal acquisition and conditioning module and computer control system consists of three modules of the test system. Selection of voltage withstand meter 2 indicators: the maximum output voltage value and the maximum alarm current value of the value.