The SMT package was soldered directly to the PWB while I understand the DIP package is up in the air, that will affect the thermal time constant between the PWB and the chip quite a bit. I think I would glue the DIP on the PWB dead-bug style myself. That would get you close to the original configuration.
Didier > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Mark Sims > Sent: Sunday, July 26, 2009 5:37 PM > To: [email protected] > Subject: [time-nuts] Thunderbolt temperature measuring > > > From my poking and prodding, I think the temperature sensor > serves two purposes. First as an environmental alarm. > Second as compensation for temperature effects on the system > as a whole. As such, you want it near where it was. > Sticking it on the oscillator would mask a lot of the ambient > temp changes that it is making adjustments for. > > Another thing to consider is the difference in the thermal > mass / time constant of a DIP package and the SO-8 package. > The DIP will respond more slowly to temperature changes. It > is not known how that might affect the oscillator > disciplining algorithm. > > ---------------------------------------- > _______________________________________________ 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.
