Hi,
Thanks for your inquiry. Please see the attached "How to perform BMA253 self-test.pdf" and "How to do BMA253 inline calibration.pdf" which can be applied to BMA280 as well.
Due to the noise of intenral ADC, after inline calibration BMA280 x/y/z measurements or outputs will not be exactly at 0g and +1g when it is stationary and flat on your table. Instead, they should be very close to 0g and +1g. For example, if you select BMA280 BW to 125Hz which is 250Hz output data rate, then you should see the x/y/z outputs within +/-5mg with regrad to 0g and +1g.
Thanks.
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