This thread brings up a question Ive had for awhile. When hi potting a
vacuum variable is it better to use AC or DC for the cooking?
Ive a surplus shop commercial unit that goes to 15 kV in 3 ranges and with
selectable current limiting. I havent used it for anything but testing
transformer insulation so far.
Carl
KM1H
----- Original Message -----
From: "Randall, Randy" <Randy.Randall@healthall.com>
To: "'Steve'" <g8gsq@f2s.com>; <amps@contesting.com>
Sent: Friday, September 18, 2009 9:51 AM
Subject: Re: [Amps] Vacuum variable hipot
> 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@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Steve
> Sent: Friday, September 18, 2009 7:03 AM
> To: amps@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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