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Hi Mark i use gain 3 and Offset 112.
Maxim keeps the temp +/- 0.5 C on my setup and when i set it on -20 it goes to -20 no more and no less so it is not normal that you have a large fluctuation and the temp goes to -20 or more when it is set to -10.
I am not using nitrogen (just warm air while assembling) and never get the chip frozen over.
You better talk to Theo about this strange behavior, it might be something simple.
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