[Amps] Hipot questions

[R.Measures]

On Aug 19, 2005, at 7:42 PM, Barrie Smith wrote:

> I've just aquired a 15 KV, commercial hipot tester.  I've tested a few 
> vacuum caps, with varying (I think) results.
>
> There doesn't seem to be a list of acceptable values, as far as 
> leakage current is concerned, easily found.

Vacuum caps flash-over at their max DC V capability and emit a tink 
sound. Typically, 1 to 2 uA of leakage current is observed just below 
this point.  Safe peak RF operating V is about 2/3 of this value.
>
> Several fixed-value vacuum caps tested at their rated voltage with 
> less than 1/10 microamp leakage.  A variable cap, rated at 10 KV, 
> shows 2 microamps at 3.5 KV, and that number was fluctulating.

Fluctuation is typical.
>
> I stopped at that point because I don't know if that figure is high or 
> low.
>
> The unit tests at 0 to 15KV at 2, 20, 200 and 2000 microamps, and has 
> been recently calibrated.
>
> Is there a commonly-available list of acceptable leakage numbers?
>
> TIA,
>
> Barrie, W7ALW
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org