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The System Testing Rod consists of
a solid metal rod pointed at both ends and measuring exactly one meter in
length from tip to tip. Five smaller rods are positioned perpendicular to
the longitudinal axis and each fitted with a spherical reflective marker.
One of the rods is positioned to eliminate symmetry. Two rectangular, metal "plates" supplement the main device. One of these plates is positioned on a force platform while the other is held by the human operator standing next to the platform. A small conical indentation on each plate receives one of the pointed ends of the main device minimizing contact and friction. Data collection using both the 3D motion capture camera system and the force plates begins, and an operator moves the top plate and matching end of the System Testing Rod around in large smooth motions, all the while keeping the rod "sandwiched" between the plates. The weight of the device and downward forces exerted by the operator are detected and recorded with the force platform. At the same time, motion capture data using the reflective markers on the device are recorded by the camera system. Computers can then use these data to assess and report
the combined performance of the force platform and the motion capture
system. The System Testing Rod provides a quick and easy means to indicate
whether or not the measurement systems are configured, calibrated, and
implemented properly.
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For
more information about the Clinical Center,
e-mail occc@cc.nih.gov, or call Clinical Center
Communications, 301-496-2563.
Warren
Grant Magnuson Clinical Center
National
Institutes of Health
Bethesda, Maryland 20892-7511