[time-nuts] Fine print on HP 5334B

jshank j-shank at comcast.net
Fri Feb 23 09:20:51 EST 2007


I check my 5370b by using the 10 MHz output and feeding it to the counter. 
What I see is a fluctuation in the displayed reading of between 9.999 999 
998 73 to 9.999 999 997 25.  The instrument is set for 1 s gate. Sometimes 
one reading will remain for a couple of arming but usually the reading will 
change between six different readings with the high and low as above.

I am assuming there is a problem with this instrument and am asking for 
suggestions on what can be done to correct this problem.

Ps. this instrument has the 10811-06111 oscillator.  I have tried using the 
10 MHz output from the 5370 as an external reference to a 53131A while 
measuring the frequency of the 5370 10 MHz output.  After both instruments 
warm up the frequency of the 5370 output is displayed on the 53131A with a 1 
s gate time as 10.000 000 000  and if I increase the gate time to 10s the 
reading is 10.000 000 000 0 with the reading remaining rock solid.



----- Original Message ----- 
From: "John Miles" <jmiles at pop.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Thursday, February 22, 2007 3:29 PM
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
>> -----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
>> 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
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