Line impedance stabilization network

For measuring EMI, we need to use an ISN ( Impedance Stabilization Network ). In off-line power supplies, this becomes a LISN (Line Impedance Stabilization Network) — also called an AMN (Artificial Mains Network). See Figure 9-2 for a simplified schematic. Note that the LISN, as recommended for CISPR-22 compliance, is detailed in CISPR 16. 

---