ActivBody Activforce 2, Руководство пользователя

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Measuring Range of Motion
The Activforce 2 device can also measure angular displacement for range of motion testing.
While the device is calibrating, make sure that the device is being held still in the starting
position.
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Do not rotate the Activforce 2 device in multiple axes during a measurement.
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Do not move the Activforce 2 device in multiple planes of motion during a measurement.
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Do not rotate the device during the brief calibration period before the application starts
the range of motion measurement.