In message <[email protected]>, Chuck Harris writes: >> I ran the device today for about half an hour, and used an infrared >> sensing thermometer to measure the external case temperature.
Be very careful about trusting this: you need to do some tricky calibrations to get anywhere near precise when you measure metal surfaces. The easy way, is to put a piece of duc[kt]tape on the metal surface and make sure your thermometer can see only that surface. Unfortunately, the tape will also act as insulation, so the result you get is not precise even then. >> It got up to 48 C externally in the physics package area. That's quite normal. Those small Rb's keep the internal temperature constant using heaters, which can raise the temperature and by being able to dump excess heat through their heat-sink to lower the temperature. You shouldn't run your Rb too hot, as this decreases the electronics lifetime and reduces the wiggle-room of the thermal management inside the device. On the other hand, cooling it too much will only increase the power drain for the heaters and increase the thermal gradients inside the unit, likely degrading thermal stability. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ 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.
