[time-nuts] Frequency Counter Errors
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.
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
> 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?
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