[time-nuts] How to measure Allan Deviation?

Christopher Hoover ch at murgatroid.com
Sun Oct 22 14:23:25 EDT 2006

Didier Juges <didier at cox.net> wrote:
> OK, here is my problem. I do not think it is a unique 
> problem, based on recent mail :-)
> I have read about the Allan Deviation and I understand
> the principle, even though the nuances between the 3 
> basic Allan deviations escape me at the moment, but I
> am sure it will come once I re-read the 

> What I do not have is a procedure. What data do I need
> to feed the software and how do I actually collect the
> data?

Here are two references that I believe you will find useful:

1. http://tf.nist.gov/service/pdf/calibrations.pdf

This one from NIST is especially good for the basics.  It walks you
through an Allan deviation calculation from phase measures.

2. http://www.wriley.com/Techniques.pdf

This is an excellent survey, replete with plenty of references to follow
for more detail.

-- Christopher.


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