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

LM-1 Aux Input Cable and RPM Converter
1. Introduction
The LM-1 Aux Input Cable #2 (RPM-converter) is an auxiliary device for the LM-1 Lambda Meter.
The Aux Input Cable allows the connection of up to 5 analog inputs for data logging to the LM-1.
The RPM converter converts RPM pulses from various sources to an analog 0-5V voltage and
allows the connection of up to 4 additional analog inputs for data logging to the LM-1. For details
on the analog signal inputs see chapter 7.
The RPM-converter can either be used with an inductive clamp (similar to an ignition timing light
clamp) or with a pulsed RPM signal from other sources (like tach output signals from ECU's or
electronic ignition systems).
As set up by the factory, the RPM-converter is programmed for 1 pulse for every 2 crank
rotations as can be expected when using the ignition clamp on the spark wire of one cylinder
(non waste-spark ignition).
The RPM-converter can be user-programmed for different numbers of pulses per crank rotation,
as described below.
Figure 1. Aux Input Cable #2 (The RPM converter)
The Setup button on the RPM converter is used to program the RPM-converter for different
pulse numbers per crank rotation as described in chapter 6. The Indicator LED will be steadily on
when the RPM-converter detects a valid RPM signal. The Aux 2-5 screw terminals allow the
connection of other sensors from your car.
You can only hook up Aux-input signals whose voltage never
exceeds 5V and does not go below ground. Failure to heed this warning
may cause damage to either the LM-1 or the RPM-converter.