Answering your Questions about Power Design  

Understanding LISNs Is Essential To EMI Pre-Compliance Testing


A line impedance stabilization network (LISN) is a circuit used for testing power supply line conducted emissions produced by either a power supply or some other type of product that contains a power supply. if you are designing power supplies or using power supplies in a system design, chances are you’ll need to meet certain requirements for conducted emissions and you’ll need to know enough about LISNs to perform pre-compliance testing of your product. This article explains the basics of how LISNs work and are used, identifies some of the applicable standards, and then analyzes the differences between the LISNs specified by two FCC (Part 15.207 and Part 18.307 of Title 47) standards. The LISNs are shown in ANSI C63.4-2017 and IEEE Std. 1560TM-2005. In this analysis, the authors discuss the implications of the component differences in their LISNs so engineers can understand when these differences affect testing and when they don’t. This analysis also illustrates a basic approach to evaluating LISN requirements for other standards.

What you’ll learn:

  • How to understand the operation and use of LISNs in conducted emissions testing
  • How to evaluate LISN requirements of various conducted emissions standards

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Author & Publication:

Kevin Parmenter, Chair, and James Spangler, Co-chair, PSMA Safety and Compliance Committee , How2Power Today, Oct 16 2017

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