Oscilloscope monitors the signal behaviour over a set period of time, displaying the pattern as a function against a two-directional coordinate system. They are also capable of transforming non-electric signals like vibration or sounds and displaying it as a function. They are commonly required to control and fine-tune settings of an electric device. Modern oscillographs are usually small hand-held devices with a display, which shows monitored signal (several signals if necessary), and three control sections - vertical section, horizontal section, and trigger section. These devices use probes to connect to a desired signal.

Oscillographs can measure amplitude, minimum, maximum, average and mean voltages, rise and fall time, period, duty cycle and frequency of an electric signal. These parameters are required to establish the strength and behaviour of the signal. In order to begin working with the device you should attach the electric probe to the source of a signal, adjust the controls to monitor and demonstrate the signal you desire in a fitting form and start taking the measurement.