Principles of Measurement Devices

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Principles of Measurement Systems

Fourth Copy

John S. Bentley Emeritus Professor of Measurement Devices University of Teesside

Pearson Education Limited Edinburgh Door Harlow Kent CM20 2JE England and Associated Companies throughout the world Check us out on the World Wide Web by: 1st published 1983 Second Copy 1988 Third Edition 1995 Fourth Copy published june 2006 © Pearson Education Limited 1983, 2006 The right of John G. Bentley to get identified as author of this work has been asserted simply by him with respect w a the Copyright laws, Designs and Patents Take action 1988. Almost all rights reserved. No a part of this newsletter may be produced, stored in a retrieval system, or transmitted in any type or in any respect, electronic, mechanical, photocopying, documenting or otherwise, without either the last written authorization of the author or a license permitting limited copying in the United Kingdom issued by the Copyright Certification Agency Limited, 90 Tottenham Court Highway, London W1T 4LP. ISBN 0 140 43028 your five British Library Cataloguing-in-Publication Info A catalogue record for this publication is available in the British Catalogue Library of Congress Cataloging-in-Publication Data The bentley, John S., 1943– Guidelines of measurement systems as well as John S. Bentley. next ed. g. cm. Comes with bibliographical references and index. ISBN 0-13-043028-5 1 . Physical instruments. 2 . Physical measurements. 3. Engineering instruments. some. Automatic control. I. Name. QC53. B44 2005 530. 8–dc22 2004044467 10 15 9 8 7 6 09 08 07 your five 4 3 06 05 2 one particular

Typeset in 10/12pt Moments by thirty five Printed in Malaysia The publisher's plan is to use newspaper manufactured from lasting forests.

To Pauline, Dorothy and Victoria


Preamble to the fourth edition Acknowledgements xi xiii

Part A


Standard Principles

The 1 . you 1 . two 1 . several 1 . some General Measurement System Goal and performance of measurement systems Structure of measurement devices Examples of way of measuring systems Stop diagram icons


several 3 5 5 several 9 9 15 18 21 thirty-five 35 thirty six 41 fifty-one 51 58 65 75 77 seventy seven 84 97 97 98 107 110 113

a couple of

Static Qualities of Measurement System Components 2 . one particular Systematic qualities 2 . 2 Generalised model of a system factor 2 . three or more Statistical attributes 2 . 4 Identification of static attributes – tuned The Accuracy of Dimension Systems in the Steady Express 3. you Measurement problem of a system of ideal factors 3. a couple of The problem probability density function of any system of nonideal elements three or more. 3 Problem reduction tactics Dynamic Characteristics of Way of measuring Systems some. 1 Copy function G(s) for standard system components 4. two Identification with the dynamics associated with an element 4. 3 Powerful errors in measurement systems 4. 5 Techniques for powerful compensation Launching Effects and Two-port Systems 5. 1 Electrical packing 5. 2 Two-port systems Signals and Noise in Measurement Systems 6. one particular Introduction 6. 2 Statistical representation of random indicators 6. three or more Effects of noises and disturbance on measurement circuits six. 4 Noises sources and coupling components 6. your five Methods of minimizing effects of sound and interference





viii MATERIAL 7 Trustworthiness, Choice and Economics of Measurement Devices 7. one particular Reliability of measurement systems 7. a couple of Choice of dimension systems six. 3 Total lifetime working cost a hundred and twenty-five 125 140 141

Part B

almost eight

Typical Measurement System Elements

Sensing Elements 8. you Resistive realizing elements almost 8. 2 Capacitive sensing...


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