[time-nuts] How to properly characterize 32kHz oscillators manually and with a microcontroller?
Hal Murray
hmurray at megapathdsl.net
Mon Jun 27 21:20:14 EDT 2016
danrae at verizon.net said:
> Maybe, but simply by adjusting mine by measuring the 32 kHz output with an
> accurate counter I can get them to keep to within about one second a month.
What did you adjust? I assume it's software.
How well do typical VCO adjustments work with tuning forks?
My sample runs about 2 ppm fast but it's stable with 0.2 ppm peak-peak.
http://users.megapathdsl.net/~hmurray/time-nuts/Temp-tcxo32khz-a.png
danrae at verizon.net said:
> I doubt that any of the fancy schemes being proposed for measurement will
> improve the basic accuracy much.
I assumed the discussion was for the fun of measuring something rather than
than trying to make it significantly better.
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