What does being 'cooled off by a 10K transient' mean? =3D) David Cary wrote: Dear "Jose S. Samonte Jr.", Chris Cox may be on to something. Chris Cox on 2001-04-12 11:01:25 AM wrote: > armpit temp(a remarkably stable temperature =2E.. > The curve "shape" =2E.. > Does it mimic an RC time constant? Yes, take a bunch of data look at the graph. It always takes about 7 time constants to settle within 1 part in 1000 --= because ln(1000) is roughly 7. In particular, if, hypothetically, the hum= an armpit had a time constant of 1 minute, then when it is cooled by a 10 K transient, it will take about 7 minutes to settle to within 0.01 K of the= final value. Do you see the same response when you warm your probe up slightly above b= ody temperature before measuring ? Since human body temperatures normally change throughout the day (Is that= the ``circadian rhythm'' ?), I would much rather use a fixed reference. I kno= w several people who test their thermocouples by dropping them in icewater,= which is always very close to 0 C. Maybe you could try sticking your probes to the outside of a metal can of= icewater. (Or would plastic more closely emulate a human body ?) -- David Cary -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads ____________________________________________________________________ Get free email and a permanent address at http://www.netaddress.com/?N=3D= 1 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.