WT901C RS232| manual v0707 | http://wiki.wit-motion.com/english
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Step 5. Judge the result--confirm if there is 1g on Z-axis acceleration
1. After1 ~ 2 seconds, the three axial acceleration value of the module is
about 0, 0,1, the X and Y axis Angle is around 0°. After calibration, the x-y
axis Angle is accurate.
Note: When putting the module horizontal, there is 1g of gravitational
acceleration on the Z-axis.
2.3.2 Magnetic Field Calibration
Purpose:
Magnetic calibration is used to remove the zero bias of the magnetic field
sensor. Usually, the magnetic field sensor will have a large zero error when it is
manufactured. If it is not calibrated, it will bring a large measurement error,
which will affect the accuracy of the measurement of the z-axis Angle of the
heading Angle.