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Cool thread, no pun intended. Thanks for all the info.
It does make me think I should be running cooler with the Apogee U16M with D9 cooling package. During winter running at a -30c set point, TEC power is only at 20%, so I wouldn't have any challenge in getting the camera down to -40c or -50c. A few months ago I had the camera serviced by Apogee. They tested the camera at -62c below ambient according to the test report, no doubt this is in a controlled environment. During summer, I don't like running the TEC power higher the 80%. If I run at a set point of -30c all year round, TEC never reaches this. I refresh the calibration library every three months with a quick script that I run on a night where the weather is bad.
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