[time-nuts] HP 5061Cs reference question
Tom Van Baak (lab)
tvb at leapsecond.com
Sat Dec 6 20:49:27 EST 2014
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.
> 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.
>> On Sat, Dec 6, 2014 at 1:56 PM, Magnus Danielson <
>> magnus at rubidium.dyndns.org
>>>> On 12/06/2014 06:04 PM, Tom Van Baak wrote:
>>>> 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:
>>> 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:
>>>> A nice description from hp how a cesium beam standard works:
>>> Do check the FTS-4065C manual as I just uploaded. Good complementary
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/
>>> and follow the instructions there.
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> and follow the instructions there.
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the time-nuts