[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

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.

More information about the time-nuts mailing list