Measuring the withstand voltage is an experiment to test the ability of insulation to withstand working voltage or overvoltage, and to check the insulation manufacturing or maintenance quality of electrical equipment, so withstand voltage tester is needed.
The best way to determine the test voltage is to set it according to the specifications required for the test. Generally speaking, we will set the test voltage according to twice the working voltage plus1000 V. For example, if the working voltage of a product is 220VAC, we will use 2x 220+ 1000 = 1440v as the test voltage.
Of course, due to different insulation levels, the test voltage will be set differently. For products with "double insulation" design, the test voltage used may be higher than the standard of 2 X working voltage+1000 V. The test voltage of such products may be between 1000 V and 4000V or higher.
This is the demand of the safety verification unit. This is to ensure that the test instrument has enough output current to test the high capacitance load correctly. However, the output current of these instruments sometimes exceeds 100 mA, so there is considerable potential danger. Therefore, some UL standards also mention that the output voltage can be stabilized at a voltage.
You don't need to get 500VA high voltage test equipment, but whether you need 500VA high voltage test equipment or not, it is the right choice according to the standard requirements of your products.