[time-nuts] What do people use for measuring temperature?

[Bruce Griffiths]

Drift ~1-2mK per year for suitably conditioned thermistors at 25C:
https://www.littelfuse.com/technical-resources/technical-centers/temperature-sensors/thermistor-info/thermistor-terminology/stability.aspx

Bruce
> On 27 September 2020 at 11:15 Bob kb8tq <kb8tq at n1k.org> wrote:
> 
> 
> Hi
> 
> Roughly speaking 99.99999% of all OCXO’s use thermistors as temperature sensors. 
> The normal evaluation process on a new one *probably* would catch something < 0.01C
> over a few months. You may do it a couple different ways depending on the target
> OCXO. The net result is still in the “golly gee wiz low” sort of range. If you can detect a 
> drift / shift, you disqualify that part and move on to another one. Very few glass bead 
> parts seem to get tossed out …..
> 
> Bob
> 
> 
> 
> > On Sep 26, 2020, at 4:23 PM, John Ponsonby <jebponsonby at gmail.com> wrote:
> > 
> > Have any time-nuts got any data on the long term stability or drift rates/ageing characteristics of thermistors? I am concerned with  ability of holding temperature constant at the milliK level for years. I reckon that if one can measure it one can control it. Conversely if one can't measure it, because of the instability of the sensor,  one can't control it.
> > John Ponsonby
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