[time-nuts] Measuring short term stability minus linear drift

John Miles jmiles at pop.net
Sat Oct 8 00:46:41 EDT 2011

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-
> bounces at febo.com] On Behalf Of Rick Karlquist
> Sent: Friday, October 07, 2011 9:32 PM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Measuring short term stability minus linear drift
> I want to measure the short term stability of a source
> with substantial linear drift.  I would like some measure
> of stability along the lines of Allan deviation, but I
> only want to measure the "noise" and ignore the "drift".
> AFAIK, ADEV treats linear drift like a form of noise.
> Has this problem been solved before?
> Any ideas?

Use TimeLab, Plotter, Stable32, or any other graphing application that
supports Hadamard deviation.   

Any of these apps will also let you subtract the linear or quadratic trend
from the data itself... but if all you want to do is view ADEV without the
effects of drift, HDEV will do that.

-- john

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