Hi I do not see it on my 5370’s but that is hardly a conclusive answer to the question. There are a number of adjustments involved in aligning the beast. There is also the variable of how far off frequency the internal standard is. I do not normally use the internal reference on any of my counters for anything other than a cleanup oscillator. I seem to have … umm …. errrr …. several … GPSDO’s and Rb’s to pick between. There is no real reason to run on the internal standard when “something better” is available.
Bob > On May 14, 2015, at 12:11 PM, Bob Stewart <[email protected]> wrote: > > Hi Bob, > The beat note idea occurred to me, as well. I see the "disturbance in the > force" when using the internal clock (10811) of the 5370A, as well as when > using the 10811 from the 5335A as the reference. But, if this were the > case, I would think it would be a well known phenomenon. Assuming you have a > 5370A/B, do you see it on your end, or do you just always use a Cs as your > reference clock? I see a lot of discussion about comparing two devices, but > never any discussion about the reference clock for the equipment that > performs the measurement. > I suppose I could warm up my spare 34310-T and see what happens when using > that as the reference. > > Bob > > From: Bob Camp <[email protected]> > To: Bob Stewart <[email protected]>; Discussion of precise time and frequency > measurement <[email protected]> > Sent: Thursday, May 14, 2015 6:06 AM > Subject: Re: [time-nuts] New 5370A > > Hi > > One of the (many) nice thing(s) about TimeLab is that you can run multiple > plots on the same data. Often > when you see wiggles in one plot, looking at another plot can help you figure > out what is going on. > > The “best guess” when you see wiggles on the left side, is a spur or beat > note. > > Bob > > > >> On May 13, 2015, at 11:11 PM, Bob Stewart <[email protected]> wrote: >> >> I got a new 5370A, so of course I've been running a bunch of tests on it. >> In the image linked below, the start channel is my PRS-45A, the stop channel >> is my GPSDOe ("e" is for engine) and the ARM channel is fed by the PPS from >> my SSR-6Tru. As you can see in the notes, the test parameters are all the >> same, except for the clock source for the 5370A. As you might guess, my >> question is about the blue line, which is where the 5370A uses its internal >> 10811 as its clock reference. Is it normal for tests run like this to have >> the left side of the ADEV be such a "wiggle" on the internal reference? I >> had noticed the same thing with the 5335A I've been using up till now and >> had just assumed there was a problem with its 10811. The OCXO in my GSPDO >> is a surplus Trimble 34310-T. It's been running for several weeks, but is >> still in retrace. >> >> http://evoria.net/AE6RV/5370A/Test1.png >> >> And kudos to John for Timelab. It doesn't play well with Wine in Linux, but >> that's not terribly surprising, all things considered. >> >> Bob >> _______________________________________________ >> 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. > > > > _______________________________________________ > 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. _______________________________________________ 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.
