What is a Line Impedance Stabilization Network (LISN)?

Line Impedance Stabilization Networks (LISNs) are used in conducted emissions testing to ensure consistent and repeatable measurement conditions by presenting a defined impedance to the equipment under test. These devices are specified in standards such as CISPR 16 and are essential for measuring noise generated on power lines. A LISN isolates the test setup from external power supply noise while coupling the RF disturbance voltage to a measurement instrument such as an EMI receiver or spectrum analyzer.

A typical LISN consists of inductors and capacitors arranged to block high-frequency noise from the power source and direct it toward the measurement port. Key performance parameters include impedance characteristics, frequency range, current rating, insertion loss, and isolation. The standardized impedance ensures that measurements are consistent across different test environments, enabling comparison with regulatory limits. LISNs are available for single-phase and three-phase systems, as well as for DC power lines.

Modern LISNs are designed to handle a wide range of power levels and provide stable performance over the specified frequency range, typically from 150 kHz to 30 MHz or higher. They often include features such as transient protection, selectable measurement ports, and built-in attenuation to protect measurement equipment. Proper grounding, cable routing, and installation are critical to achieving accurate results, as the LISN must be correctly integrated into the test setup to maintain its defined impedance characteristics.

Line Impedance Stabilization Networks are widely used in EMC compliance testing, product certification, automotive electronics validation, industrial equipment testing, and consumer electronics development. They play a key role in ensuring that conducted emissions measurements are accurate, repeatable, and compliant with international standards. Their ability to provide a controlled measurement interface makes them an essential component in EMC test setups.

The Largest Database of Line Impedance Stabilization Networks (LISNs)

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