[time-nuts] quartz thermometers

Alan Ambrose alan.ambrose at anagram.net
Fri Mar 11 12:41:43 EST 2016


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


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