[time-nuts] Frequency Counter Errors

jmfranke jmfranke at cox.net
Thu Mar 22 00:11:39 UTC 2012


First, try counting the Rd reference frequency output. If one reads right 
you are halfway to solving the problem.

John  WA4WDL

--------------------------------------------------
From: "Jerry Mulchin" <jmulchin at cox.net>
Sent: Wednesday, March 21, 2012 8:05 PM
To: <time-nuts at febo.com>
Subject: [time-nuts] Frequency Counter Errors

> I have a question for the collective group.
>
> I have a HP 5372A and a HP 5328A frequency counters. Both counters use the 
> same
> PRS-10 Rubidium frequency standard driving a 6 channel reference 
> distribution amplifier
> to each counters reference input port. The problem is this;
>
> When I measure the same frequency on both counters, (done one at a time) 
> the frequency
> is generally off by about 300 Hz or so between the counters. Now I would 
> expect an error
> of +/- 1 digit, but 300Hz seems a bit strange to me. I can not find the 
> problem and the
> difference exists even if I use the internal timebases of each counter, 
> give or take the timebase errors.
> The frequency is always at least >200 to 300Hz off between the two 
> counters and I don't know
> which one to believe. You know the "man with 2 clocks" problem.
>
> Anyone have any idea what may be causing this?
>
> Thanks
> Jerry
>
>
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