Hi Just to be clear, the current data sheet has the temperature range back to -10 to +70C. They most certainly had a major headache on their hands for several years straightening things out. I have not seen any complaints about the “new” (post rework) version of the part.
Bob > On Jan 25, 2018, at 3:31 PM, jimlux <jim...@earthlink.net> wrote: > > On 1/25/18 9:39 AM, gandalfg8--- via time-nuts wrote: >> At the time of writing a copy is available here.... >> www.obsip.org/documents/Gardner_IEEE_Oceans_2016.pdf > > > "While results from an early batch of CSACs have been largely positive, later > units have not performed as well. The CSAC specifications have changed, > reflecting a decrease in reliability and accuracy of more recent units." > > no kidding - there's a well known issue when MicroSemi took over building > CSACs from Symmetricom, these things (like many precision timing widgets) > have a "recipe" and it's easy to "lose the recipe" or find that there's > unexpected and unknown components to the recipe. > > Take a look at data sheet revs for the CSAC.. full temp range, then all of a > sudden around rev G or H, temperature range is quoted at 0-35C operating, > *0-40C non-op*. I asked the sales rep if they ship them with icepacks in > styrofoam like mail order cheese in the summer - that UPS truck gets way over > 40C inside. > > As always, this was discussed on the list and is in the archives. > > That being said, I have no complaints about Microsemi being forthcoming about > the issue and helping us to understand the nature of the problem. And they > claim to have fixed the problem. > > Hopefully, this summer, I'll have some data from a "narrow temp range" CSAC > against GPS 1pps in an environment where there's no gravitational effects, > and fairly small temperature fluctuations. > > _______________________________________________ > 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.