[time-nuts] temperature sensor

Bill Dailey docdailey at gmail.com
Mon Jul 21 12:43:25 EDT 2014

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 <attila at kinali.ch> wrote:
> On Mon, 21 Jul 2014 04:39:51 -0700
> Alexander Pummer <alexpcs at 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
> -- 
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