14
VIII.
CALIBRATION
When to calibrate?
Your MOTIONPOD™ has been calibrated during the manufacturing. Calibration consists in adjusting
certain parameters for offset and to obtain standardized measurements. However, over a long
period of time, or after a magnetic shock, the sensors are likely to drift. It is then necessary to
calibrate.
Depending on the software solution you have purchased, there is a measurement stability indicator
for angular data recording. Irregularity on accelerometer measures can be due to a very fast
movement. The software will probably request re-recording with a slower gesture. If
magnetometers are responsible for the anomaly, it is more likely because there are magnetic
disturbances in the environment. In all other cases, it is necessary to calibrate.
It is recommended to calibrate MOTIONPOD™ manually before any procedure. Calibration lasts 30
seconds and it is well guided by the provided MotionDevTool v2.0.4 Software. It mainly performs
measurements, and has menus to calibrate the MOTIONPOD™ according to the procedure described
below.
How to calibrate?
Here’s the best way to calibrate the MOD:
-
Be sure that the zone where the calibration is carried out is free from any magnetic
disturbance (refer to section VII).
-
Take the sensor in hand, put your elbows on a wooden table and maintain the
MOTIONPOD™ with your fingers.
-
It is advised to have your face oriented north
-
Rotate the MOTIONPOD™ with your fingers according to 3 axes of rotation:
o
around the arrow figuring on the antenna
o
around an axis perpendicular to this arrow
o
around an axis perpendicular to the antenna (the MOTIONPOD™ “rolls” like a wheel)
o
other additional random rotations can be made
Be sure to maintain the MOTIONPOD™ in the same position, in a sphere of 5cm of
diameter. Carry out slow movements without acceleration, nor shock
