[time-nuts] Some More questions
phk at phk.freebsd.dk
Thu Jan 19 09:07:47 EST 2006
In message <43CF928D.4030101 at erols.com>, 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
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
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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