On Sun, Mar 19, 2017 at 8:03 PM, Tom Van Baak <t...@leapsecond.com> wrote:
> > Thanks for the raw data. It's very nice (2 hours 16 minutes = 8219 > points). Everything looks fine with the exception of 8 glitches. These are > sometimes obvious jumps in phase, which cause massive spikes in frequency. > Two plots attached. > First, thanks to Tom for taking a look at these files. > Almost every data point is within a few ns of each other. This is good. > The standard deviation is a fraction of 1 ns. But once in a while there is > a relatively massive phase jump. This is bad. Interestingly these 8 phase > jumps all appear to be about 25 ns or a multiple of 25 ns in magnitude. The > full list is (ns units): > > 24.575 > 24.724 > 24.831 > 25.047 > 25.087 > 25.549 > 25.589 > 49.623 > > 25 * N ns is not random. So I think this is not a Windows problem, not a > USB problem, not a TimeLab problem, not a TICC problem either. > Personally, I didn't think it was any of the the above either. The PicDiv trace showed no such glitches, so I was fairly confident that the TICC was working well. But just to verify that, I connected the LTE-Lite PPS to the 5370A and let it run for a few hours. The 5370A captures similar glitches. I have sent the file on to Tom. For entertainment value, I have attached the current Lady Heather screenshot for the LTE-Lite. It has little relationship to the .tim files I sent to Tom since I generated those a few weeks ago. FWIW, it shows an off by two error writing some text, for example: "PDTDT". This seems to happen if you go to some other screen (I think it was help in this case) then returning. Orin. [image: Inline image 3]
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