www.delorie.com/archives/browse.cgi | search |
X-Authentication-Warning: | delorie.com: mail set sender to geda-user-bounces using -f |
X-Recipient: | geda-user AT delorie DOT com |
DKIM-Signature: | v=1; a=rsa-sha256; c=relaxed/relaxed; |
d=gmail.com; s=20120113; | |
h=mime-version:in-reply-to:references:date:message-id:subject:from:to | |
:content-type; | |
bh=7agtnmC3uEW9FqddhOCfm7RWlUqJymGRw+kKOCi9l4Y=; | |
b=gqVSkYVoJkXSIUBzEE02r5f1X3EZ34K+3zO7WzvwdO/cit3q54pjliFMpDBetzaDhm | |
YGXfimTOAROwg5HjkS+8Xf5o10pgb1zoH/8sTkyI6HHuoTQhoG4TpAXWPtu53F01kB7i | |
lMeSU21Fh9RnBLeqnLFMORWaAragKo425ZUA/vGP41weB7/x6Ega3qD8hKc9vjECt40D | |
BMVkK2k83gRyOcBjBvKQVr+jOPwsjOucEe/f1w/qmSlImj+HAVRoIsTvShDl0gqQmX1N | |
KB2KjY39/UZ0vLbQ0kw95uFMQ0q+nTur1qIEp+VjSUVYsPuCwOx4NDnR3W0ARFenjZEe | |
I5hQ== | |
MIME-Version: | 1.0 |
X-Received: | by 10.43.29.208 with SMTP id rz16mr10889386icb.89.1425654729433; |
Fri, 06 Mar 2015 07:12:09 -0800 (PST) | |
In-Reply-To: | <CAM2RGhS_=rQL1UyMg8xixfOsrXq=AhZ__S70ijhSi=pLg=ZjQQ@mail.gmail.com> |
References: | <CAF3uCZ=G0FztqBtpfvssYCz9WrUORX8+J45xmH9+KutaX6c+gw AT mail DOT gmail DOT com> |
<201503051621 DOT t25GL09H018380 AT envy DOT delorie DOT com> | |
<CAF3uCZnSwMfNTVybJ+U89RTOk5=B+5FSSci1tD2nW9Ywo9Armg AT mail DOT gmail DOT com> | |
<CAM2RGhS_=rQL1UyMg8xixfOsrXq=AhZ__S70ijhSi=pLg=ZjQQ AT mail DOT gmail DOT com> | |
Date: | Fri, 6 Mar 2015 10:12:09 -0500 |
Message-ID: | <CAOuGh88R7n51XJwDMnn4e8SxdZNgF4cJDzWqjX4m5mr0sQt3=w@mail.gmail.com> |
Subject: | Re: [geda-user] [OT] Temperature sensor and control recommendation |
From: | Bob Paddock <graceindustries AT gmail DOT com> |
To: | geda-user AT delorie DOT com |
Reply-To: | geda-user AT delorie DOT com |
Errors-To: | nobody AT delorie DOT com |
X-Mailing-List: | geda-user AT delorie DOT com |
X-Unsubscribes-To: | listserv AT delorie DOT com |
On Fri, Mar 6, 2015 at 9:55 AM, Evan Foss <evanfoss AT gmail DOT com> wrote: > Why is everyone assuming this should be done digitally? Tradition? "The synchronous detectors were used in temperature monitors and temperature controllers designed to control temperatures on spacecraft at 60 milliKelvin +/- a few ucroKelvin. The preamplifier had to have a gain of 10E5 after which the demodulated signal had to be converted by a 16 bit ADC, with +/- 1LSB allowable error.... so of course, you can see that we were working with extremely small signals buried in the noise, and we had to go all out in an effort to beat down the noise. That's why we had to use a new improved synchronous demodulator. This project was as close to being impossible as you can get! I still have trouble believing that we actually made it work." -- John Sutton of NASA : https://web.archive.org/web/20120607001807/http://www.unusualresearch.com/Sutton/sutton.htm
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |