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

John Miles jmiles at pop.net
Fri Oct 24 09:12:16 UTC 2008


Along the same lines (and this may have come up before), is there a good
Allan-deviation application for Windows that talks to the 5370B?

-- john, KE5FX

> -----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: Friday, October 24, 2008 2:03 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Measuring ADEV with a PM6681 or CNT-81
>
>
> 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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