LISNlaitteet

LISN-laitteet, or Line Impedance Stabilization Networks, are specialized electronic devices used primarily in electromagnetic compatibility (EMC) testing. They are designed to simulate the impedance of power lines and provide a standardized load for conducted emissions measurements. This ensures that the measurements are consistent and reproducible, which is crucial for compliance testing with various EMC standards.

The primary function of a LISN is to maintain a stable impedance across a wide frequency range, typically from 150 kHz to 30 MHz. This stability is essential for accurate measurement of conducted emissions from electronic devices. LISNs achieve this by incorporating inductors, capacitors, and resistors in a specific configuration that provides a low-pass filter characteristic. This configuration helps to isolate the device under test from the power source and any other potential interference.

LISNs are commonly used in laboratory settings for pre-compliance and compliance testing of electronic devices. They are often integrated into automated test systems to streamline the testing process. The use of LISNs ensures that the measurements are not affected by variations in the power line impedance, which can significantly impact the accuracy of the results.

There are different types of LISNs available, designed to meet various standards and requirements. Some LISNs are designed for single-phase power systems, while others are suitable for three-phase systems. The choice of LISN depends on the specific application and the standards that need to be met.

In summary, LISN-laitteet are essential tools in EMC testing, providing a stable and standardized load for conducted emissions measurements. Their use ensures that electronic devices comply with relevant standards and regulations, contributing to the overall reliability and safety of electronic products.