Table of Contents
RT Plugin AMTI Gen5 Type7
Overview
The AMTI Gen5™ Type 6 Plugin is only used in Visual3D Server™; it connects to AMTI™ hardware.
Plugin Interface
The “Plugin Help” button leads to this web page should you need to reference this page in the future.
The “About Plugin” button has details on the plugin being used including version, release date, copy right, support contact information and the hardware SDK version.
Frame Info
 |
Current frame The current frame number on the top left hand side on the screen (where it currently reads ……) keeps a count of the current frame which is assigned by the hardware or software system.
Missed frames The missed frames number is on the bottom left (where it currently reads ……). Whenever there is a gap in frames sent by the hardware of software system a blank frame is inserted. The dropped frames count keeps a record of both the number of frames which are blank.
Hardware time The hardware time number is on the top, in the centre (where it currently reads …..). This time stamp is created by the hardware being used and is how long, in milliseconds, the hardware has been running.
Server time The server time number is on the bottom, in the centre (where it currently reads …..). This time stamp is created by the server and is how long, in milliseconds, it has been connected to the hardware or software which is streaming to it.
Hardware latency The hardware latency is on the top right hand side (where it currently reads ….. ms). This indicated the delay created by the hardware system.
Server latency The hardware latency is on the top right hand side (where it currently reads ….. ms). This indicates any delay introduced by the server.
Hardware
 |
Units
The Units setting are only available in Metric and may either be set to Unconditioned or Conditioned. Unconditioned allows the signal conditioner to act as a traditional analog amplifier. Conditioned uses the signal conditioner to invert the sensitivity matrix to eliminate cross-talk. It also allows the signal conditioner to correct for channel excitations, channel gains, cable length, and bridge resistances.
Genlock
There are three options for Genlock, off, on (rising edge), and on (falling edge). Genlock is used only when there are more than one system in use (i.e. the force platforms and a camera system). It allows the systems to be synchronized and is set on the back of the force platform amplifier. The Genlock works by sending regular electrical pulses to the computer. Setting Genlock to off will tell the computer to ignore these pulses. Setting the Genlock to on (rising edge) means that the computer will acknowledge the pulse when it reaches it's maximum strength. Setting the Genlock to on (falling edge) means that the computer will acknowledge the pulse as it dissipates.
Frequency
While force platforms generated an analogue signal it is necessary to convert the analogue data into digital frames in order to process it and in order to use it along side digital data, such as what is generated by a camera system. In order to divide the analogue signal into frames of data you must specify the rate at which you would like to sample the data. The frequency for sampling is measured in Hertz, where 100 Hz is 100 frames per second. Frequency may be set between 10 and 2000 Hz. If there is no digital system (i.e. camera system) in use then the frequency set may be based on user preference. However, in order to use the force platform data with other digital data the force platform frequency must be divisible by the frequency of the other data.
Zero Force Plate
When the Zero Force Plate button is used it will reinitialize the force platform hardware by resetting the channels to their lowest level. This allows you to define a level of zero force, which is useful if there is something covering the force platform.
Hardware Specifications Table
The Hardware Specifications Table has a list of the hardware units that are connected to Visual3DServer. Not all hardware systems will populates all four columns as not all manufacturers number in four distinct ways on their hardware. The first column “Name” has the make of the hardware (AMTIGen5 for example) and the number of the hardware piece, in case there are more than one type of the same make and model (1, 2, 3 . . .). The second column “Model” lists the hardware model number. The third column “Rev.” lists the hardware Revision number which is used by certain hardware system manufacturers and is specific to the piece of hardware. The fourth column “Serial” lists the serial numbers of the hardware pieces which are connected.
Edit Force Plate
 |
The Edit Force Plate button will open the Edit Force Plate Window as seen to the right.
At the top of the window is a drop down menu which allows you to select which force platform you would like to make changes to. In the sample picture it is set to FP1.
To the far right of the window is the Device Channel list. This cannot be adjusted but provides a readout of channels which are being used by the force platform
The Geometry section of the window includes the Origin, the Corners, and the Width and Height. The Origin indicates where the Origin (0,0,0) is located relative to the force platform's co-ordinate system. Values are in meters and can be altered by the user. The Corners are the co-ordinates of the each of the force platform's corners relative to the lab co-ordinate system. Values are measured in meters and can be altered by the user. There are three buttons associated with the Corners section which allow the user to easily manipulate where the force platform is located in the lab co-ordinate system. The Reverse button allows the user to change the numbering of the force platform corners making the numbering go counter clockwise if it is initially set at clockwise. This has the result of changing which direction the force platform decides is up. The Rotate button allows the user to twist the force platform in place in increments of 90 degrees. The Translate button allows the user to move the force platform along any of the three axis (x, y, and z) by the magnitude that is entered. The Width and Height is provided to the computer by the Visual3DServer by the force platform and it can be changed by the user if they change the locations of the corner co-ordinates to describe a force platform with different dimensions.
Signals
 | The table in the signals tab holds all of the numerical data from various sources which is being streamed to the program. This data may include, but is not limited to, marker co-ordinates, force data, EMG readings, accelerometer data, etc. The first column entitled “Label” has the number or name which has been assigned to the source of the data. The following four columns are all entitled “Value”; they have the numerical data associated with the source. For markers it is the x, y, and z, coordinates and then the residual. For force data there is only one value associated, which is the magnitude of the force. |
 | The signals graph allows you to see a graphical representation of the values in the table. Selecting one of the rows in the table will cause the graph to record the values in real time. The x axis has the frame numbers and the y axis has the numbers in the value column. If more than one column has data there will be multiple lines drawn. The graph uses the MKS system of units. |
C3D Params
 | When this tab is viewed in Visual3D Server it gives additional details regarding the data that is being collected by the server and streamed to a client. This allows you to check details such as force plate types and locations. The top table contains a list of the parameters and their subsections. By expanding the parameters and selecting one of the subsections the data from the subsection will be presented in the table at the bottom of the tab. |
Force Platform
 | The minimum force management box is for screening out unwanted noise from the force platforms. The default value is 20.00 N meaning that any force equal to or lower than 50.00 N will not be displayed by the system. It does not affect forces that are greater than the specified limit. The minimum force may be set at any value between 0 and 9,999.90 N. The baseline force measurement tool allows you to determine the average amount of noise present in your force platform system and remove it from the forces displayed by the system and sent to any client programs such as a biofeedback software. The baseline frame number is set at 10 which means that the baseline function will take a sample of 10 consecutive frames. The frame number may be set at any whole number from 1 to 9,999. When you click the “Measure Baseline” button it will take a sample of frames (as many or as little as indicated by the baseline frame number box.) The average force will be calculated for these frames. This value will subsequently be subtracted from all of the following frames. The graphics displayed and the data passed on to any client programs will be the initial value minus the calculated average. When the “Zero Baseline” button is pressed the forces will no longer have the baseline number subtracted and the forces displayed and given to any client programs will be the value taken from the force plate. Both force management tools may be used at the same time. The “Use force structure” checkbox controls the force structure, which is the amalgamation of multiple forces. If the checkbox is not selected then the force structure will not be calculated. This means that the force structure will not appear in the graphics and that the data for a force structure will not be available for any client programs. |