Coda AMPLIFIER 15.0 Guia do Utilizador descarregar pdf (Página 38)

Charnwood Dynamics Ltd. Coda cx1 User Guide – Coda Basics I - 1

CX1 USER GUIDE - COMPLETE.doc 26/04/04

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Force Platforms (Option)

Force platforms, which provide analogue outputs, can be interfaced to the Codamotion

system through either an ADC-64 data acquisition unit or a suitably configured cPCI active

hub unit. Portable force platforms can also be supported directly on a serial interface

(RS232 or USB). The Codamotion Analysis software handles the calculations required to

convert raw force signals to force vectors for use in segmental gait analysis. Codamotion

Analysis can be configured to support force platforms manufactured by Kistler, AMTI or

Bertec and portable force platforms made by AMTI.

Hardware

The six or eight output signals from the force platform amplifiers are connected to one of

the analogue input connectors on the ADC-64 unit or the cPCI active hub system. (The

ADC-64 unit is connected to the host PC via an ISA DSP32 interface card). For the case

of the portable force platform, the comms cable plugs directly into the serial port (RS232

or USB) of the host computer.

Configuration

Codamotion Analysis may be configured to use the ADC-64 data acquisition unit or the

cPCI active hub system in the configuration file Codasys.cfg. The configuration file

specifies the ADC-64 serial number, DSP board program file and ADC-64 calibration data

file.

The force platform configuration is also specified in Codasys.cfg and includes: the

platform type (1 = Kistler 9281B, 2 = Kistler 9286, 3 = Kistler 9261…, 10 = AMTI BP2416,

11 = AMTI-LG6, 12 = AMTI-OR6-7, 20 = AccuSway/AccuGait, etc), the calibration file

name (e.g. Coda\FP1.cal), the centre of pressure correction coefficients for Kistler plates,

the calibration matrix for AMTI plates, the ADC-64 unit/cPCI board and channel group to

which the force plate amplifiers are connected (if applicable), the serial port number to

which the force plate is connected (if applicable), the force plate orientation (rotation = 0,

90, 180, 270), the cover-mat thickness (if any), and the centre offset (x,y,z).

Normal orientation is with the long side of the platform parallel to Coda, and with the cable

outlet on the Coda side. The Rotation value for this orientation is 0. The force plate may

be rotated by 90°, 180°, or 270° from the normal orientation - the rotation angle is

clockwise as seen from above.

In all cases, the Coda axes must be aligned exactly parallel/perpendicular to the force

platform axes, in all three directions, and the origin must be set at the specified offset

position relative to the centre of the plate.

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Coda AMPLIFIER 15.0 Guia do Utilizador Página 38