Rick Karlquist wrote:
[email protected] wrote:
The HP 5062C is not a "Primary Standard", and that is why it is called a
"Reference" because it uses a different transition of Cesium 133 with the
frequency of 9192.631,774,3 MHz which does not meet the definition of a
second
and resulted in a relative short product life even though modified to run
with a FTS tube and "Standard Frequency" makes it a grate Frequency
Standard.
Bert Kehren
I never knew that. I stand corrected on the 5062C.
Ehm, no. This is just 4,3 Hz higher than the 0 C-field transition. It's
not a different transition, it is the C-field shifted (0, 0) transition.
I know of no Caesium clock that uses 0 C-field applied. The C-field
helps to spread out the 7 Rabi constellations such that the Ramsey
features can be investigated for the (0,0) transition can be
investigated correctly. This is a key to properly test the frequency.
The C-field shift is compensated for as it is fairly accuratly
predicted. The C-field is servoed by looking at the neighboring
tranistions Rabi constellations which depends stronger on the C-field.
This is what a "digital" Caesium does and is what is needed to become
primary standard as it removes aging in the C-field. The systematic
error that remains can be handled at design and trimmed in product
development.
The 5062C is not different in this respect.
So Rick, I don't find that you stand corrected.
Cheers,
Magnus
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
