Microlab PRO-1 User Manual Page 48

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GPX Pro Manual43
© 2009 XT Racing
wheel, and a "pickup" which detects the magnet passing by.)
To increase accuracy, the more "pickup spots" you can utilize on the wheel, the better. The
pickup spots should be as evenly spaced around the wheel as possible.
The pickup must output a digital signal of at least 0-5V amplitude, up to 0-12V amplitude.
The GPX supports from 1 to 99 pickup points per wheel speed input.
In addition, you must enter the circumference of the tire, in millimeters. The more accurate you
can determine that circumference, the more accurate the results will be.
1.7.3.7 Suspension
The GPX can acquire suspension data on any of the analog channels.
Suspension is usually determined from a linear potentiometer, which basically is a sliding
resistor.
A typical linear potentiometer has 3 wires -- positive voltage, ground, and the output signal.
Depending on the extension of the slider, the output signal's voltage will vary continuously
between the positive voltage and ground.
For the GPX, the positive voltage should be connected to a voltage between +3V and +5V. A
convenient source of +3V is the RED WIRE OF CABLE "B".
Basic calibration of the potentiometer involves measuring the voltage when it is fully
compressed, measuring the voltage when it is fully extended, and specifying how many
millimeters of travel the slider moved from the fully compressed to the fully expanded position.
You may perform this calibration either before it is mounted to the vehicle, or after it has been
mounted.
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