[time-nuts] HP53132A vs SR625
Magnus Danielson
magnus at rubidium.dyndns.org
Sun Mar 17 17:35:11 EDT 2013
On 03/17/2013 08:05 PM, SAIDJACK at aol.com wrote:
> Ed,
>
> the calculation is the same, however the numbers are 100ps for 53132A
> versus 350ps, and I have not seen an average systemic offset being displayed on
> any of the 3x 53132A units I use, and I see one on the SR-620. That's why
> I sent it into SRS for calibration, paid the $$$ and got it back with the
> same exact offset and a statement that it is operating within specifications
> so no adjustment is necessary.
>
> HP manages to show zero error on average, with the digits bouncing back and
> forth. The SRS unit manages to show a hard frequency offset. If I remember
> correctly the SR-620 even shows this offset with it's own reference
> connected to the inputs, the HP does not.
You can calibrate it out. SRS techs just being lazy, but it is not a bad
design.
They could have included it in the autocal thought.
Cheers,
Magnus
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