Black Box IEEE 1284 Guía de usuario descargar pdf (Pagina 28)

Page 28 of 98 The Black Box Toolkit

Next turn down the sensitivity as far as possible so that the activity LED on the toolkit is

unlit. Then gradually increase the sensitivity until the activity light just illuminates. If you are

using a CRT you may see the light flicker as the CRT beam redraws the screen or with a

TFT it will be constantly lit. You should bear in mind that you may need to increase or

decrease the brightness or contrast of your own monitor as well. Ideally all levels should

be as close to those used in a real experimental setting as possible.

As a final check you should run the “Sensor Threshold Check” on the BBTK host. This

small utility virtualises the activity LEDs on the front of the BBTK and helps you fine tune

sensitivity. Depending on which opto-detector you are using you should see the virtual

LED illuminate (lines 3 and 4) and the decimal “Port Val” change.

Note: Due to the high gain circuitry

used within the opto-detectors it is

possible to overload them if the

sensitivity is set too high or they are

positioned over a very bight area of the

screen. This will be evident as the

activity LED will remain constantly

illuminated regardless of the sensitivity

setting. To correct this disconnect

power to the BBTK for a few seconds.

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Black Box IEEE 1284 Guía de usuario Pagina 28