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 <kb...@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 <jebponso...@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 > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
