[time-nuts] another Ebay mixup, 5370

John Miles jmiles at pop.net
Sat Jun 9 22:09:06 EDT 2007

It only goes up to 20-25 ps here, measuring the Thunderbolt->5087A output
while running from the internal reference.  About the same as what I see
when measuring either the 8640B or 8662A.  Definitely some correlation going
on, but not as significant a difference.

That is probably the sort of thing that the (no doubt misadjusted)
interpolator trimmers are designed to minimize.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Dr Bruce Griffiths
> Sent: Saturday, June 09, 2007 6:59 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] another Ebay mixup, 5370
> John Miles wrote:
> > Pretty similar results here, taken from the 5370B's rear-panel
> output while
> > running on the internal 10811B (attached).  Indicated jitter
> with this setup
> > is about the same as it was on the ext ref via the 5087A (10-12 ps).
> >
> > I've seen this counter return self-test jitter results in the
> 15-25 ps range
> > before.  Not sure why it's in such a good mood today.
> >
> > At any rate, it doesn't appear that the wave shape is a
> problem... but of
> > course, you will usually get better jitter readings with a fast
> edge than
> > with a sine wave.
> >
> > -- john, KE5FX

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