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From: Mike Monett
X-Mailer: Mozilla 2.02 (Win16; I)
Subject: Re: Low leakage parts
References: <email@example.com> <8npR9.16063$jM5.firstname.lastname@example.org> <email@example.com> <3E17D633.378A@sneakemail.com>
Date: Sun, 05 Jan 2003 10:11:52 -0500
NNTP-Posting-Date: Sun, 05 Jan 2003 10:11:21 EST
Organization: Bell Sympatico
Boris Mohar wrote:
> On Sat, 04 Jan 2003 22:52:35 -0800, Mike Monett
> >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.
Anything special about the alcohol? Some have mentioned that plain
store-bought isoprop is unsuitable, but I've cleaned keyboard switches
with it and they measured over 1 gigohm, which is the top range on the
>We actually had very
> little problems with leakage once the electormeter was encapsulated in
You mentioned this before. Where do you get it, and how do you ensure it
is not contaminated? Any there special precautions in applying it, like
disposable rubber gloves?
>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?
That was my next question - what input device do you use. I can't even
find a datasheet on it, but perhaps the 2N7000 that Win and John are
playing with might be suitable.
> Boris Mohar
> Viatrack Printed Circuit Designs
Thanks for the good info!
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