From: John Larkin
Subject: Re: Temperature Measurement Stability
Date: Fri, 15 Nov 2002 16:26:47 -0800
Organization: Posted via Supernews, http://www.supernews.com
X-Newsreader: Forte Agent 1.91/32.564
On Wed, 13 Nov 2002 19:19:44 -0500, "Raymond E. Rogers"
>I have a manager problem and would like a good Temperature Measurement
>reference to beat somebody over the head.
>We need to build an instrument that has .15 degC stability across
>instruments and over time; this is at a single fixed temperature 37
>degC. I am trying for the temperature measuring part to be .03 degC
>I am trying to convince somebody that we need to recalibrate annually or
>biannually; or be convinced different. I would like a reference that
>has explicit authoritative statements and hopefully data, concerning the
>long term stability of:
>Glass Encapsulated "Super" thermistors
>Semiconductor temperature sensors, like those used in Dallas
>The last is to be able to make statements about an old instrument that
>is supposed to be 1 degC stable.
>I looked up several books, boy are they expensive.
>-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
>http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
>-----== Over 80,000 Newsgroups - 16 Different Servers! =-----
several people make thinfilm platinum RTDs, nice small ceramic slabs
with a 1K platinum film and a glass overcoat. They're just a couple of
dollars each. Combine that with a few thinfilm resistors in a bridge,
and it should be pretty stable.
Two RTDs and two resistors in a bridge would be twice the fun.