1000V capacitors

[ppppenguin]

For high voltage caps my quick and dirty test is a 500V Megger. If any cap from 350V up shows any leakage then it's duff. My main bench HT PSU, a Solartron SRS153, does 0-600V on a good day with the wind behind it. For higher voltage I've got an old Unilab 5kV PSU. That with a DMM on uA range and a 1M limiter resistor does the job nicely. The internal resistance of the supply is high enough that the 1M resistor isn't really needed.