User's Manual
Document MV0319P.N
© Xsens Technologies B.V.
MVN User Manual
104
19 Appendices
19.1 Lycra suit sizes overview
Table 7 is an overview of the typical height and weight of a subject that will fit into a given suit size.
While this is generally accurate, it is an indication, therefore test the suit size, to ensure that it is tight
enough to keep MTx’s in place during measurement while remaining relatively comfortable.
Table 7: MVN Lycra Suit sizes
Size
Body height
Weight
S
1.55 - 1.65 cm
5'1'' - 5'4'' ft.
50 – 65 kg
110 – 143 lbs.
M
1.65 - 1.70 cm
5'4'' - 5'6'' ft.
65 – 75 kg
143 – 165 lbs.
L
1.70 - 1.80 cm
5'6'' - 5'9'' ft.
75 – 85 kg
165 – 187 lbs.
XL
1.80 - 1.95 cm
5'9'' - 6'4'' ft.
85 – 95 kg
187 – 210 lbs.
XXL
Up
Up
Up
Up
19.2 Magnetic Disturbances
A common problem with inertial and magnetic sensing is the presence of large ferromagnetic objects
which may distort the detected magnetic field and change the perceived global north. MVN Studio has
a few functionalities built in, which can be used to prevent magnetic disturbance from disturbing
measurements. These features include the ability to view magnetic field distortion on the 3D animated
character. This is available live and on a recorded file. Additionally, on a recorded file, the magnetic field
can be seen graphically, or exported in the MVNX file for further checks.
19.2.1 Show magnetic disturbance
To determine the most appropriate location for your experiments or evaluate unexpected performance,
visualize disturbances in the magnetic field. Magnetic field properties are visualized by circles around
the hands, pelvis and feet in the ‘Preview & Recording’ window, at calibration stage (see Figure 62).
Most unknown disturbances are usually present in the floor (iron reinforced concrete structures), for this
reason, during the preview and recording stage, only the magnetic indicators at the feet are shown.
The color of the circle is a measure of the magnitude of the disturbance. The magnitude is based on
average magnetic field properties (such as the strength and dip angle) of all MT’s. There are three
indictor colors:
Green: the magnetic field at the MT is suitable to perform a calibration
Yellow: the magnetic field is disturbed, if possible look for another location
Red: the magnetic field is too disturbed to perform a calibration
The spheres can be switched on or off by clicking the show/hide magnetic disturbances icon.
Choose whether or not to always show or hide the magnetic disturbance indicators at >Options
>Preferences >Interface >Character >Display magnetic disturbances.