User's Manual

21
7 - MOTION TRACKERS
The motion trackers provide 3D angular velocity (by using gyroscopes), 3D acceleration (by using
accelerometers) and 3D earth magnetic field (by using magnetometers). These are integrated
using sensor fusion algorithms to provide 3D special orientation of limb segments.
These motion trackers were specifically designed to be used in a clinical or ambulatory setting with
a minimum need of calibration procedures.
Operating conditions
The recommended operating temperature of the motion trackers is between -10°C and +50°C. If
operated outside this temperature range, performance may decrease or the motion trackers might
be damaged. Fast transient temperature fluctuations may cause significant temperature gradients
across the device.
The Motion Trackers contain the absolute possible minimum amount of ferromagnetic materials.
Nonetheless, some minor components can be magnetized permanently by exposure to strong
magnetic fields. This will render the calibration of the magnetometers useless. Therefore, it is
necessary to prevent exposure of the motion trackers to strong magnetic fields, such as close
proximity to permanent magnets, speakers, electro motors, among others. It is also advisable to
ensure that measurements, in particular calibration steps, are conducted in an area free of or with
minimal magnetic distortions.
The Motion Trackers should be protected from electrostatic discharges or sources of radiation, as
exposure to such sources will damage the internal electronics. The Motion Trackers should be
protected from violent handling such as drops on hard surfaces. Excessive shocks or violent
handling may damage the Motion Trackers.
The Motion Trackers, cables and tablet must be kept dry at all times. Condensation and water may
damage the internal electronics.
● Do not expose the Motion Trackers to strong magnetic fields or
electrostatic discharges
● Do not expose the Motion Trackers, charger or power supply to water or