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Discussion of precise time and frequency measurement

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Re: [time-nuts] accurate 60 hz reference chips/ckts

HM
Hal Murray
Fri, Dec 15, 2017 3:10 AM

For GPS and OCXO the choice of time constant is fairly obvious. But the
ADEV for mains frequency isn't quite as pretty. So I'm not sure several
hours would work; maybe more like days or weeks? Here's a sample ADEV for
power line frequency:

Has anybody investigated what the ADEV looks like if you plot something like
one hour samples over a day?  That is is the ADEV in the morning when the
temperature is warming up the same as the ADEV in the evening when the
temperature is cooling off?

--
These are my opinions.  I hate spam.

tvb@LeapSecond.com said: > For GPS and OCXO the choice of time constant is fairly obvious. But the > ADEV for mains frequency isn't quite as pretty. So I'm not sure several > hours would work; maybe more like days or weeks? Here's a sample ADEV for > power line frequency: Has anybody investigated what the ADEV looks like if you plot something like one hour samples over a day? That is is the ADEV in the morning when the temperature is warming up the same as the ADEV in the evening when the temperature is cooling off? -- These are my opinions. I hate spam.