Re: Detecting currents less than one femtoamp?
From: Boris Mohar (borism_-void-__at_sympatico.ca)
Date: 10/10/04
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Date: Sun, 10 Oct 2004 08:58:20 -0400
On Sun, 10 Oct 2004 01:44:06 -0700, "Watson A.Name - \"Watt Sun, the Dark
Remover\"" <NOSPAM@dslextreme.com> wrote:
>
>"Greysky" <greyskynospam@sbcglobal.net> wrote in message
>news:hjt8d.6675$nj.2550@newssvr13.news.prodigy.com...
>> Anyone know of a reliable way of detecting currents less than one
>femtoamp
>> i.e. 1X10^-16 amp full-scale? I figure to perhaps use some
>instrumentation
>
>Let's see..
>1 mA = 10^-3
>1 uA = 10^-6
>1 nA = 10^-9
>1 pA = 10^-12
>1 fA = 10^-15 _not_ 10^-16!
>
He said LESS than 1fA. 10^-16 is 100 attoamperes
It is doable with discrete front end of I/V op amp configuration. I used
3N155
--
Boris Mohar
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