[sdiy] Peltier Elements

[Czech Martin]

This is true. Also water condensation is becomming a large
problem.
When do I need cooling the most: during summer.
Exactly when humidity is high. Cooling even to 15C might
cause large amount of condensation, thus corrosion.
Peltier elements that are not completely sealed
will die first ;-<

Fortunately the cold time of the year conicides with more
time for diy. So, if I have cold air on the other side
of the window, I coud try to pump that into the chamber.
There should be no condensation problem.

Today it was 7C outside...
I think air temperature is below 15C from September to May or June.
So there is only July-August where I can not measure all points
of the curve.

I also think that only the most critical circuits need
evaluation below 20C, however there is some doubt if extrapolation
is allowed....

Considering the condensation problem and this climate facts
I think that I should stay away from active cooling...

m.c.

-----Original Message-----
From: ASSI [mailto:Stromeko at compuserve.de]
Sent: Mittwoch, 14. Mai 2003 22:19
To: synth diy
Subject: Re: [sdiy] Peltier Elements


On Tuesday 13 May 2003 23:31, Magnus Danielson wrote:
> With peltier elements you might even be able to get a -20 °C sample.

Martin talked about a temperature chamber, which I envisioned as 
something you can put a complete VCO in for instance. For such an 
arrangement it becomes increasingly difficult and expensive to 
controllably maintain more than 10K...15K below ambient, especially 
when the DUT is producing around 1W or so of heat of it's own. It is no 
accident that commercial equipment for that purpose uses a large, noisy 
refrigerator (often enough water cooled themselve - with chilled water 
that is) to cool down (and dry) air that is then used to cool the 
specimen.


Achim.
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