[time-nuts] time-nuts Digest, Vol 43, Issue 35
Martyn Smith
martyn at ptsyst.com
Thu Feb 14 12:36:02 EST 2008
Pete,
That's my point.
Tom has plotted Allan Variance. I have plotted frequency accuracy.
I get similar Allan Variance results to Tom. But if I just measure the
accuracy, e.g peak to peak frequency variations, rubidium's out- perform
OXCO's even when both are disciplined to GPS.
I hope I'm not being stupid here.
I measure frequency accuracy using my Stanford SR620 in time AB mode and
calculate the frequency error. My accuracy floor noise is 2E-11/sec.
When measuring an OXCO based unit I often get frequency errors of plus/minus
5 milli hertz. Rubidium units (mine and Symettricom) never has errors > 1
milli hertz.
Best Regards
Martyn
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