FYI: I tend to record all serial (RS232/GPIB/USB/LAN) data from counters, analyzers, receivers, environmental sensors with a precision MJD prefix. This allows both tight correlation among different instruments in the lab and also allows ADEV-like tools to estimate, and then gradually refine to high levels of precision, the actual data rate, during data collection. Yes, it adds a few extra bytes, but it can be valuable information sometimes and storage is cheaper than it was a decade ago.
/tvb ----- Original Message ----- From: "John Miles" <[email protected]> To: "'Discussion of precise time and frequency measurement'" <[email protected]> Sent: Monday, July 08, 2013 2:17 PM Subject: Re: [time-nuts] Question about effect of sample interval on ADEV > No prob! It's a complicated business. > > -- john, KE5FX > Miles Design LLC > > >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] 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 >> _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
