The Line Impedance Stabilization Network, or LISN, as it is commonly called, is used for the measurement of conducted emissions on power lines. The basic setup for the conducted emissions test is as shown in Figure 1. The LISN gets its power from the ordinary wall outlet and feeds the power to the Equipment Under Test (EUT). Any RF noise generated by the EUT is separated by the LISN and fed to the spectrum analyzer for measurement or recording