Hi Tom and Magnus: Thanks for your reply and informations. I was wrong about
all SA.3x things, I thought SA.3x was a traditional Rb87 optically pumped
structure rather than CPT concept clock, because I noticed that SA series
consums more power(5W at locked), not less power consumption(less 100mW) on the
paper of CSAC. Another mistake I made was that I thought only Cs could be used
in CSAC or MAC. Thanks for pointing that out, now I'm clear ith that. Regards.
Hui Zhang On 2017-10-13 00:06 , Tom Van Baak Wrote: Hi Hui Zhang, > in the
paper CSAC was described that it is based on CPT technology > My question is
the SA.3x(or SA.2x) also used this method? Yes. Here's another good read; and
it also includes photos of the inside of your SA.33:
http://www-users.york.ac.uk/~jke1/Atomic_Clocks/Papers/Commercial%20CPT.pdf >
In my impression the SA.3x series clock is called Rubidium clock, > and the
SA.45 is a real Cesium CSAC? Your use of the phrase "real cesium" may be the
source of your confus
ion. The SA.3x uses rubidium and the SA.4x uses cesium. They are all real
atoms. These modern MAC / CSAC atomic standards compete with high-end DOCXO
quartz oscillators with respect to factors like temperature, stability, and
drift. They do not compete with traditional laboratory rubidium or cesium
standards. You may be thinking that because some CPT clocks use cesium instead
of rubidium that they are special or more accurate, but this is not the case.
None of these compact low-power laser / VCSEL / CPT -based frequency standards
are primary standards. /tvb ----- Original Message ----- From: "Jar Sun via
time-nuts" <time-nuts@febo.com> To: <time-nuts@febo.com> Sent: Saturday,
October 07, 2017 8:27 PM Subject: [time-nuts] Question about SA.33 Rb clock
Dear group: I have got a SA.33 Rb module from a second hand GPS clock, at first
it works well, but soon after it was damaged that beacuse I was trying to
install a heat sink on it, unfortunately I used screws which its size too long,
so maybe the screws drilled into inside Rb lamp or inside circuit something? I
don't know. I am not expecting this Rb can be receoveyed, I am just hope there
is no some martirial hamfully leaked out. TVB gave me some information about
this Rb module and a papers on this website:
http://tycho.usno.navy.mil/ptti/2002papers/paper52.pdf I have read the paper
for two times, but I am confused now, the paper described a principle of CSAC
clock in 2002, in the papger CSAC was described that it is based on CPT
technology, and the CPT is based on a VCSEL and a very small Cesium Cell and
other implement necessarily. My question is the SA.3x(or SA.2x) also used this
method? In my impression the SA.3x series clock is called Rubidium clock, and
the SA.45 is a real Cesium CSAC? So if SA.3x or SA.2x used the technique which
mentioned in paper52, can we say there is some Cesium material in SA.3x? I am
totally confused, do anyone can give me some advice? Any information will be
appreciated, Thanks a
lot. Regards. Hui Zhang _______________________________________________
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