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Hi Sir,
I have a question for the e-compass of my smart watches.
In factory, we have e-compass streaming test, could you give more explaination for this test ?
also in user mode, we can calibrate the e-compass via "8", how does it happen ?
Besides this, what does "low accuracy" and “high accuracy" mean ?
Thanks.
Solved! Go to Solution.

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Hello Bruce,
Generally speaking, if you rotate a 3-axis magnetometer in 3D space slowly with Figure-8 motions, you can collect a lot of data points of [Bx, By, Bz]. If you plotted these data points in 3D you would find out that these data points form a sphere or an ellipsoid with the center shifted from the origin [0, 0, 0]. Then the offset would be [x0, y0, z0] so that you can subtract it to each data point and future data points so that the sphere or ellipsoid is centered at origin.
Best regards,
Tomas
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There's test data value changes--> Pass"

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Hello Bruce,
Generally speaking, if you rotate a 3-axis magnetometer in 3D space slowly with Figure-8 motions, you can collect a lot of data points of [Bx, By, Bz]. If you plotted these data points in 3D you would find out that these data points form a sphere or an ellipsoid with the center shifted from the origin [0, 0, 0]. Then the offset would be [x0, y0, z0] so that you can subtract it to each data point and future data points so that the sphere or ellipsoid is centered at origin.
Best regards,
Tomas
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Hi Sir,
Thanks for the explaination of the "8" motion.
Could you explain something for self-test and stream test ?
Thanks.
