XT Racing GPX Pro, Руководство пользователя

Страница: 45 / 95

GPX Pro 41
© 2009 XT Racing
Since the accelerometers are highly sensitive, it is important that for accurate readings, the GPX
be mounted FIRMLY on a SOLID part of the vehicle.
Do not mount the GPX to a surface that is subject to excessive
vibration or movement.
1.7.3.6 Wheel Speed
The GPX can acquire wheel speed data on either channel 1 (digital/analog) or channel 5 (digital
only).
In order to acquire wheel speed, the wheel needs to have a hall-effect (magnetic) or similar
pickup which determines the rotational speed of the wheel. (Another example might be an
infrared or laser source which gets "interrupted" by a disc with holes that is mounted to the
wheel.)
(A simple example is the bicycle computer. It consists of a magnet attached to a spoke of the
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.