Re: How to measure really small voltages
From: Jim Yanik (jyanik_at_abuse.gov)
Date: 08/04/04
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Date: Wed, 4 Aug 2004 02:30:11 +0000 (UTC)
alan <no-longer-valid@yahoo.com> wrote in
news:cep0dm$qgs$1@news.Stanford.EDU:
> A fellow lab-mate wants to measure a DC signal in the uV or nV range,
> while the sample is at low temperatures. That means that there are
> going to be a few hundred pF of capacitance due to wiring, plus
> thermo-electric offsets due to the temperature difference. He was
> thinking of using some kind of low temperature transistors to do some
> kind of switching at the low temperature end, and then use a lock-in to
> measure the amplitude of the square wave. For now, assume that the
> sample source resistance is fairly high. Is there a better way to
> measure this small voltage?
Keithley makes femtovoltmeters,are knowledgeable about measuring accurately
extremely small voltages,currents,or charges.They may have publications or
app notes about such measurements and what errors may arise.
-- Jim Yanik jyanik-at-kua.net
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