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Electrical interferences in electrical measurement systems demystified

Journal article
Authors Lars Bengtsson
Published in International Journal of Electrical Engineering Education
Volume 49
Issue 2
Pages 101-113
ISSN 0020-7209
Publication year 2012
Published at Department of Physics (GU)
Pages 101-113
Language en
Keywords coupling, decoupling, cross-talk, grounding, shielding
Subject categories Electronic measurement and instrumentation, Datatransmission, Electronics


This paper is concerned with the practical aspects of protecting an electrical measurement system against different kinds of interfering cross-talk. We categorize different kinds of cross-talk, describe their origin and how to decoupled them in order to protect the system. This presentation is a primer for students or application engineers concerned with the practical operation of an electrical measurement system. We explain cross-talk phenomena with a minimum of electromagnetic theory, focusing more on understanding the origin of cross-talk in terms of basic electric and magnetic circuits rather than advanced electromagnetic wave equations, and how to decouple them. Compared to a typical textbook presentation on the subject, this work categorizes all kinds of electromagnetic interferences (EMI), using a minimum of mathematic equations, and clearly explain their origin and illustrates clearly how each one is decoupled.

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