[Amps] Hi pot test - normal leakage current of vacuum cap

[Larry Benko]

  Is your Hi-Pot tester a DC tester or does it have some AC on it?  The 
reactance of 1000pF at 50Hz is 3.2M ohm and a 10kV rms (14kV peak) AC 
only Hi-Pot would result in 3.1mA due to the capacitive reactance only.  
The 50uA you are seeing could easily be due to some small AC ripple on 
your tester.

73,
Larry, W0QE

On 10/8/2011 7:05 AM, LB3HC wrote:
> Hi experts! I have hipot tested a 1000pF UR4LL vacuum capacitor today.
> It did clunk a couple of times at approx 4 kV and then it settled
> down. The it clunked a couple times at 8 kV and settled down. Now it
> handles 14 KV without any internal arc overs. However... it draws
> approx 50 uA leakage current @ 14KV. Is that normal or do I have a bad
> vacuum (gassy cap) here?
>
> 73
> LB3HC
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