[time-nuts] Frequency Counter Errors

Azelio Boriani azelio.boriani at screen.it
Thu Mar 22 00:25:17 UTC 2012


Yes, first try the Rb with their internal timebases. Got the PRS10? Nice Rb
reference: I had one (brand new) last month for only one week...

On Thu, Mar 22, 2012 at 1:11 AM, jmfranke <jmfranke at cox.net> wrote:

> 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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>
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