[time-nuts] How to properly characterize 32kHz oscillators manually and with a microcontroller?
Hal Murray
hmurray at megapathdsl.net
Mon Jun 27 17:45:29 EDT 2016
time at patoka.org said:
> For very long time, may be Main Frequency (60 Hz) could be utilised. Say,
> MCU could count and compare Zero-Crossings and impulses from DS32xx chips.
> After several days, you'll see where it goes.
Power in Silicon Valley isn't stable enough to make that approach interesting.
Here is the long range view:
http://users.megapathdsl.net/~hmurray/time-nuts/line/Calif-60Hz-2014-2015.pn
g
http://users.megapathdsl.net/~hmurray/time-nuts/line/Calif-60Hz-2015-Jul.png
If you average over long enough to smooth out the daily wobbles, you run the
risks of hitting one of their big shifts.
25 seconds over 3 days is almost 100 PPM.
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