Black Box IEEE 1284 Guide de l'utilisateur télécharger pdf (Page 16)

Page 16 of 98 The Black Box Toolkit

5. DETECTION INTERFACES & SENSORS

5.1. Opto-detectors

Up to four opto-detectors can be used to monitor for screen events that occur on a remote

PC or data projector screen. As standard the toolkit offers two opto-detector inputs via

lines 3 and 4. 3.5mm jack plugs are used to connect photodiode opto-detectors to the

toolkit. Two tuning potentiometers above the sockets allow you to fine tune sensitivity

(crossing threshold) to suit the stimulus materials being displayed. A yellow LED indicates

that visual activity has been detected. Two opto-detectors are shipped as standard.

The photodiode opto-detector is attached to the remote PC by means of an adjustable

elastic strap. The clear polycarbonate mounting allows for accurate positioning over a

visual stimulus.

If required two additional opto-detector modules [optional extra] can be used allowing for

up to four visual regions to be monitored. If you purchased these external modules they

can be plugged into the 3.5mm powered-in lines of the toolkit (lines 3 and 4). A sensitivity

potentiometer is located on the plug-in module itself. The orange LED of the powered-in

lines indicates that visual activity has been detected.

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Black Box IEEE 1284 Guide de l'utilisateur Page 16