On Wed, 25 Feb 2015 10:16:58 +0100 Attila Kinali <[email protected]> wrote:
> Actually, you should put the temp sensor close to the heater, not the crystal. > The delay between the actuator (heater) and the feedback (temperature sensor) > defines the dead time. The presence of a crystal somewhere in the system is > of no importance to the oven controller, it's just additional thermal weight. Bob Camp just reminded me of Rick Karlquist's papers on this topic: "A low Profile High-Performance Crystal Oscillator for Timekeeping Applications", by Karlquist, Cutler, Ingman, Johnson, Parisek, 1997 http://www.karlquist.com/osc.pdf "The Theory of Zero-Gradient Crystal Ovens", by Karlquist, Cutler, Ingman, Johnson, Parisek, 1997 http://www.karlquist.com/oven.pdf More can be found on his homepage: http://www.karlquist.com/ A bit more theoretic, but maybe also of interest: "OCXO Design Using Composite Heating of the Crystal Resonator", by Abramson, 1994 http://dx.doi.org/10.1109/58.279145 Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ 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.
