My Efratom M-100 has been running for about 15 years 24/7. I have no idea if that is typical. It was purchased as NOS for $300. Rob NC0B
Sent from my iPad > On Mar 27, 2016, at 9:11 AM, "Bob Camp" <kb...@n1k.org> wrote: > > > > Hi > > The “typical life” numbers on the tubes in the various Cesium standards > are fairly accurate. Most units that are well cared for “die” when the tube > goes out and come back to life when it’s replaced. The tube life dominates > the MTBF in this case. > > Rb’s are a device that by it’s (possibly unfortunate) physics needs to run > hot. The vast majority in service are “miniature” in comparison to a 5071 or > a 5065. That drives the temperatures of all the parts up. MTBF on them > is very “temperature of use” dependent. They fail for a range of reasons > as the parts in them die of “hot old age”. > > Efratom had some pretty good data on MTBF vs temperature in the LPRO > data sheets. The internals of all the designs are similar enough that it > likely > applies over more than just one design. Temex has a similar data snapshot. > I have a sample of the Temex units in front of me as I type this. They died > as one would expect - from something other than the bulb. Capacitors, IC’s, > crystal drift, board corrosion, being crusted (physical damage), each pop up > in the sample. > > Bob > >> On Mar 27, 2016, at 7:53 AM, Attila Kinali <att...@kinali.ch> wrote: >> >> Moin, >> >> Maybe someone here can help me. >> I am looking for data on the reliability of atomic clocks. >> I.e. how often and, if possible, how they fail. >> >> Unfortunately, if I google for reliability then all that pops up >> are descriptions of the accuracy and stability of atomic clocks. >> If I go for MTBF I only get two papers from the 70s that tackle >> the problem in general, without giving any data. >> >> Does someone know where I could find current data about MTBF and >> failure modes of atomic clocks? Given the number of 5071's installed >> in labs, there must be at least some data on them.... >> >> >> Attila Kinali >> >> -- >> Reading can seriously damage your ignorance. >> -- unknown >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > -- > If this email is spam, report it to > https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg2NjU0NTcxNzpyb2JAbmMwYi5jb206ZGVsaXZlcmVk > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
