Hi On Aug 12, 2013, at 3:21 PM, Yuri Ostry <[email protected]> wrote:
> Hello, > > Tuesday, July 30, 2013, 3:03:57, Bob Camp wrote: > >>> 3) what is the typical life of such a unit? > > B> If it's run without a heat sink, about two years. > > B> If it's power off on the shelf, many decades. > > There was another "aging factor" mentioned in some documents that > circulate around the net. Helium can diffuse from atmosphere through > glass walls ans change buffer gas composition inside the cells. >From what I have seen of "stored" cells - it's not a major issue. > > Run well cooled, >> 10 years for 90% of the units > > As I can see, my FRS-C still works well after approx 10 yrs on a cell > site working 24/7 and 5 yrs sitting on the shelf. But lamp voltage > that was recorded 5 yrs ago differs from the one that I measured > when I put it back to work. It is lowered little bit. The key question is - was it powered up in the cell site or simply sitting powered down? A *lot* of the cell site Rb's were in "emergency backup" applications (cell sites on trucks …). They sat around for 10 years, but didn't run for very long at all. Bob > > 73! > Yuri > UA3ATQ/KI7XJ > -- > Best regards, > Yuri mailto:[email protected] > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
