[time-nuts] Symmetricon CS question

John Miles jmiles at pop.net
Fri Jun 24 05:53:48 UTC 2011

Current-generation CSACs work like rubidium standards, and perform similarly.  The optical excitation comes from a laser diode rather than a conventional Rb vapor lamp.  They can't be considered primary standards.

Compare the ADEV graphs of some of the 'classical' Cs standards with what you can see in the Symmetricom CSAC literature, and you'll see that they are really very different beasts.  

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-
> bounces at febo.com] On Behalf Of Perry Sandeen
> Sent: Thursday, June 23, 2011 10:40 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] Symmetricon CS question
> List,
> I’m still confused about the new Symmetricon CS unit.  Is it truly a cesium
> primary standard or is it a secondary standard that happens to use cesium?
> IF it is truly a primary standard, is saving up the $1500 for one a better deal
> IN THE LONG RUN than getting a used HP or other brand C.S. unit?   I’d want
> to use it and not have to fiddle with it to keep it running.
> Again, opinions welcomed
> Regards,
> Perrier
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