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

[Jeremy Nichols]

Do we know what this “Long Term Aging Process” is or is it proprietary?



On Sat, Sep 26, 2020 at 5:03 PM Bruce Griffiths <bruce.griffiths at xtra.co.nz>
wrote:

> 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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> --
Jeremy Nichols
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