That was with an external 10 MHz source with both rear-panel reference and front-panel Ch B inputs fed from a passive 4:1 splitter, by the way. Feeding the EXT reference output directly to Ch B through a 6' cable results in an average reading much closer to exactly 10 MHz.
-- john, KE5FX > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of John Miles > Sent: Thursday, February 22, 2007 12:30 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Fine print on HP 5334B > > > What do people observe on their 5370A/Bs? After warmup, I tend to see a > bias of about +0.0005 Hz, or 5E-11, when observing its own 10 MHz source. > There is some occasional random waffling on the order of about > +/- 0.001 Hz > but for the most part it reads close to 10.000 000 000 5. > > I have never been able to calibrate the interpolators (specifically the > anticoincidence adjustment) in these counters, due to lack of a > vernier-adjustable pulse generator. When I was going through one > last week, > I just left the anticoincidence pot in the middle of its range, > and couldn't > see any ill effects from doing so. The manual is not that great at > describing exactly what this adjustment does. > > -- john, KE5FX > > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
