Well, you could just toss a Thunderbolt into the box and use Lady Heather to
do the temp control. Using just a fan and cardboard box and maybe some thermal
mass, you can stabilize the temperature to within a few millidegrees
(microdegrees long term average) as long as the desired temp is between ambient
and say 50-60C. To go below ambient you would need a peltier. You could move
the temp sensor off board to keep the tbolt self-heating out of the environment.
I have an ESI SR104 standard resistor and Tbolt mounted in a box. The control
temp is set at one of the two points where the SR104 is at precisely 10,000
ohms... just for good measure I also have a precision 10 volt reference and a
0.01uF cap in there also... four standards in one box all basking in the warm
glow of a Tbolt.
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