[time-nuts] HP 5061Cs reference question

[paul swed]

Tom
Thats exactly what I did in building a new oven controller. Figured I would
bake some leftover Cs grease off the bottom of the oven. Like you say
nothing to loose.
I took quite a bit of time in figuring out the levels and it took maybe 60
days. I will guess I am 10 C hotter. At the time I was far more accurate
and would need to pull out notes to look at the set temp....
But in magnifying the current meter I could see peaks and dips. Literally
through a very sensitive meter with a magnifying glass.
Like Pete I run it 3-4 times a year and am amazed when the 2nd harmonic
shows up and control takes over etc. I have tinkered with the c field.
Maybe I need to get more aggressive.

Regards
Paul
WB8TSL

On Sat, Dec 6, 2014 at 8:49 PM, Tom Van Baak (lab) <tvb at leapsecond.com>
wrote:

> 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 <pete at 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" <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.
> >> Regards
> >> Paul.
> >>
> >> 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
> >> 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
> >>>
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