[Amps] Vacuum variable hipot

[Randall, Randy]

You should really see 0uA.  Run it through its range and stop on the positions that have leakage.  Drop it to 4 KV and let it cook.  You might be able to effect a repair if it is gas as the arc will getter to some extent or the arc may help clear the leakage path.  It could very well make it worse.  You have nothing to lose at this point.

Randy AB9GO

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On Behalf Of Steve
Sent: Friday, September 18, 2009 7:03 AM
To: amps at contesting.com
Subject: [Amps] Vacuum variable hipot

I have a Jennings UCSL1000 - 1000pF, 5kV cap. If I put 5kV dc across it
and run it through its tuning range, the leakage current is sometimes
zero but fluctuates and there are places where the current leaps up to
50uA. At those points the current falls to zero if the voltage is
reduced to around 4kV, although I have heard a couple of arc 'pops' from
it sitting there at 4kV.

At other settings where the current is lower, 5uA or less, the leakage
dies away to zero if I leave it sitting there for a while.

Is this normal behaviour? Is this one a duffer?

Thanks,

Steve
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