Poul-Henning Kamp wrote: > In message <[EMAIL PROTECTED]>, Chuck Harris writes:
>> But that brings us back full circle: How do you do an exceptional >> job of controlling the temperature of a crystal that was designed >> to operate at 25C? > > You put it inside a solid block of copper or aluminium. > > You put that block inside a small enclosure where you try to hold > the temperature constantly at 25C. > That is obvious, and is what is done with conventional double ovens, and it is certainly what would be done with a double oven that has a Peltier device incorporated to allow the crystal to run at 25C. >> These >> instruments already have conventional double ovens around their >> sensitive bits. > > Far from always in the metrology business. You can't put your > kilogram artifact in a double oven for instance. True, but surely you don't think he was talking about kilogram artifacts? Last I heard, their weight was invariant with temp. As I recall, he was talking about electronic standards for time, frequency, and voltage. -Chuck _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
