Hi Shimmer users,
This morning I played with a single Shimmer3 sensor and watched the
plots of magnetometer x, y, z (all CAL) on the fly. I placed the sensor
on a table, and slowly rotated it while keeping one of its face in full
contact with the table surface. I found one of the axes (which is Cal Z)
remained roughly constant so I believe the Z axis points up. What
confused me is that the other two components are mostly negative during
the rotation, especially one of them never had a positive value no
matter how much I rotated it.
How to explain this? Even if some electrical device in the room had
impact on the local magnetic field, the combined field (with earth
magnetic field) should point to certain direction. I would very much
appreciate it if someone could shed a light on the confusion. Thank you
very much.
Best,
Weiguang
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