CISPR 32 — Conducted Emissions Test Benchmarking Using Automated FFT & Stepped-Based Systems

Currently on the market, several competing FFT- based test solutions, defined in [1], [2] and [3] are available to perform conducted and radiated emissions tests. With the potential test time reduction, the traditional stepped based solutions are gradually being phased out and replaced by these FFT systems. However, the implementation of an automated FFT based system for conducted emissions tests should not be considered a simple replacement for traditional systems and may require special guidance, based on either the specific nature of the FFT based measurement system, or the type of device that is being measured. The following paper summarizes a conducted emissions test comparison carried out on several types of devices and several FFT based system configurations. With the aim of providing a guidance or reference for a transition stage between stepped to FFT test systems, the obtained results were analyzed and compared with a stepped-based test system using the test requirements defined in [3] for Conducted emissions test of AC Power mains ports.