[time-nuts] Allan Deviation Calulations
Magnus Danielson
magnus at rubidium.dyndns.org
Thu Sep 22 12:44:02 UTC 2011
Sqrt(adev_meas^2-adev_ref^2) should do it, but you are close to the floor so confidence bounds will have to be small for meaningfull values.
Cheers,
Magnus
Martyn Smith <martyn at ptsyst.com> skrev:
Hello,
I'm trying to measure the Allan Deviation of an amplifier and need help with
the maths.
My measurement process uses the SR620 in time interval mode and I make one
measurement per second for about a day.
I then use Ulrichs excellent plotter to calculate the Allan Deviation.
The Allan Dev floor noise of the SR620 (without my amplifier) is as follows.
9.91E-13 (1 second)
1.59 E-13 (10 sec)
3.00 E-14 (100 sec)
I then add my amplifier into the measurement process. I get the following
Allan Dev results
1.09E-12 (1 sec)
2.48E-13 (10 sec)
4.32E-14 (100 sec).
So the 1 sec Allan dev with my amp included, has gone up by 9.9E-14 for the
1 sec measurement.
How to I calculate the actual Allan Dev of my amp for the 1 sec period?
Best Regards
Martyn
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