ISO INTERNATIONAL STANDARD 10553 Secondedition 2018-11 Horology Procedure for evaluating the accuracy of quartz watches Horlogerie - Procedure d'évaluation de la précision des montres a quartz Reference number IS0 10553:2018(E) osi @IS02018 IS0 10553:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0 10553:2018(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions ..1 4 Symbols and units ..1 5 Practical factors affecting accuracy .2 5.1 General. .2 5.2 Accuracy. .2 5.3 Influence of temperature on accuracy .2 5.4 Accidents or abnormal environment. .2 6 Types of measurement .2 7 Test methods. .3 7.1 General test conditions .3 7.2 Ageing test programme .3 7.3 Temperature simulation test programme 4 7.4 Uncertainty of measurement. .5 8 Calculation of accuracy .6 8.1 General .6 8.2 Calculation of the effect of ageing on accuracy 6 9 Relationship between the calculated accuracy and the accuracy classification indicated....8 10 Indication of the accuracy classification .8 11 Reliability Annex A (normative) Statistical evaluation of accuracy Annex B (informative) Evaluation of coefficients aα and c from the differences of rates ..12 Annex C (informative) Reliability ..14 Bibliography .15 @ IS0 2018 - All rights reserved ii