[time-nuts] Some More questions

Poul-Henning Kamp 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.

More information about the time-nuts mailing list