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

[Hal Murray]

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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