Line impedance

When viewed from the power source side at the end of a power line, such as a commercial power outlet, this refers to the impedance. When measuring conducted noise transmitted through the power line, if the line impedance is low, the noise is displayed lower than its actual level, and if the impedance is high, the noise is displayed higher than its actual level. Therefore, it is a factor that causes errors in noise measurement. To eliminate noise measurement errors caused by line impedance, a Line Impedance Stabilization Network (LISN) is used.