The withstand voltage test, also known as high voltage test or dielectric strength test, may be the most familiar and used in product process safety testing.

The withstand voltage test is a non-destructive test used to test the insulation of a product under transient high voltage that are frequently encountered. It applies high voltage to the equipment under test for a certain period of time to ensure that the insulation performance of the equipment is strong enough.

Test voltage, most safety standards allow the use of AC or DC voltage in the withstand voltage test. If an AC test voltage is used, the insulator to be tested is subjected to the maximum pressure when the voltage peak is reached, whether it is a positive or negative peak. Therefore, if you decide to use the DC voltage test, you must ensure that the DC test voltage is twice the AC test voltage so that the DC voltage can be equal to the AC voltage peak. For example: 1500V AC voltage, for the DC voltage to generate the same amount of electrical stress must be 1500 x 1.414 that is 2121V DC voltage.

The advantage of the AC withstand voltage test is that it can detect all voltage polarities, which is closer to the practical situation. In addition, since the AC voltage does not charge the capacitor, in most cases, it is not necessary to gradually boost, and a corresponding voltage can be directly output to obtain a stable current value. Also, after the AC test is completed, no sample discharge is required.