[time-nuts] New 5370A

[Bob Camp]

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 <bob at evoria.net> 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 <kb8tq at n1k.org>
> To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com> 
> 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 <bob at evoria.net> 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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> 
> 
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