[volt-nuts] Precision resistor testing

[Andreas Jahn]

Hello,

I would  use the peltier only in cooling mode and a heater foil for heating.
(as you can see in eevblog)
One reason is that you have to switch off the peltier for about 5 
minutes to cool down before reversing.
otherwise it works as a generator and possibly may shoot through your 
power stage.
The other is that its simpler to control the temperature by a PWM heater 
than
with a peltier which needs clean DC voltage for maximum lifetime and 
efficiency.

with best regards

Andreas


Am 15.11.2014 um 22:48 schrieb Richard Moore:
> Thanks for the replies — I have all I need except an environmental test chamber to control temp. Of course, right now, I could stick the box outside and drop its temp by 20C — but I really only need a range of 20C +/- 5C. But as it turns out, I have a little portable insulated cooler/heater box for holding drinks and food in the car that has a big reversible Peltier block in it, so maybe I can finesse this temp testing…
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