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
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