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Charnwood Dynamics Ltd. Coda cx1 User Guide

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

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Introduction

One of the many benefits conferred upon Codamotion users is the economy of effort

resulting from the many time-saving features and overall user-friendliness of the system.

In spite of this, the task of installing and configuring the system for the first time may seem

a daunting one.

The flexibility of the Codamotion system is such that the user may have chosen options

ranging from a single Coda cx1 scanner unit, to a ‘full house’ comprising several

scanners, simultaneous video capture, twin force platforms, optically telemetered EMG

and, perhaps, digital triggers, all kept in check by the powerful Codamotion Analysis

software running on a suitably configured computer with a Microsoft Windows

based

operating system.

It is essential, therefore, that you read this user-guide very thoroughly, at least to the end

of the first part, before embarking upon any campaign of movement analysis.

Hardware

The Coda cx1 is a general-purpose 3-D Motion tracking system, with interfacing for

synchronous analogue and digital data acquisition (e.g. Force-plate, EMG).

The measurement unit contains three pre-aligned solid-state cameras which track the

position of a number of active markers (infra-red LEDs) in real-time.

Sampling rates

Sampling rates are selectable from 1Hz up to the upper limits defined below for different

numbers of markers in use.

100Hz for up to 56 markers

200Hz for up to 28 markers

400Hz for up to 12 markers

800Hz for up to 6 markers

Measurement time

The maximum measurement time depends on a combination of the sampling rate and the

total number of markers being tracked. For example, with 28 markers (sampling rates of

200Hz or below), the maximum measurement times are:

100s at 200Hz, 200s at 100Hz, 400s at 50Hz, 800s at 25Hz, ... to 20000s at 1Hz.

With 12 markers, the sampling rate can be increased to 400Hz while maintaining a

maximum measurement time of 100s. Likewise, with 6 markers at 800Hz, the maximum

measurement time is still 100s.

As the number of markers decreases, the maximum measurement time can be increased

proportionally for a given sampling rate. For example, at 200Hz with only 1 marker, the

maximum measurement time is increased to 2800s.

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Coda AMPLIFIER 15.0 Guía de usuario Pagina 10