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
operation.
-Ruslan
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