Multimeter & Oscilloscopes

Basic Concepts

It is important to know the types of signals there are, irrespective of whether it is a direct or alternating current. There are basically three types of signals:

Sinusoidal/Sine, With a waveform normally due to slow changes of the voltage level.

Square, Also commonly called digital, as there are two voltage levels and the change between both occurs very quickly.

Triangular – (not common in Automotive), It is only an instant at its maximum voltage level, therefore it forms rising peaks that can form two of a triangle.