Electromagnetic Interference and Noise Suppression

TLDR: In this paper, the principles of interference modes and noise suppression are discussed, and techniques for achieving electromagnetic compatibility at the source and noise-free measurements for the monitor are presented, and the broad categories of interference coupling modes that introduce noise into a measurement system are capacitive, inductive, radiative, and common impedance.

Abstract: The measurement of signals in the presence of electromagnetic interference is subject to errors because the displayed signal is a resultant of the true signal and a noise signal. Proper suppression techniques may be adapted to minimize the noise signal. Noise suppression techniques include shielded cables and enclosures, proper grounding and optimal bundling, and routing of cables and electrical isolation obtained through optics, power line filters, and isolation transformers. This chapter discusses the principles of interference modes and noise suppression, and presents techniques for achieving electromagnetic compatibility at the source and noise‐free measurements for the monitor. The broad categories of interference coupling modes that introduce noise into a measurement system are capacitive, inductive, radiative, and common impedance. In general, interference between circuits is due to a combination of electric and magnetic coupling. The chapter conveys the general principles of electromagnetic compatibility.