[time-nuts] What is the best counter for a Time Nuts?

Brooke Clarke brooke at pacific.net
Wed Oct 8 21:43:07 UTC 2008


Hi Bruce:

The Ref Output on the front panel of the SR620 is derived (1/10,000) from the 
EXT IN on the rear panel.  So when you apply a 10 MHz signal to EXT IN you get 
a 1 kHz REF OUT.  Appendix B in the PSR10 Rubidium source manual describes how 
to use this along with the arming function to average 1,000 measurements per 
second resulting in 2E-12 per second on the display.  i.e. very close to the 
HP53132A.  So no external hardware is required and no PC to get this result.

Have Fun,

Brooke Clarke
http://www.prc68.com
http://www.precisionclock.com


Bruce Griffiths wrote:
.....
> 
> It is also possible to use a SR620 or a 5370 to take 1000 timestamps/sec.
> However may require using some external hardware (frequency divider).
> For maximum accuracy and precision the resultant data has to be logged 
> and processed off line using a PC or other computer.
> 




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