产品设计的电磁兼容性.pdf

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EMC for Product Designers
Third edition
Tim Williams
Newnes
OXFORD AUCKLAND BOSTON JOHANNESBURG MELBOURNE NEW DELHI
Newnes
An imprint of Butterworth-heinemann
Linacre House. Jordan Hill. Oxford OX2 8DP
225 Wildwood Avenue. Wobumm. MA 01801-2041
A division of Reed Educational and Professional Publishing Ltd
A member of the Reed Elsevier plc group
First published 1992
Reprinted 1994(four times
Second edition 1996
Reprinted I996,1997,1999,2000,2001
Third edition 2001
C Tim Williams 2001
All rights reserved. No part of this publication
may be reproduced in any material form
(including photocopying or storing in any medium by electronic
means and whether or not transiently or incidentally
to some other use of this publication without the
vritten permission of the copyright holder except in
accordance with the provisions of the Copyright,
Designs amd Patents Act 1988 or under the terms of a
licence issued by the Copyright Licensing Agency Ltd,
90 Tottenham Court Road, London, England WIP OLP.
Applications for the copyright holders written permission
to reproduce any part of this publication should be addressed
to the publishers
British Library Cataloguing in Publication Data
A catalogue record for this book is available from the British Library
ISBN0750649305
Printed annd bound in Great Britain
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Preface
The most popular TV programme in the UK over Christmas 1991 was Auntie Bloomers
Millions of viewers watched a selection of clips from the BBCS archives, showing various
well known television personalities at embarrassing moments while the camera was running,
clips that never made it o the final pro amme For significant fraction of hese viewers, their
enjoyment would have been spoilt by a bloomer of another kind. In the first half of 1985
before service charge was introduced the UK'S Radio Investigation Service was receiving an
average of 1900 complaints a month relating o broadcast reception, and about 80%of the
RIS resources were devoted to domestic radio and TV reception problems. Spots, hash,
snowstorms, colour and vision dis ortion and occasionally complete loss of picture are all
symptoms of the same cause-electromagnetic interference
It is imitating for the viewer when the picture flickers or is wiped out during a crucial
programme, just as it is imitating for a music lover who has carefully taped an importan
broadast on M radio only to find at the uiet passages ruined by the intrusion of the
neighbours electric drill. It is far more critical when the emen ency services are unable to
communicate within a city e because their radio si als a obscured by the electromagnetic
smog emitted by thousands of computer terminals in the buildings around them
The coexistence of all kinds of radio sevices, which use the lectromagnetic spectrum to
convey information, with technical processes and products from which electromagnetic enerry
is an undesirable by-product, creates the problem of what is knowm as electromagnetic
compatbility(EM). The solution is a compromise radio services must allow for a certain
degree ofinter erence, but interfering emissions may not exceed a certain level, which normally
involves measures
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