[time-nuts] Storage of Rb & Cs standards?

Brooke Clarke brooke at pacific.net
Thu Aug 19 16:18:35 EDT 2004

Hi Poul:

That makes sense.  Just strting a web page for the FTS 4060 at:

Any info on the HP 4065 storage?


Brooke Clarke, N6GCE

Poul-Henning Kamp wrote:

>In message <4124F77D.8020006 at pacific.net>, Brooke Clarke writes:
>>The manual for the current Symmetricon 4065 Cs standard says to store it with the ion pump running.  The manual for the HP 4065 Rb standard says to connect a low current source to a couple of wires when it's stored.
>>Can someone say why you should keep the ion pump ging and what
>>happens if you don't?
>To keep the vacuum intact.  The ion pump creates a very deep vacuum
>very slowly.  Normally it can keep up with any leakage just fine,
>but if the tube is stored for long time it can take similarly long
>time for the ion pump to evacuate the tube.  HP has a procedure for
>thre 5061 where they apply a higher voltage to the ion pump to speed
>up the process.


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