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

peterawson at earthlink.net peterawson at earthlink.net
Fri Oct 24 09:07:34 UTC 2008


When you have your question about ADEV & the PM6681 answered, would
be so kind as to share the answer with us?

Pete Rawson

-----Original Message-----
>From: Tom Duckworth <tomduck at comcast.net>
>Sent: Oct 23, 2008 10:19 PM
>To: 'Discussion of precise time and frequency measurement' <time-nuts at febo.com>
>Subject: Re: [time-nuts] Measuring ADEV with a PM6681 or CNT-81
>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 Duckworth
>-----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
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