[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 

They could have included it in the autocal thought.


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