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From: Boris Mohar
Subject: Re: Low leakage parts
References: <email@example.com> <3E17D633.378A@sneakemail.com> <3E184B38.588B@sneakemail.com> <firstname.lastname@example.org> <3E186B3C.5BA0@sneakemail.com> <email@example.com> <3E18805E.4AA@sneakemail.com> <firstname.lastname@example.org> <3E1B0A5C.1A70@sneakemail.com>
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Date: Tue, 07 Jan 2003 19:12:55 -0500
NNTP-Posting-Date: Tue, 07 Jan 2003 19:16:28 EST
Organization: Bell Sympatico
On Tue, 07 Jan 2003 12:11:56 -0500, Mike Monett
>Boris Mohar wrote:
>> This was for measuring Tritium in air. It was important that once the
>> instrument was zeroed that it stayed zeroed. Speaking of zeros, to my
>> dismay I discovered that some high value resistors have a non linear
>> voltage coefficient. At very low voltage drops the value of one Tohm
>> resistor start to go through the roof. So just as you zero your
>> electrometer your feedback resistor value increases making it even harder
>> to zero.
>> Boris Mohar
>> Viatrack Printed Circuit Designs
>Amazing. How do you measure the value of a 1T resistor at low voltages?
By using a better electrometer, Keithley 614 as a voltage source and a
current meter. It can measure 1x10-14A. Better than I ever could.
Viatrack Printed Circuit Designs
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