Well, perhaps it is time to think outside of the sand box. We are trying to remove heat, not cool it to low temperatures. Who else worries about heat from electronics? Gamers, who buy water-cooled rigs for their over-cooked (clocked) computers. No magnetic fields nearby, with enough tubing. Look around in a DIY computer store. Now all you've got to do is control the temperature where the fan and radiator are, and extreme insulate the tubing.
Back into the box, microprocessors have been used to calculate temperature compensation almost since they were introduced. If you are measuring frequency with a counter, it does no harm to add or drop a cycle to adjust the frequency. You'll need a high-stability temperature probe, such as platinum wire from Rosemount (now part of Emerson), and equally stable conversion electronics. The accuracy doesn't matter as long as the sensor doesn't change with anything but sensed temperature. The micro is simply a matter of programming (SMOP). Good luck finding a converted temperature reading that is stable to 10E-13. But, hey, it's the magic season when the days start to grow longer. Wish all problems were this easy. :-^ Bill Hawkins _______________________________________________ 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.
