MICROTEST HI POT Tester 7631/7630- Insulation Resistance 12GΩ

MICROTEST HI POT Tester 7631/7630
ACW 5000V/DCW 6000V/ Insulation Resistance 12GΩ

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AC/DC Withstanding Voltage Test

AC Hi pot Test
Most DUT have parasitic capacitance. With AC test, might not able to charge the parasitic capacitance. Therefore, this will create constantly current go through.

DC Hi pot Test
The parasitic capacitance will be charged under DC hi-pot test. Therefore, the current will reduce to almost 0.

Hi-pot Test Time
The testing voltage is refer to the condition of DUT while doing Hi-pot test. If the voltage setting is too low, the insulation material defect might not be detected. If the voltage setting is too high and the testing time is too long, it may cause the permanent damage for the material.

Normally setting for the safety standard.
Formula →Testing Voltage= DUT recommend voltage × 2+1000V
EX : DUT standard :240V →Setting test voltage:1480V

Common way to safe time for testing
Testing time for most products is 60s. If there are more than one test on one item, it will cost a lot of time. This will lower the efficiency og the product line.

Therefore, the product line usually shorter the testing time to 1~2 sec. and higher 10%~20% testing voltage.

Insulation Resistance Test
VDE and TUV safety standard request insulation resistance test for some specific product before hi-pot test. The reason is to make sure the insulation will not be damaged while doing hi-pot testing. Insulation resistance test is the key item to evaluate the material.

Hi-pot test is judge by leakage current, but IR test is judge by resistance, and usually it’s higher than 1 MΩ. It tests the DUT’s resistance between both terminal.