[time-nuts] Storage of Rb & Cs standards?
brooke at pacific.net
Thu Aug 19 16:18:35 EDT 2004
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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