Intermediate frequency noise in and from electrical power network in modern working places

Abstract

This study presents the measurement results of high frequency noise in mains electrical system in workplaces. Measurements were taken both directly connected to the mains power network and from inside the facilities by measuring electromagnetic fields. The results show great differences from one place to another, indicating large usage of switching power supplies, even possible problems in electrical wiring or faulty or inadequately shielded/filtered electrical equipment. The study also encompassed experiments.