Hi Mark:
That press release says something like "Cesium like performance".
But the diagram of the unit looks like a Rb standard.
That's to say they are shining light through a heated cell.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Mark Spencer wrote:
Strangely, the article from the original email in this thread
http://www.insidegnss.com/node/2446#Baseband_Technologies_Inc_
mentions the useage of cesium atoms in a resonance cell. The data sheet does
not mention cesium (at least from what I can see.)
----- Original Message ----
From: Brooke Clarke<bro...@pacific.net>
To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
Sent: Tue, January 18, 2011 11:32:21 AM
Subject: Re: [time-nuts] Symmetricom Launches CSAC Product for Precise Timing
and Synchronization
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-n...@studio442.com.au>
To: Discussion of precise time and frequency measurement<time-nuts@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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