[time-nuts] What is the best counter for a Time Nuts?
brooke at pacific.net
Wed Oct 8 21:43:07 UTC 2008
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.
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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