[time-nuts] FE-5680A Rb Questions

Chuck Harris cfharris at erols.com
Fri Dec 16 08:29:47 EST 2011


It has been pretty well shown that the lamp life is
effectively infinite.  The only thing that happens to
shorten an effective useful "campaign" of the lamp is
when the Rb plates out on the lamp envelope, and
renders the glass opaque.  That problem, however, is
easily remedied, by heating the glass until the Rb
evaporates, and then allowing it to redistribute to
a more desirable position out of the optical path.

Disassembly, and a heat gun are all that is necessary.

-Chuck Harris

Azelio Boriani wrote:
> I think every Rb has a finite lamp life...
>
> On Fri, Dec 16, 2011 at 11:41 AM, Neville Michie<namichie at gmail.com>  wrote:
>
>>
>> Does the FE-5680A have a similar Rb cell to the LPRO-101?
>> If so do they have finite lamp life, (can you find the one you buy has
>> little life left?)
>> Or by not reporting the status of the lamp no-one worries about it?
>> cheers,
>> Neville Michie
>>
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