I use AC when it's required by standard. I also have used it on simple devices
such as transformers. However I have changed some large SMPS transformers back
to DC testing due to the high capacitive current load on the tester.
A number of years ago I changed the routine test from AC to DC on switch mode
power supplies. The increased first pass yield demomonstrated that the 60Hz
Dielectric test was causing failures in about 1-2% of the units tested.
Your results will depend upon how well you can control the displacement currents
during the test.
John Merrill
Schneider Automation
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