John,
You can convert frequency to phase (time interval)
using fr2ti under www.leapsecond.com/tools/
/tvb
----- Original Message -----
From: "John Miles" <jmi...@pop.net>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>
Sent: Sunday, January 10, 2010 3:04 PM
Subject: Re: [time-nuts] AVAR calculation
Ulrich's PLOTTER application is a good tool for that; mine doesn't support
frequency input yet. If you haven't tried PLOTTER, it's the second download
on the page at http://ulrich-bangert.de/html/downloads.html . Be sure to
select "Data is frequency" from the Time Stability Statistics menu.
-- john, KE5FX
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Tom Van Baak
Sent: Sunday, January 10, 2010 2:01 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] AVAR calculation
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_su...@o2.pl>
To: <time-nuts@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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