[time-nuts] HP 5061Cs reference question

[Tom Van Baak (lab)]

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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