Hi Well …. folks have made AT based OCXO’s that heat up in “seconds” ( as in under a minute ). Back in the 1980’s they stabilized to < 1x10^-7 at least as fast as the then typical SC based OCXO’s did …. ( < 6 minutes ). Collins bought quite a few of them over the years.
Bob > On Jun 10, 2022, at 1:25 PM, Dr. David Kirkby via time-nuts > <[email protected]> wrote: > > On Fri, 10 Jun 2022 at 17:39, Lux, Jim via time-nuts < > [email protected]> wrote: > >> >> On the subject of rapid warm up. I suppose if you had a need, one could >> dump as much power as you need into the heater. Turn on oscillator, >> lights in room dim for a few moments. >> > > Is that not likely to damage a crystal? Different parts of the crystal and > likely to be at significantly different temperatures at the same time, > putting a lot of stress on the crystal due to a thermal gradient. It's > probably a bit academic, as nobody is going to make an oven that heats up > in fractions of a second, but if one did, I suspect it might not do the > crystal a lot of good. This is only an educated guess - I don't have > anything to back it up. > > At the other extreme, would there be any advantage in actually heating the > crystal very slowly, over the course of an hour/day/week, so the > temperature gradient across the crystal is very small? Of course, if an > oven took ages to reach the correct temperature, it would be inconvenient > for most applications, but for some applications, the advantages might > outweigh the disadvantages. Of course, if one does this, I suspect one > would have to cool the crystal slowly too to prevent a significant thermal > gradient across the crystal. > > I know it's a bit different, but I have a 600 mm f4 Nikon camera lens. I > was told that Nikon cools the front element over a period of 6 months to > reduce stresses in the glass. > > Dave > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe send an email to [email protected] _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe send an email to [email protected]
