[time-nuts] another Ebay mixup, 5370
Tom Van Baak
tvb at LeapSecond.com
Sun Jun 10 04:32:53 EDT 2007
> In the case of the 5370, page 3-12 of the manual is where it came from ("15.
> Press STD DEV and +/- TI switch. Display should read less than 100 ps (this
> reading is the instrument's jitter).")
I'm wondering if it would be more informative to make three
runs: one with A and B uncorrelated to ref; one with A=ref
and one with B=ref.
> At some point between my original 2316 edition and the 2904 edition scanned
> by David Kirkby, they apparently changed this step to call for pressing the
> +TI switch, unless the +/- symbol failed to scan properly. I get about
> 10-15 ps more jitter in +TI ONLY mode for whatever reason.
Agreed, that's odd. Bruce, any ideas on this one?
> The last time I studied the manual, I remember being convinced that the 5370
> would be relatively immune to clock-correlation effects if the interpolators
> were set up properly.
Right, but that's a big "if", especially if the unit is surplus. So it's
best to assume the interpolators aren't perfectly tuned which is
why keeping ref away from the A or B inputs is important.
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