[time-nuts] 5370 processor boards available

Magnus Danielson magnus at rubidium.dyndns.org
Sat Mar 1 05:32:50 EST 2014

On 28/02/14 18:42, Tom Van Baak wrote:
>> I think one of the best chances would be to improve the phase
>> noise of the 200MHz signal.
>> But don't miss the fact that being able to make a LOT more measurements
>> in the same time also improves noise statistically.
> I agree with this. And it makes me wonder if someone on the list is now eyeing the SR 620 as the next classic instrument in need of a time nuts upgrade?
> It would be very cool if in the end both the hp5370 and the SR620 can be turned into true timestamping counters, a la the Pendulum CNT-9x and the Agilent 53230.

Just having ethernet and USB on them would help a lot.

The key point is that you need to hide the dead-time between the stop 
trigger and the arm trigger. You also need continuous time to be 
assuered, which typically means a runnning time counter. None of them is 
made to be a zero dead-time counter, where as HP-5371/5372/5373 and 
CNT-9x is. I think one has to think a little about how the counter HW is 
being extended to achieve the true ZDT properties.

The typical way for getting these counters hide their dead-time have 
been a higher rate trigger signal than arm signal (typcially x2). The 
other way is to use a pair of counters and having them being armed on 
every other measure.


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