[time-nuts] HP 5061Cs reference question
pete at petelancashire.com
Sat Dec 6 20:25:19 EST 2014
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" <paulswedb at 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.
> On Sat, Dec 6, 2014 at 1:56 PM, Magnus Danielson <
> magnus at 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
> >> 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
> > but if you look at the Ramsay fringes on the NIST-F1, they are much
> > and looses amplitude much slower, so you need to pay more details of
> > fringe you use. The density of the Ramsay fringes is due to the
> > 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
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