[time-nuts] COTS cesium standard physics package life

Ruslan Nabioullin rnabioullin at gmail.com
Thu Sep 29 13:56:21 EDT 2016

On 09/29/2016 01:50 PM, John Ackermann N8UR wrote:
> 2.  Tube vacuum and other physical aspects that may deteriorate over
> time, whether or not the tube is operating.  The routine ion pumping
> helps keep the vacuum up in storage, but is not as effective as the
> continuous pumping that occurs during operation.
> This is guesswork, but I suspect the warranty period was based on (1),
> which is why it is shorter on the high-performance tubes, which deplete
> cesium more rapidly.  There may also have been an assumption that not
> many customers were buying Cs standards and putting them in storage.

But I'm interested in a different case---having the unit be continuously 
in operation (so continuous pumping, not two or three times per the 
period), but having the cesium physics package be in rare, intermittent 


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