ISO INTERNATIONAL STANDARD 7565 First edition 1993-09-01 ANSI Internat Doc Sec Micrographics Readers for transparent microforms Measurement of characteristics Micrographie -Appareils de lecture de microformes -- Mesurage des caracteristiques ISO Referencenumber ISO7565·1993(E) ISO7565:1993(E) Contents Page 1 Scope 2 Normative references 3 Definitions 4 Magnification 4.1 Apparatus 4.2 Procedure 3 5 Resolution 3 5.1 Test charts 3 5.2 Magnifier 3 :5.3 Procedure 3 6 Geometricdistortion 3 6.1 Test film 3 6.2 Procedure 3 7 Screen luminance 5 7.1 General conditions 5 7.2 Procedure 6 Screen contrast 6 8 8.1 Apparatus 6 8.2 Screen contrast measurements 9 Film gate temperature measurements 8 9.1 Apparatus 8 9.2 Procedure ISO1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher International Organization for Standardization CasePostale56:CH-1211Geneve20:Switzerland Printed in Switzerland ISO7565:1993(E) Annexes A Importance of the luminance measurement 9 A.1 Screen characteristics 9 A.2 Screenobservation 9 A.3 Evaluation of screen diffusion characteristics 9 B Field method using a luxmeter 12 B.1 Presentation 12 B.2 Method 12 ili