Hi You can run a controlled experiment where you simply change the pressure. Crystals are indeed pressure sensitive. It’s one of the reasons welded packages became more popular for OCXO’s ( welded crystal package inside a welded OCXO package means less pressure change onto the crystal package).
The source of the problem is flexing of the crystal package as pressure changes. That translates (even with an SC) into a frequency change. Bob > On Aug 3, 2019, at 12:56 PM, Richard (Rick) Karlquist <[email protected]> > wrote: > > How do we know the change is not due to humidity that happens to track > pressure? > > Rick > > On 8/3/2019 7:22 AM, ew via time-nuts wrote: >> Are wee missing something. Reading Bill Slade post and old NASA attachments >> the attached plot to me was an eye opener. Our work has always been focused >> on Rb pressure compensation. Are we overlooking something. Has any one done >> some work on this subject >> Thanks Bert Kehren >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
