[time-nuts] Hobbyist grade or homebrew temperature testing chamber?
Brooke Clarke
brooke at pacific.net
Tue Sep 6 22:42:42 UTC 2016
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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