`
`Eighth edition
`
`Edited by
`The British Computer Society Schools Committee
`Glossary Working Party
`
`Arnold Burdett
`
`Diana Burkhardt
`
`Alan Hunter
`
`Frank Hurvid
`
`Brian Jackson
`
`John Jaworski
`
`Tim Reeve (Chairman)
`
`Graham Rogers
`
`John Southall
`
`a--llla--
`111111111111111
`111111111111111
`11111111111111'
`on behalf of the British Computer Society
`
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`
`
`Longman Group Limited
`Longman House, Burnt Mill, Harlow
`Essex CM20 2JE, England
`and Associated Companies throughout the world
`
`© British Infonnatics Society Ltd 1995
`
`All rights reserved; no part of this publication may be reproduced, stored in a
`retrieval system or transmitted in any form or by any means, electronic,
`mechanical, photocopying, recording or otherwise without the prior written
`permission of the publishers or a licence permitting restricted copying in the
`United Kingdom issued by the Copyright Licencing Agency Ltd, 90
`Tottenham Court Road, London WlP 9HE.
`
`First published by the British Computer Society 1977
`Fourth, fifth and sixth editions published by Cambridge University Press
`Seventh edition published by Pitman Publishing 1991
`Eighth edition published by Longman Group Limited 1995
`
`British Library Cataloguing in Publication Data
`A catalogue entry for this title is available from the British Library
`
`ISBN 0-582-27544-X
`
`Produced by Longman Singapore Publishers Pte Ltd
`Printed in Singapore
`
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`160
`
`Communications Devices and Control Devices
`
`87
`
`Sampler
`also known as: digital sampler
`is an elctronic circuit which takes samples of an electronic signal at intervals
`and stores them for future processing. In particular, they are used to take
`frequent measurements of analog signals for converting an analog signal into
`a digital signal, when it is known as a digital sampler.
`
`Sensor
`including: analog sensor, digital sensor, active device, passive device
`is a transducer (see above) which responds to some physical property such as
`pressure, rate of flow, humidity, the proximity of ferrous metal. The sensor
`produces an electrical output which is either analog or digital. Some sensors,
`called passive devices, require no external electrical source. Those which
`require an external voltage are called active devices.
`
`Servo mechanism
`also known as: servo
`is a mechanical mechanism for remote control of machines. A simple form is
`the motors which operate the control surfaces of a radio-controlled model
`aircraft, where the person flying the model plays an active part continuously
`adjusting the position ofthe control levers. Servos can be controlled
`electronically through computer circuits which may incorporate feedback to
`achieve automatic control; in these situations human participation may be
`very limited.
`
`Actuator
`is any device which can be operated by signals from a computer or control
`system causing physical movement. For example, devices for opening
`windows in a compute-controlled ventilation system.
`
`Stepper motor
`sometimes : stepping motor
`is an electric motor which moves in small rotational steps. Suitably
`controlled and geared, a stepper motor can provide very small discrete
`movements, for example, the movement of the paper rollers and the print
`head in a printer. The control circuits may well involve the use of.feedback
`(see page 39).
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