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 <[email protected]> wrote: > > On Mon, 21 Jul 2014 04:39:51 -0700 > Alexander Pummer <[email protected]> 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 > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
