[time-nuts] Rubidium standard life

Corby Dawson cdelect at juno.com
Thu Nov 12 18:10:45 UTC 2009


Glenn,

The lamp is usually the limiting factor. 

The PRS10 advertises its lamp life to be 20 years.

HP bulbs last a bit longer.

Tracor bulbs fail with a different mechanism and last maybe 10 years.

Efratom bulbs last at least 10 to 15 years.

The rejuvenation you referred to is for lamps that have been off for
years in uncontrolled temperature environments.

These bulbs are not bad, the rubidium has just migrated to the wrong part
of the bulb.

With a little effort it can be coaxed back where it belongs.

A really bad bulb can not be rejuvenated as the rubidium has been
absorbed into the inner lining of the bulb envelop.

Sometimes these bad bulbs show a definite envelope darkening to the eye.

Hope this helps.

Corby Dawson
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