Monitoring the crystal temperature would probably be extremely boring. I would expect it to be absolutely stable, as far as the internal TB temperature monitor is capable of displaying it.
Monitoring the electronics temperature is useful because it relates to the ambient and allows you to plot the dependancy of frequency to ambient, and indirectly verify that the air conditioning is working. Putting the TB in an isolated box may be counterproductive, because the ~10W of average dissipation has to go somewhere, otherwise the TB will cook itself crisp. On the other hand, I think it would be very well advised to place the unit in a quiet area with minimal temperature changes, like you would do to keep a good bottle of wine. A while back I plotted the current consumption of an HP 10811 as a function of ambient temperature in my not-very-well regulated ham shack (http://www.ko4bb.com/Test_Equipment/HP10811-Current.png). It was as predicted, considering the ~80 degree operating temperature of the oven. Keeping the unit at constant ambient reduces the need for the oven to draw more or less current. No matter how well the oven is decoupled from the crystal, nothing is ever perfect, so minimizing the ambient variations has got to be a good thing. Didier KO4BB > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Reynaert > Sent: Friday, July 11, 2008 1:22 PM > To: time-nuts@febo.com > Subject: [time-nuts] Thunderbolt - temperature > > Hello, > > I have a question regarding the temperature reading in the > Thunderbolt Monitor program of the Trimble Thunderbolt GPSDO. > Is this the temperature of the board or the temperature of > the crystal? > > Related to this: does it help to put the Thunderbolt in an > isolated box or is this an overkill? > > Thanks. > > Patrick > Belgium. > _______________________________________________ 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.
