Hi Rick:
I've used two types.
1. Most of the replies have been for controlled air temperature devices. These are by far the most common but also they
take a long time to change temperature.
2. Hot/Cold plates are much faster since the DUT is in close contact with the plate. We used these with a PID
controller and liquid Nitrogen gas. Just toss a towel over the DUT and you have very fast cycle times.
I built a DIY version for heat only using a couple of flexible heater strips glued to aluminum blocks, a PID controller
and a 10k thermistor embedded in one of the blocks. The Steinhart-Hart thermistor equation is of the third order with
respect to R but it is linear with respect to the coefficients making it easy to fit.
http://www.prc68.com/I/Sensors.shtml#Temperature
The unit is hiding from me, maybe it's photo shy.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.
-------- Original Message --------
As we all know, step #1 in making a clock is NOT
to build a thermometer :-)
I thought I would check the brain trust here to see
if anyone has seen a hobbyist grade temperature
testing chamber or kit or homebrew design. I
have some crystals, oscillators, and other
electronics I would like to characterize over
temperature. I know this reflector has discussed
homebrew stabilization ovens; however, they
have tended to have very long time constants
(which makes sense for that application). I
need to be able to change temperature in a
reasonable amount of time, and I don't need
extreme stability. Looking for any ideas,
maybe in the "maker" spirit. I think the
size I need would be perhaps 1/2 the size
of a shoebox.
BTW, in case someone has a chamber to sell,
let me know...
Rick Karlquist N6RK
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