Quote:
Originally Posted by AlexN
I missed this post earlier..
They are a single stage TEC as the website says. -40°c Δ is not difficult to achieve with a single stage TEC depending on the power consumption of the element. A sufficiently power hungry single stage TEC could achieve almost any ΔT. However I think manufacturers of astro CCD's have to stick with lower power TECs in order to reduce both electrical noise, and power consumption of the camera.. Sure it would be nice to achieve -60°C Δ T, but if it required 12v 10A to do it you probably wouldnt be so impressed..
Dark frames I've seen from a few different KAF8300 based cameras seem to indicate that anything below -10°c gives very acceptable results, and anything much lower than -20°c seems to make little difference.. I've seen dark frames from the ML8300, QHY9, Apogee U8300M and QSI583 at varying temps from 0°c to -30°c...
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Yeah -20°C sounds about right Alex. It would be interesting to see your power settings to achieve this with a single peltier though. Last night was about 20°c and Maxim showed camera temp at -20°C and power settings varying between 58 -61% on my QHY9.
Mark