Patent ID: 6937024

Claim:
A multiple test system for use in vehicles for measuring characteristics of an engine including an Electronic Control Unit (ECU), a power transistor and an ignition coil, comprising: first and second analogue signal receiving sections each for receiving an input signal in the form of a high voltage waveform, which is generated from an ignition plug, through a connection channel of an external signal; a non-inverting amplifier for amplifying a first analogue signal inputted from the first analogue signal receiving section; a comparator for comparing a reference voltage, which is set by applying a predetermined value of voltage, with a second analogue signal inputted from the second analogue signal receiving section; a microcomputer having a program for converting the analogue signal generated from the non-inverting amplifier into a first digital signal, converting the second analogue signal into a second digital signal based upon an output signal from the comparator, applying the reference voltage to the comparator, and controlling the system according to calculation and measurement modes of the converted digital signals; and a liquid crystal display section for displaying measurements outputted from the microcomputer section.