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

Mark Spencer mspencer12345 at yahoo.ca
Tue Jan 18 18:48:56 UTC 2011

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:

1 Sec stability- <3E-11
1 month aging - +/1 1E-10

Neat, but only really of benefit to *really* space/weight/power critical

"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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