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Force plates data can be acquired through the analog capture functionality of a Vicon connectivity device (Vicon Lock+ or MX GiganetMX Giganet). This topic describes the analog connection only. If your force plate has a digital output, it is possible that this data stream can also be captured, but this depends on the data stream's format and the equipment's manufacturer. For information on the digital data streams that can be used with Vicon systems, contact Vicon Support.
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For more information, see:Table of Contents
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See also Force plate properties in the Vicon Nexus Reference Guide.
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To view force plates in a 3D Perspective view, ensure the Force Plates check box on the left side of the Options dialog box is selected. You can change the following options:Table of Contents
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Force Plate section
| Property | Description |
|---|---|
| Draw Plate | When selected, the force plate appears in the View pane. |
| Draw Number | By default, each force plate displays a number (e.g., 1, 2, 3). The number corresponds to the order in which the force plates appear in the System Resources tree. You can turn off the number display by clearing the check box. |
| Draw Axes | You can configure how the force plate axes appear in the 3D Perspective view by selecting the Draw Axes check box. The axes appear below the floor plane of the volume. |
| Axis Width | Width of the axis. Set the axis width by typing a value or by moving the slider. |
| Axis Length | Length of the axis. Set the axis length by typing a value or by moving the slider. |
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- Press F7 to open the Options dialog box.
- On the left click ForcePlates.
- In the Properties pane on the right, in the Force Vector section, change the Force Threshold (N) to the required value (the default is 25 N).
Regardless of the setting of the Force Threshold in the System Resources pane, the force force vector that is displayed in the view pane is below the threshold that is set in the Options dialog box. For example, if you set the value to 10 in the System Resources pane, but left it at 25 in in the Options dialog box, a value of 15 would be prevented from causing flickering, but would be recorded in saved trials.
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- In the Options dialog box (press F7), on the left, click ForcePlates and in the Properties pane on the right, in the Force Vector section, ensure Draw Combined Force Vector is selected.
- In the System Resources tree, CTRL+click to select the required outputs from each force plate.
Ensure you select identical outputs from each force plate.Scroll pagebreak 
In a Graph view, in the Graph type list, select Combined Forceplates.
Scroll pagebreak In the Graph view, the combined output you selected is displayed.
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- For ease of use, align the Vicon world Y-axis with with the direction of walking on the treadmill. To achieve this, you can either move the treadmill in the laboratory to align with the Vicon world axes in Nexus, or change the Vicon world axes to align with the position of the treadmill. You can then set the incline of both plates of the treadmill by adjusting the X Orientation property of the force plate.
- Assuming you follow this advice so that the direction of walking on the force plates aligns with the Vicon Y-axis, and the left-right (medial-lateral) direction aligns with the Vicon X-axis, inclination of the force plate will correspond to a rotation of the plate about its X-axis. For example, to set a 10 degree inclination of the treadmill, you would set a 10 degree X (deg) rotation in the plate's Orientation properties.
- Each capture must use only one inclination of the treadmill. If you need to capture multiple inclinations, to enable you to switch easily between different inclinations, create a number of separate system files: one for each required inclination.