[Amps] Vacuum variable hipot

[Carl]

Its something to do with zapping off whiskers iff'n I recall correctly. 
Similar to what Eimac does with "real tubes"

Carl
KM1H


----- Original Message ----- 
From: <donroden at hiwaay.net>
To: <amps at contesting.com>
Sent: Friday, September 18, 2009 12:17 PM
Subject: Re: [Amps] Vacuum variable hipot


> Can you "really" cook a vacuum ??
>
> I have never heard of a getter function being available.
>
> Don WA4NPL
>
>
> Quoting Carl <km1h at jeremy.mv.com>:
>
>> 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 at healthall.com>
>> To: "'Steve'" <g8gsq at f2s.com>; <amps at 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 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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