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

Bruce Griffiths bruce.griffiths at xtra.co.nz
Wed Oct 8 23:06:43 UTC 2008





----- Forwarded Message ----
From: Brooke Clarke <brooke at pacific.net>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Thursday, 9 October, 2008 10:43:07 AM
Subject: Re: [time-nuts] What is the best counter for a Time Nuts?

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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