[time-nuts] Casio Watches 13 Year Drift in Seattle

Andy AI.egrps+tn at gmail.com
Tue Jun 30 16:42:29 EDT 2015

Measuring a 32kHz frequency to ~100 PPB accuracy takes some time, even for
ATE.  Time is money.

I didn't think the hardware to do the computations and the digital offset
was any problem.  I thought the temperature and voltage sensors might be,
since they are analog.  But you can integrate them into a good mixed
technology IC process.  I just didn't think that was what they are using.


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