[time-nuts] Fast frequency counting question

[John Miles]

> Probably impractical as the sampling noise is so high that it will
> require  tens of thousands of measurements to get the noise down to the
> required level and meanwhile the temperature etc will have changed
> significantly.

Heh, that's a good point, you can't just sit there and trigger the thing
10,000 times per second for 24 hours...

> Also the relatively low ADC resolution and nonlinearities
> will tend to limit the effective resolution in determining the zero
> crossing locations.

I stand by my assertion, though, that all you're going to get with high
sampling precision is a lot of well-characterized random noise determined
almost solely by outside factors.  It's an interesting question, but one
that can't be answered without knowing more about the symptom that started
the whole thread.

-- john, KE5FX