John Miles wrote: > 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 > > > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> Behalf Of Hal Murray >> Sent: Thursday, February 22, 2007 12:10 PM >> To: [email protected] >> Subject: [time-nuts] Fine print on HP 5334B >> >> >> (Interesting timing given the SR620 discussion.) >> >> I'm (finally) getting my GPIB gizmo working. >> >> I have a HP 5334B running off its (good) internal osc looking at >> the output >> of a Z3801A. Assuming the Z3801A is stable, this is a backwards way of >> looking at the internal osc. (There is a shared in/out connector for the >> internal clock, so I can't see the internal osc if I feed it an ext >> reference.) >> >> I left it running for a night with the mostly default setup and 100 cycle >> averaging. I think the default gate time is 0.3 seconds. Answers ranged >> from: >> F +9.999999330E+06 >> F +9.999999333E+06 >> >> > > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > John
Connecting the frequency output to the Frequency/period input (set to 50 ohm) with a 1m double screened RG58 cable displays a frequency of 10.000000004 with rms fluctuations of about 2 in the last digit. This occurs right at start before any warmup with an HP5370A that doesn't have an HP10811 or equivalent internal oscillator. oscillator. Bruce _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
