OK, im now trying to do static calibrations again. Using a completely new box without any foam, just glued on some spacers for mounting the AQ board.
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But I still get noisy/uneven curves on the ACC at the begynning...
This is from another try:
This is another try from a previous location a another box with foam:
Starting to get a bit frustrated, I have tried at least 5-6 times now at 3 different locations, with 2 different boxes with and without foam. I have freezed down the AQ both with and without the SD card in.
And the result is the same, noisy/uneven ACC curve at the begynning, so I´m starting to think it maybe is the ACC sensors that are unstable at this low temperature?
I have glued on the recoms with a gluegun as it said in the assembly guide, could it be that this glue is reacting to the cold temperature and is somehow affecting the accelerometer on the board?