[time-nuts] Symmetricom Launches CSAC Product for Precise Timing and Synchronization

Brooke Clarke brooke at pacific.net
Tue Jan 18 19:32:21 UTC 2011


Hi Mark:

I got the idea that it's a Rubidium clock.

Have Fun,

Brooke Clarke
http://www.PRC68.com


Mark Spencer wrote:
> The long term aging spec is interesting to me, as a cesium physics package is a
> primary standard wouldn't there be an ultimate limit to the total long term
> aging ?  (I took a quick glance at the full data sheet and didn't see any
> reference to this.)
>
>
> ----- Original Message ----
> From: Julien Goodwin<time-nuts at studio442.com.au>
> To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
> Sent: Tue, January 18, 2011 8:04:20 AM
> Subject: Re: [time-nuts] Symmetricom Launches CSAC Product for Precise Timing
> and Synchronization
>
> On 19/01/11 02:35, Pierpaolo Bernardi wrote:
>    
>> Though this could be of interest...
>>
>> http://www.insidegnss.com/node/2446
>>      
> "The SA.45s reportedly provides ... short-term stability (Allan
> Deviation) of 2E-10 @ 1 sec, long-term aging of 3E-10/month"
>
> > From the data sheet of the bigger Rubidium micro-clocks:
>
> SA.33/35m:
> 1 Sec stability-<3E-11
> 1 month aging - +/1 1E-10
>
> Neat, but only really of benefit to *really* space/weight/power critical
> devices.
>
> "The cesium atoms are “excited,” or heated to a vapor state by a beam
> generated from a vertical-cavity surface emitting laser (VCSEL) that
> passes between upper and lower polymide heater/suspension strips. The
> VCSEL was designed by Sandia Labs, one of Symmetricom’s partners on the
> CSAC team."
>
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