[time-nuts] AVAR calculation

John Miles jmiles at pop.net
Sun Jan 10 23:53:50 UTC 2010


Yep, it's just a matter of laziness on my part.  Frequency input is one of
several dozen items that were on my to-do list when I got sidetracked with
the ADCs, and which are almost all still there...

-- 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 3:09 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] AVAR calculation
>
>
> 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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