There is no qualitative difference between the physics of a 5062C and 5061A/B. They both use the (3,0) to (4,0) transition. For whatever reason, the C-field is set for a Zeeman separation of 40-50 kHz in the 5061 and 70 kHz in the 5062.
The effect of the different magnetic bias levels is slight at the (0,0) transition but still apparent, accounting for most of the +4.3 Hz offset in the 5062C and the +1.6 to +2.5 Hz offset in the 5061 models. It's deterministic in both cases, so I don't know of any reason why the 5062C couldn't be considered a primary standard. It's not a high-grade primary standard as those things go, but it passes the desert-island test. On the other hand, the front panel of the 5061A says it's a "standard," while the 5062C says it's a "reference." So the distinction obviously had some meaning inside HP, if nothing else. It's not clear what we can read into that, though, since the 5065A rubidium clock (which unquestionably is *not* a primary standard) is also labelled as a "standard." -- john, KE5FX > -----Original Message----- > From: [email protected] [mailto:[email protected]]on > Behalf Of [email protected] > Sent: Tuesday, February 23, 2010 1:37 PM > To: [email protected] > Subject: Re: [time-nuts] Fw: Rb Oscillator - rather fundamental question > > > 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 > _______________________________________________ > 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. > _______________________________________________ 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.
