[time-nuts] Watch Crystal Aging Rates

Brooke Clarke brooke at pacific.net
Fri Apr 20 23:02:16 UTC 2007


Hi:

I've heard that the aging rate of crystals gets better as the frequency gets 
lower.  The idea is that the more mass in the crystal the less an atom here or 
there will be missed.  So the 32768 Hz watch crystals should be very good 
compared to a 10 Mhz crystal.

Does anyone have any data on watch crystal aging?

If there was a known aging rate then it could be backed out in the countdown 
circuit resulting in much better accuracy.

Have Fun,

Brooke Clarke
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com






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