Second thought, look at the tau=1 to 10 s and you see that it first
rises before the usual slope. This is the effect of averaging in the
counter. I would suspect that a HP53132A is being used.
Magnus,
You're correct about averaging effects; for example, see:
Tom Van Baak pisze:
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
That data represents a beat note between two optical frequencies: Nd:YAG
laser stabilized to hyperfine transitions of molecular iodine and
optical frequency comb that is phase locked to the SRS FS-725 rubidium
standard. And it seems that AVAR of this measurement is lower than
values for
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.
Filip Ozimek wrote:
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
-
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
Filip Ozimek wrote:
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
: 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
-boun...@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
