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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > 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 > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
