Pete, Paul, You can always try increasing the Cs oven temperature. I'm told +10 C will double the beam current -- and half the life. But my my, hey hey sometimes it's better to burn out than fade away.
/tvb (i5s) > On Dec 6, 2014, at 5:25 PM, Pete Lancashire <p...@petelancashire.com> wrote: > > 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" <paulsw...@gmail.com> 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 < >> mag...@rubidium.dyndns.org >>> 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 -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ >>> mailman/listinfo/time-nuts >>> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.