IEC_60738-1-2009.pdf

IEC 60738-1Edition 3.1 2009-07INTERNATIONAL STANDARD Thermistors Directly heated positive temperature coefficient Part 1:Generic specification IEC 60738-1:2006+A1:2009(E)QC 440000 LICENSED TO MECON Limited.-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,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 permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office 3,rue de Varemb CH-1211 Geneva 20 Switzerland Email:inmailiec.ch Web:www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.?Catalogue of IEC publications:www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,withdrawn and replaced publications.?IEC Just Published:www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.Just Published details twice a month all new publications released.Available on-line and also by email.?Electropedia:www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary online.?Customer Service Centre:www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance,please visit the Customer Service Centre FAQ or contact us:Email:csciec.ch Tel.:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC 60738-1Edition 3.1 2009-07INTERNATIONAL STANDARD Thermistors Directly heated positive temperature coefficient Part 1:Generic specification INTERNATIONAL ELECTROTECHNICAL COMMISSION CKICS 31.040.30 PRICE CODEISBN 2-8318-1048-7QC 440000 Registered trademark of the International Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60738-1 IEC:2006+A1:2009(E)CONTENTS FOREWORD.5 1 Scope.7 2 Normative references.7 3 Terms and definitions.8 4 Units and symbols.16 5 Preferred values.17 5.1 Climatic categories.17 5.2 Marking.17 5.3 Spacings.18 6 Quality assessment procedures.18 6.1 General.18 6.2 Primary stage of manufacture.19 6.3 Subcontracting.19 6.4 Structurally similar components.19 6.5 Qualification approval procedures.20 6.6 Rework and repair.27 6.7 Release for delivery.27 6.8 Certified test records of released lots.28 6.9 Delayed delivery.28 6.10 Alternative test methods.28 6.11 Manufacture outside the geographical limits of IECQ NSIs.28 6.12 Unchecked parameters.28 7 Test and measurement procedures.28 7.1 General.28 7.2 Standard conditions for testing.29 7.3 Drying and recovery.29 7.4 Visual examination and check of dimensions.30 7.5 Zero-power resistance.30 7.6 Temperature coefficient of resistance.31 7.7 Insulation resistance(for insulated types only).31 7.8 Voltage proof(for insulated types only).32 7.9 Resistance/temperature characteristic.32 7.10 Dissipation factor at Umax().33 7.11 Response time by ambient temperature change(ta).34 7.12 Response time by power change(tp).34 7.13 Thermal time constant by ambient temperature change(a).35 7.14 Thermal time constant by cooling(c).35 7.15 Robustness of terminations.37 7.16 Solderability.38 7.17 Resistance to soldering heat.39 7.18 Rapid change of temperature.40 7.19 Vibration.40 7.20 Bump.40 7.21 Shock.41 LICENSED TO MECON Limited.-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60738-1 IEC:2006+A1:2009(E)3 7.22 Climatic sequence.41 7.23 Damp heat,steady state.42 7.24 Endurance.43 7.25 Tripping current and tripping time.47 7.26 Non-tripping current.47 7.27 Residual current.47 7.28 Surface temperature.48 7.29 Inrush current.49 7.30 Mounting(for surface mount thermistors only).49 7.31 Shear(adhesion)test.50 7.32 Substrate bending test.51 Annex A(normative)Interpretation of sampling plans and procedures as described in IEC 60410 for use within the IEC quality