Paul and I have tubes that most would consider dead. Mine is not far behind. I fire it up about 3 to 4 times a year if anything to keep it pumped down. I can still get the correct peak with the internal meter but it is getting harder each time. On Dec 6, 2014 11:16 AM, "paul swed" <[email protected]> wrote:
> All good answers with a good tube and enough current to read on the meter. > But I am working at the very limit of the Cs fumes. There is current, about > .5 to 1 tick mark on the meter of a 5061 using a 5060 tube. > Thats the challenge on a very eol tube. > Regards > Paul. > > On Sat, Dec 6, 2014 at 1:56 PM, Magnus Danielson < > [email protected] > > wrote: > > > Tom, > > > > On 12/06/2014 06:04 PM, Tom Van Baak wrote: > > > >> Paul, > >> > >> There are 7 peaks total, about 40 kHz apart (on my 5061A). If you're > >> talking about just the central peak, there are two smaller peaks on > either > >> side, about 1 kHz apart. The exact value depends on internal magnetic > >> field, which is specific to each beam tube design. > >> > >> For some measurements of all the peaks, have a look at: > >> http://leapsecond.com/pages/cspeak/ > >> > > > > These are the 7 Zeeman pedestals, and on top of them you have the Ramsay > > fringes. You can indeed lock onto the wrong Ramsey-fringe, but they too > > have amplitude differences. For a normal tube, they are quite > significant, > > but if you look at the Ramsay fringes on the NIST-F1, they are much > denser > > and looses amplitude much slower, so you need to pay more details of > which > > fringe you use. The density of the Ramsay fringes is due to the > observation > > time, which has been one of the driving forces to develop hydrogen masers > > and cesium fountains, but for a simple cesium tube, it's a few dm of > > distance and the average speed of the cesium steam. > > > > You can play with the C-field in addition to playing with peaks: > >> http://leapsecond.com/images/cfield.gif (578 x 4610 pixels) > >> > > > > Which is a good illustration. It would be good. > > > > For more details search the archives for the word Zeeman. For example: > >> https://www.febo.com/pipermail/time-nuts/2005-April/018171.html > >> > >> A nice description from hp how a cesium beam standard works: > >> http://leapsecond.com/museum/hp5062c/theory.htm > >> > > > > Do check the FTS-4065C manual as I just uploaded. Good complementary > > information. > > > > 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. > > > _______________________________________________ > 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.
