[time-nuts] Phase, One edge or two? (was Digital mixing with a D Flip Flop)
hmurray at megapathdsl.net
Wed Oct 22 21:57:47 UTC 2014
tvb at LeapSecond.com said:
> 2) For long-term analysis, even 1 PPS is overkill. Having more data may not
> improve your oscillator drift plot at all. This is because the frequency is
> a moving target. Ever more precise measurements of a moving target are
> wasted; they don't add any clarity to the overall trend. Consider measuring
> a 10811 for a year. Do you need to follow its phase or frequency every 100
> ns? Or second? Or minute? Maybe as little as one data point per day is more
> than enough to make a perfectly accurate long-term frequency drift plot.
You need more than 1 sample per day for ADEV plots left of 100,000 K seconds.
Suppose you have lots and lots of data at, say, 1 second samples. You can
turn that into an ADEV plot. Does anybody scan the data in clumps, say a
day, to see if the short-tau picture changes over time?
These are my opinions. I hate spam.
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