[time-nuts] A counter for phase measures

Magnus Danielson magnus at rubidium.dyndns.org
Sat Nov 3 13:20:03 EDT 2012


Hi Tom,

On 11/03/2012 05:58 PM, Tom Knox wrote:
>
> Hi Magnus;
> I hope this is not to far off thread. Has anyone in the group done
> real world measurements of single shot res, and jitter on the new
> Agilent and Tektronix/Pendulum counters compared to the SR620 and
> Agilent 53132A. I would imagine that counter designs would be an
> area that really benefits from ongoing advances in digital technology.
> I have also found that it is much easier to claim specs then meet specs.

I haven't tested the new 53230 counter, and not the CNT-91/PM-6691 
counter either, but much of the others.

It should not be too hard to test this. I have made some tests with the 
aggregate of single-shot and trigger noise on a sine signal, i.e. 5 MHz 
out of a BVA. It gave the expected separation as a linear slope on the 
ADEV. On the other hand just tossing a sine into counters isn't 
necessary the most fair comparison, so in that sense it just gave a 
rough image.

This thread have again had me consider reviving the testing aspect, and 
I decided to get a 53132A counter finally, now that prices have gone down.

Cheers,
Magnus




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