FWIW... I visited an MoD microwave lab many years ago, and they used to run all their temperature sensitive stuff on a huge steel table about 3 inches thick, apparently to minimise the effects of ambient temperature change.
Rob K -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Poul-Henning Kamp Sent: 19 January 2006 14:08 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Some More questions In message <[EMAIL PROTECTED]>, Chuck Harris writes: >It would be interesting to see how such an oven performs compared to >the traditional double oven. According to a guy at the danish metrology lab, the optimal strategy is moving as little heat as you can get away with. They keep most of their stuff in a basement room where the air condition is set "hysterically" to 21 C. Temperature sensitive things then get a layer of insulation, for instance their resistance standards are mounted inside a huge aluminium block (roughly 50x50x25 cm) which acts as a buffer for any fluctuations the aircondition / open doors etc may cause. Their suggestion for a cheap environmental chamber is an old fridge where you keep the door closed. After some weeks it will have reached a stable temperature relative to the room. If your room temperature is not stable, run temperature controlled water through the loop of the fridge. -- 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] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
