I swear I started a similar thread here on this mailing list, many years ago, but google is not helping me find it. Maybe it was well over a decade ago and on a Usenet group?
>From that thread, I remember learning that retrace/hysteresis quickly becomes the limiting factor for quartz thermometers. e.g. http://www.ieee-uffc.org/frequency-control/learning/Hysteresis_final.html http://www.ieee-uffc.org/frequency-control/learning/hysteresis/fig_3.gif Tim N3QE On Fri, Mar 11, 2016 at 12:41 PM, Alan Ambrose <alan.ambr...@anagram.net> wrote: > Hi, > > I hope this is still relevant and not too off-topic...but since it > involves crystals and tempco... > > Quartz thermometers (e.g. the HP 2804A) with their 'linear cut' crystals > and '0.0001C resolution' seem to have been a thing from the mid-60's to the > mid-80's: > > http://www.hparchive.com/Journals/HPJ-1965-03.pdf > > There still appear to be some manufacturers making the crystals: > > http://www.statek.com/products/pdf/Temp%20Sensor%2010162%20Rev%20B.pdf > > Anyone know why they died out? Did a better technology replace them? > > TIA, Alan > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.