[volt-nuts] DIY Air bath

Andreas Jahn Andreas_-_Jahn at t-online.de
Fri Jan 13 20:51:17 UTC 2012


What about this?

http://www.eevblog.com/2010/07/25/eevblog-101-hacking-your-own-peltier-lab-thermal-chamber/

With best regards Andreas

----- Original Message ----- 
From: "Will" <willvolts at gmail.com>
To: <volt-nuts at febo.com>
Sent: Friday, January 13, 2012 2:53 PM
Subject: [volt-nuts] DIY Air bath


> Varying room temperature is a remarkable source of error when making
> measurements in home environment. It would be nice to have a simple
> air bath for the items under test. And even better if it was big
> enough for the multimeter too. There are commercial units available
> but very expensive.
>
> A DIY solution seems to be possible: a simple PI(D) controller built
> around an NTC resistor, op-amp, pass-transistor and heater plus a fan
> to keep the air moving inside the box. That approach allows
> temperature higher than room temperature only but in most cases
> stability is important and not the absolute value. A Peltier element
> is almost as easy to drive as a heater resistor, but dissipated heat
> probably makes the thermal design much more challenging.
>
> I am not an expert and there many questionmarks related air
> circulation, thermistor location and probably other things I can't
> even imagine.
>
> Will
>
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