Key Features and Functions
The Com-Power LI-220A Line Impedance Stabilization Network (LISN) is in full compliance with both CISPR 16-1-2 and ANSI C63.4. It provides the necessary measurement platform for performing power line conducted emissions compliance testing as required by most worldwide standards for commercial products. The LI- 220A performs each of the following functions during the measurement:
• provides a defined, stable impedance across the measure - ment frequency range; and,
• isolates the EUT and measurement circuit from the power source, thereby minimizing its influence on the measure - ments; and,
• couples the disturbance voltages to the coaxial measure - ment port for connection to the measuring instrument.
This LISN uses air-core inductors to prevent saturation and permeability variation. The mounting plate of the LI-220A is left unpainted in order to facilitate connection to earth ground in its installation, which is essential due to high leakage current.
The LI-220A is a dual-conductor network capable of handling currents up to 20 Amps (AC) per line. The EUT power port is fitted with a universal, multi-configuration receptacle, which accomodates almost any EUT plug without the need for adapters. The power input port is fitted with a standard IEC C20 receptacle. As shown in the diagrams on the right, the LI-220A can be installed into any type of power system, including DC, single-phase, dual-phase and even three-phase systems.
