[time-nuts] Question about effect of sample interval on ADEV

John Miles john at miles.io
Mon Jul 8 17:17:52 EDT 2013


No prob!  It's a complicated business.

-- john, KE5FX
Miles Design LLC


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Robert Darby
> Sent: Monday, July 08, 2013 5:48 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Question about effect of sample interval on ADEV
> 
> John,
> 
> After a night's sleep and a rereading of  your post I finally realized
> what I was doing wrong.  I did not understand the the role of the
> sampling interval setting and the display rate setting on the 5370.
> When I follow the process below the results are totally consistent.
> 
> Sorry to taken your time and thanks all for your help.  Now to find the
> original issue.....
> 
> Bob Darby
> 
> On 7/7/2013 8:57 PM, John Miles wrote:
> > So the only difference between the test setups is the setting of the
> > Display Rate control on the 5370, correct? You're allowing TimeLab to
> > estimate the sample rate automatically, and giving it enough time to
> > converge on a stable reading before hitting 'Start Measurement'?
> > You're correct in that changing the real-world sample rate should
> > yield results that are identical (or at least very similar) to
> > resampling the phase data after the fact. In frequency mode, dead time
> > between readings would make that an iffy proposition, but for data
> > taken in TI mode the outcomes should be close. -- john, KE5FX Miles
> > Design LLC
> 
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