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ADXL206 zero G shifting

Regarding the ADXL206 zero G shifting, I conducted a test on a board with three ADXL206 on it one for each axis.

I set it up in an oven an conducted a temperature test wit a 1°C/minute ramp-up/down. I ran the test two times and processed the data output to convert it into Gs.

The attached graphic shows the results, two of the three accelerometers were repeating but the X axis was off for a significant amount.

Is there a repeatibilty problem with these accelerometers?