LISN

A pseudo power supply circuit used to measure noise such as harmonics that a power supply circuit generates on the power source side. During noise measurement, the power supply circuit and load are connected to the outlet through a LISN. Noise is output as the noise terminal voltage of the LISN. There are two types of noise terminal voltage measurements: normal mode, which measures noise generated between input lines, and common mode, which measures noise generated between the input line and ground.