Innovate Motorsports LM-1 RPM Converter (Aux. Input Cable 2) - Manual (Page 5)

3.1 Inductive Clamp Usage
- Plug the inductive clamp's 3.5mm audio plug into the inductive clamp input of the RPM
converter.
- Clamp the Inductive Clamp on the spark plug wire of one cylinder so the wire is completely
surrounded by the clamp.
- Make sure the clamp is completely closed.
- Plug the RPM-converter in the LM-1 unit.
- Start the engine.
- Switch on the LM-1 unit.
The indicator LED on the RPM-converter should light up steadily. The indicator light indicates
when a valid RPM signal is detected. If it does not light up, or lights up intermittently, reposition or
reverse the clamp (try clamping it upside down). If the LED goes out only occasionally, that is
OK. The RPM converter will still convert, though its output might be noisy. A noisy output has
spikes or lengthy flat areas in the data log. [Note: to work properly with the inductive clamp
pickup the RPM converter must be set up for the appropriate number of pulses per crank
rotation.]
• For a 4 stroke engine without waste spark ignition, this would be 1 pulse per 2 crank
rotations. This is the factory setting.
• For a 4 stroke engine with waste spark ignition, or a 2 stroke engine, this would be 1 pulse
per crank rotation.
• For a rotary engine, this would be 3 pulses per rotation. This is the same as for a 6-cyl 4-
stroke before the distributor.
Note: On any distributor-less ignition system you can alternately clamp the inductive
clamp around one of the power wires on the primary side of the ignition coil or coil-on-
plug module.
4. Using the RPM-Converter with pulsed RPM input (Tach) signals
- Unplug the inductive clamp from the RPM converter if connected.
- Connect the RPM signal to the RPM pulse input screw terminal.
- Plug the RPM-converter into the LM-1 unit.
- Start the engine.
- Switch on the LM-1 unit.
The indicator LED on the RPM-converter should light up steadily. The indicator light indicates
when a valid rpm signal is detected. If it does not light up, check your connections.
DO NOT CONNECT A PULSED RPM SIGNAL TO THE INDUCTIVE CLAMP INPUT. THIS
MIGHT DAMAGE THE RPM-CONVERTER OR LM-1. Again, this should just result in an
error code, not mechanical damage.
In most cases the ground connection of the RPM converter is required only if the other Aux
Inputs (2-5) are used.