Paragraph Number

126

In certain embodiments, the calibration circuit 340 determines a reference axis 130. The calibration circuit 340 may include one or more sensors 530 to facilitate determining the reference axis 130. The sensor 530 may be a level sensor, tilt sensor, or another type of sensor. The sensor 530 can determine a horizontal plane and the calibration circuit 340 may determine a reference axis 130 based on that determined horizontal plane. The In certain embodiments, the calibration circuit 340 and/or measurement circuit 330 may utilize the same sensors (e.g., a common accelerometer). In another embodiment, the calibration circuit 340 and measurement circuit 330 may each use separate sensors 510, 530.

Added by DJM 1 2022