the broiling temperature is dependent of the atmospheric pressure! the
water broils at 100C° only a see level!
73
Alex
On 7/21/2014 11:56 AM, Alan Melia wrote:
er not boiling water....steam. Water's boiling point is affected by
the dissolved gasses and other contaminants.
Alan
G3NYK
----- Original Message ----- From: "Bill Dailey" <docdai...@gmail.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Monday, July 21, 2014 5:43 PM
Subject: Re: [time-nuts] temperature sensor
Ice water and boiling water coupled with altitude will give you two
points.
Sent from mobile
On Jul 21, 2014, at 10:12 AM, Attila Kinali <att...@kinali.ch> wrote:
On Mon, 21 Jul 2014 04:39:51 -0700
Alexander Pummer <alex...@ieee.org> wrote:
NTC are not that very stable, they are amorphous material winch could
recrystallize slowly and therefore change it's electrical behavior ,
PT100 style is more reliable since it is pure metal
How long is the time constant for NTCs?
I guess, it wouldn't matter for most of the measurements we do,
as NTCs need to be "calibrated" before precision measurements
anyways. Unless one measures over several months, or years.
But on this timescales, i wouldn't really trust an off the shelf
PT100 either. Not unless i measure its stability
For use in GPSDOs and OCXOs, i guess it doesn't really matter,
as long as the NTC stays within spec. There an external loop
corrects for the variation/drift of the measurement.
While we are at it: what is a good way to calibrate/characterize
temperature sensors that is available to hobbyists?
Attila Kinali
--
I pity people who can't find laughter or at least some bit of
amusement in
the little doings of the day. I believe I could find something
ridiculous
even in the saddest moment, if necessary. It has nothing to do with
being
superficial. It's a matter of joy in life.
-- Sophie Scholl
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