[time-nuts] AVAR calculation

[Tom Van Baak]

John,

You can convert frequency to phase (time interval)
using fr2ti under www.leapsecond.com/tools/

/tvb

----- Original Message ----- 
From: "John Miles" <jmiles at pop.net>
To: "Discussion of precise time and frequency measurement" <time-nuts at 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-bounces at febo.com [mailto:time-nuts-bounces at 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_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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