As I recall, that proper technique is to test the caps at the fully meshed
(max capacitance) position.
Steve (WG7K)
----- Original Message -----
From: "R.Measures" <r@somis.org>
To: "Barrie Smith" <barrie@centric.net>
Cc: <amps@contesting.com>
Sent: Saturday, August 20, 2005 3:36 AM
Subject: Re: [Amps] Hipot questions
>
> 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
>
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