[time-nuts] AVAR calculation

[Tom Van Baak]

Hi Filip,

See attached. Let me know how your results differ from this.

It looks like 1.75 hours of frequency data of a 250 MHz DUT.

You first convert your raw frequency measurement data into
normalized frequency error data (i.e., subtract and divide by
f0 = ~250 009 770 Hz).

You can run the y- form (frequency) of an adev calculation
directly, or integrate the frequency error series into a time
error series and run the x- form (phase) of adev calculation.

I can explain more if you wish.

JohnM and UlrichB can double check this plot with their tools.

/tvb

----- Original Message ----- 
From: "Filip Ozimek" <me_super at o2.pl>
To: <time-nuts at febo.com>
Sent: Sunday, January 10, 2010 1:20 PM
Subject: [time-nuts] AVAR calculation


>
> I'm trying to calculate AVAR from collected data, but I would expect a different behavior of my DUT. Does anybody can 
> calculate the AVAR for me?
> Gate time was 1s, without any deadtime between measurements,
> this is a file http://www.fuw.edu.pl/~fozimek/pomiar61-frep.txt
> with collected data.
>
> Thanks,
>
> Filip Ozimek
> 
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