[time-nuts] Measuring ADEV with a PM6681 or CNT-81

Heinzmann, Stefan (ALC NetworX GmbH) Stefan.Heinzmann at alcnetworx.de
Fri Oct 24 09:03:11 UTC 2008


Thanks, Tom!

Apart from the specifics with TimeView, how does one go about measuring ADEV with a counter that does have a dead-time? Are there tricks that can be played, either with a special measurement setup or with some data postprocessing? Or with two counters that are somehow made to cooperate?

Sorry if I'm asking the obvious, you can see that I'm a greenhorn. ;-)

Cheers
Stefan

-----Ursprüngliche Nachricht-----
Von: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] Im Auftrag von Tom Duckworth
Gesendet: Donnerstag, 23. Oktober 2008 22:19
An: 'Discussion of precise time and frequency measurement'
Betreff: Re: [time-nuts] Measuring ADEV with a PM6681 or CNT-81

Stefan,

I am retired from Pendulum Instruments and could answer your question but I
have instead refered your question to a current engineer with the company
and you should receive an answer from them shortly. They are the experts for
this question.

Tom
Tom Duckworth
510-886-1396


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Heinzmann, Stefan (ALC NetworX GmbH)
Sent: Thursday, October 23, 2008 10:12 AM
To: time-nuts at febo.com
Subject: [time-nuts] Measuring ADEV with a PM6681 or CNT-81

Hi all,

I hope you can clear up some confusion that I have regarding ADEV
measurement. I was under the impression that you need a counter that is able
to timestamp each rising edge of the clock under test, or equivalently
measure period time continuously with no dead time. Now, while the CNT-90
can do this, the CNT-81 ( = PM6681 ) can't. Still, a message last December
to the list here
(http://www.mail-archive.com/time-nuts@febo.com/msg10963.html) seems to
indicate that using TimeView you can have ADEV plotted with the "lesser"
model, too. I have a PM6681 and TimeView, but I couldn't find out how to do
it. Maybe it can't be done.

So what's the deal on this? Can it be done, with or without TimeView, and if
yes, how? If this has been answered earlier, a link would be just fine.

Thanks and cheers
Stefan

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