AiM MyChron3 XG Log - Manual (Page 21)

Installing the “BIKE” speed sensor
The wheel speed sensor for bike installations belongs to the “magnetoresistive –
non contact” devices and it needs a magnetic trigger to pass the sensor face.
When mounting the sensor, please firmly install it on a self-made iron bracket and
make sure that the distance between the sensor and the magnetic trigger is
included between 15 and 8 mm (10 mm is the optimum value). Once the sensor
has been installed, please plug the sensor’s Binder connector in your MyChron 3
Gold.
How to power the gauge
The gauge must be powered by an external 9-15 VDC power source. Do not
exceed these limits.
Connect the red wire to the battery’s positive pole (+) and the black one to the
negative pole (-).
How to sample the RPM
The RPM signal may be sampled either from the ECU or from the coil.
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The RPM signal sampled from the ECU is a square wave signal (from 8
up to 50 V);
The RPM signal sampled from the coil is a high voltage RPM input (from
150 to 400 V) and must not be connected on the “RPM from ECU” input
(this event may seriously damage the gauge).
It is also reminded to connect either the RPM signal from the coil or the
RPM signal from the ECU, NOT both (this event creates shortcuts).
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