Quartzdyne makes pressure and temperature sensors for the oil industry based on quartz xtals:
http://www.quartzdyne.com/quartz.html Daniel Em 13/03/2016 01:04, "jimlux" <[email protected]> escreveu: > On 3/12/16 7:35 AM, Bob Camp wrote: > >> Hi >> >> The conventional MCXO uses an AT cut crystal rather than an SC. It >> runs on the fundamental and the third overtone. You can build one >> with just about any normal fundamental crystal. There are also people >> doing OCXO’s sort of the same way. Back when the MCXO came out, it >> was about the only way to get a TCXO that had < 1x10^-8 sort of >> stability. Now you can get that with a cheap (as in not $5,000 each) >> commercial IC based TCXO. >> >> >> And heck, if you can tolerate the 1.5W warm up power, you can get ppb > sorts of accuracy in a OCXO at 250mW. (Vectron EX421) They're a few > hundred dollars. > > The Qtech MCXO is about 100 mW, and somewhat bigger than the EX421 (not > much bigger) > > The vectron MX-503 is in the 50 ppb range at 40 mW (I don't know how it > does the internal compensation.. maybe it uses some other kind of > temperature sensor) > > _______________________________________________ > 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.
