[time-nuts] How to properly characterize 32kHz oscillators manually and with a microcontroller?

[Hal Murray]

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.


-- 
These are my opinions.  I hate spam.