[time-nuts] Fine print on HP 5334B
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Thu Feb 22 16:19:00 EST 2007
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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
>> Behalf Of Hal Murray
>> Sent: Thursday, February 22, 2007 12:10 PM
>> To: time-nuts at febo.com
>> 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
>> 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
>> F +9.999999330E+06
>> F +9.999999333E+06
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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.
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