Difference between revisions of "AMTI Force Plate Setup"

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==Step 2: Software Setup==
 
==Step 2: Software Setup==
  
Install Motive (see the setup guide for more help).
+
Install Motive (see the [[Quick Start Guide]] for more help).
  
 
Your force plates should come with some installation files. For AMTI these file are contained on a disk. Install the program Netforce because netforce contains the configuration program and can validate that the force plates are working. (Note: The force plate drivers should install automatically, but you may need to manually point to the Gen 5 device drivers.)
 
Your force plates should come with some installation files. For AMTI these file are contained on a disk. Install the program Netforce because netforce contains the configuration program and can validate that the force plates are working. (Note: The force plate drivers should install automatically, but you may need to manually point to the Gen 5 device drivers.)

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Step 1: Hardware Setup

To install plug each force plate into a separate Gen 5 amplifier, plug a USB 2.0 type B to A cable from each amplifier to your computer, then set up the camera system as normal (see Hardware Setup page).


USB System + Force Plate

For better synchronization using the Ethernet camera system, connect an eSync2 your camera system, then connect the eSync2 and your Gen 5 amplifer(s). To connect the two use one of the “50 Ohm BNC Male to 75 Ohm RCA Jack Adapters” included with the eSync as well as an RCA male to male cable.

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Ethernet System + Force Plate

FP EthernetWiring.png

For better synchronization using the USB camera system you can do one of two things. Connect an eSync2 your camera system, then connect the eSync2 and your Gen 5 amplifer(s). To connect the two use one of the “50 Ohm BNC Male to 75 Ohm RCA Jack Adapters” included with the eSync as well as an RCA male to male cable.

If you have multiple force plate you should connect a BNC to RCA cable from one optihub to one force plate since each optihub only has one output. You can use a BNC signal repeater, that should work fine, but a signal splitter is not guaranteed to work because of the drop in electricity. (Ask Anthony if you need more detail on this).

Step 2: Software Setup

Install Motive (see the Quick Start Guide for more help).

Your force plates should come with some installation files. For AMTI these file are contained on a disk. Install the program Netforce because netforce contains the configuration program and can validate that the force plates are working. (Note: The force plate drivers should install automatically, but you may need to manually point to the Gen 5 device drivers.)

Run either the system configuration program AMTISystemConfig.exe or the same app through Netforce detect your force plates and press save. (Note: If you have multiple hard drive you may need to move the configuration file to C:\AMTI\CFG\AMTIUsbSetup.cfg. Motive should alert you if this has not been done properly.)

Installation Note: If you install AMTI, then Motive everything should work fine. However, if you install Motive, the AMTI you may run into Visual Studio Redistributed 2010 issues.


Step 3: Motive Setup

1) If you did step 1. correctly when you open motive you should see force plates with the numbers 1+.

FP FirstOpened.png


2) Calibrate the volume as normal to get the orientation of cameras.

FP CaibCameras.png


3) Pull the force plate alignment tabs out and put the force plate levelings jigs on the bottom on the calibration wand.

FP WandAlignment.png


4) Place the Calibration wand with the corner of the force plate to the right of where the cable input is located. The direction matters. (Also the nice looking image on our website is the wrong direction.)

FP WandFP.jpg


5) Select the CS-400 markers in Motive then right click the force plate you want to assign to that position, and click Set position.

FP SetPosition.png


6) After you have set all of your force plate’s with steps d+e, remove the CS-400 from your force plates. Right click one of your force plates and Zero(all). This will set the current force on the plate to 0.

FP Zero.png


7) Now your force plates will be ready to use!


Step 4: Recording Force Plate Data in Motive

  1. Open the project Pane (or cameras pane) and Timeline Pane. Open the editor in the Timeline Pane. Select your force plate. Then select one of Fx, Fy, Fz, Mx, My, or Mz to view the live force plate data. You may use this to confirm that your force plates are working.

FP FPGraph.png


  1. Open the cameras Pane and the Synchronization Pane.

REMEMBER: The BNC to RCA cord goes from the eSync or OptiHub output (BNC) into the force plate (RCA).


Ethernet System Force Plate Sync Configuration

    1. If you are using the eSync and a prime (ethernet system): In the synchronization pane select “Custom Synchronization” set sync input > Source = Internal clock. Set sync input > Clock Freq = 2000. Set Sync input > Input divider = 20. Set Sync output 1-4 > Type =Record Start/Stop Pulse. Then click apply. Then in the Cameras Pane select the force plates group. In Properties at the bottom select sync source = Free Run. It should look something like the following (change this to 1000 and 10):

FP EthernetCustomSync.png


Supported frame rates: 2000, 1800, 1500, 1200, 1000, 900, 800, 600, 500, 450, 400, 360, 300…etc These values can be found in the AMTI System Configuration Program.


USB System Force Plate Sync Configuration

If you are using a Flex (USB 2.0 system): In the synchronization pane select “Custom Synchronization” set External Sync Output > Type = Recording Level. It should look something like the following:

FP USBCustomSync.png


Note: the sync for the OptiHub may not be as true of a sync as the eSync.


The OptiHub only has one output BNC sync port. So you can only reliably do one force plate, but it may be possible to use a BNC splitter to increase this number. (It depend of the sensitivity of the force plate's receiver.)

Supported frame rates: 2000, 1800, 1500, 1200, 1000, 900, 800, 600, 500, 450, 400, 360, 300…etc These values can be found in the AMTI System Configuration Program.

If you are not using the eSync, but are using a prime system: Ignore the Synchronization pane. Just make sure that in the cameras pane that the force plate FPS is a multiple of the tracking FPS, ex 100fps and 1000fps. The issue with this method is that because there is no master synchronization device there might be drift in the data and the data will not trigger at the same time. This can be an issue for longer takes and if you want your system to be timed perfectly. Motive should alert you if your cameras and force plates do not have rates that work.


Supported frame rates: 2000, 1800, 1500, 1200, 1000, 900, 800, 600, 500, 450, 400, 360, 300…etc These values can be found in the AMTI System Configuration Program.


This is what it will look like if you don’t have the force plate sample rate as an integer multiple of the frame rate,

FP RateMismatch.png


Record some force plate data!!!


Step 5: Exporting/Streaming Force Plate Data

  1. Streaming data is very easy to do on Motive’s side. Just open the Data Streaming Pane and turn on “Broadcast Frame Data”. Make sure that you are not streaming over the camera network. Then you are good to stream into another program. We recommend Visual3D for any bio-mechanics streaming or data reading.
    1. Ask Morgan or Jeff about how to get this working. You can use pre-recorded data to verify that the workflow they tell you works!
    2. Real-time streaming into Visual3D uses Visual3DServer plugin provided by C-Motion: http://www.c-motion.com/v3dwiki/index.php/Visual3DServer_Overview
  1. You may also export to C3D as long as there is at least one marker in your recording. This is just straight forward exporting. You can open the exported C3D files in Visual3D which is out recommended bio-mech analysis software.