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From: Boris Mohar
Subject: Re: Low leakage parts
References: <email@example.com> <8npR9.16063$jM5.firstname.lastname@example.org> <email@example.com> <3E17D633.378A@sneakemail.com>
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Date: Sun, 05 Jan 2003 08:36:41 -0500
NNTP-Posting-Date: Sun, 05 Jan 2003 08:40:06 EST
Organization: Bell Sympatico
On Sat, 04 Jan 2003 22:52:35 -0800, Mike Monett
>Boris Mohar wrote:
>> Surface contamination is easily activated by damp air. Memories of one
>> humid summer when we had a batch of 1fA ionization chamber electormeters
>> misbehave. Humid air by itself is not conductive. Ionized air dry or
>> humid is a different story.
>> Boris Mohar
>> Viatrack Printed Circuit Designs
>Boris, can you tell how you cleaned the chambers to achieve low enough
>leakage to measure 1fA?
There was only one part to clean was large glass feed through that
supported the collection electrode. The chambers were polished nickel and
were cleaned with deionized water and alcohol. We actually had very
little problems with leakage once the electormeter was encapsulated in
wax. The only insulating part exposed to humidity was the outer surface
of the glass feed through. The feed through support ring was grounded.
Do you know of any good subs for 3N155A?
Viatrack Printed Circuit Designs
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