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IEC60068-2-1英文版 环境测试低温
INTERNATIONAL lEC STANDARD 60068-2-1 Sixth edition 2007-03 Environmental testing Part 2-1 Tests Test A: Cold O IEC 2007 Copyright-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 permission in writing from the publisher International Electrotechnical Commission. 3. rue de varembe, Po Box 131, CH-1211 Geneva 20. Switzerland EC Conmission Electrotechnique Internationale PRICE CODE International electrotechnical commission MexAyHapoAHa升3 nektpoTeXHn4ecKa只 KOMMCCu 三● ee current catalogue 60068-2-1◎|EC:2007 3 CONTENTS FOREWORD 7 INTRODUCTION 1 Scope and object.… 2 Normative references 13 3 Terms and definitions 4 Application of tests for non heat-dissipating specimens versus tests for heat dissipating specimens…,,…,, :::a.a:a:a:日aa1:::.1:::a::::aa::: 15 ···: 15 4.2 Ascertaining high or low air velocity in the test chamber………… 4.3 Non heat-dissipating specimens 17 4. 4 Testing of heat-dissipating specimens 17 4.5 Temperature monitoring…………… 17 4.6 Packaging 17 4.7 Diagrammatic representations 1重重 17 5 Test description 19 5.1 General 19 5.2 Test Ab: Cold for non heat-dissipating specimens with gradual change of temperature 19 5.2.1 Object 19 5.2.2 General description 5.3 Test Ad: Cold for heat-dissipating specimens with gradual change of temperature that are powered after initial temperature stabilization 21 5.3. 1 Object 5.3.2 General description 5.4 Test Ae: Cold for heat-dissipating specimens with gradual change of temperature that are required to be powered throughout the test..........21 5.4.1 object 5.4.2 General description 21 5.4.3 Energizing the specimen 23 6 Test procedure 23 6. 1 Confirmation of performance 23 6.2 Working space 6.3 Thermal radiation 23 6.4 Specimen with artificial cooling 23 6.5 Mounting 25 6.6 Severities 25 6.6.1 Temperature 25 6.6.2 Duration 5 6.7 Preconditioning 25 6.8 Initial measurements 25 6. 9 Conditioning 25 6.10 ntermediate measurements 27 6.11 Final temperature ramp……… 27 6.12 Recovery 27 6.13 Final measurements 27 60068-2-1◎|EC:2007 5 7 Information to be given in the relevant specification.....................27 8 Information to be given in the test report 29 Figure1- Block diagram tests A∶cold…… ,19 60068-2-1◎|C:2007 7 INTERNATIONAL ELECTROTECHNICAL COMMISSION ENVIRONMENTAL TESTING Part 2-1: Tests Test A: Cold FOREWORD 1)The International Electrotechnical Commission(IEC)is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of iec is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. to this end and in addition to other activities, IEC publishes International Standards, Technical Specifications Technical Reports, Publicly Available Specifications (PAs)and Guides (hereafter referred to as"lEC Publication (s)"). Their preparation is entrusted to technical committees; any lEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the lEc also participate in this preparation. IEc collaborates closely with the International Organization for standardization (Iso)in accordance with conditions determined by agreement between the two organizations 2)The formal decisions or agreements of lEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National c 3)IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense while all reasonable efforts are made to ensure that the technical content of ec misinterpretation by any end user. 4)In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter 5)IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication 6) All users should ensure that they have the latest edition of this publication 7)No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs(including legal fees )and expenses arising out of the publication, use of, or reliance upon, this IEc Publication or any other IEC Publications 8)Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publ 9)Attention is drawn to the ibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights International Standard IEC 60068-2-1 has been prepared by IEc technical committee 104 Environmental conditions classification and methods of test This sixth edition cancels and replaces the fifth edition issued in 1990. It includes the revised text of the fifth edition amendment 1 issued in 1993 and amendment 2 issued in 1994 This sixth edition deals with cold tests applicable both to non heat-dissipating and heat dissipating specimens For non heat-dissipating specimens, Tests Ab and Ad do not deviate essentially from earlier issues. Test Ae has been added primary for testing equipment that requires being operational throughout the test including the conditioning periods 60068-2-1◎|EC:2007 9 The text of this standard is based on the following documents FDIS Report on voting 104/407/FD|s 104/410/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table This publication has been drafted in accordance with the ISo/EC Directives, Part 2 A list of all the parts in the IEC 60068 series, under the general title Environmental testing, can be found on the ec we bsite The committee has decided that the contents of this publication will remain unchanged until themaintenanceresultdateindicatedonthelecwebsiteunder"http://webstore.iecchin the data related to the specific publication. At this date, the publication will be reconfirmed withdrawn replaced by a revised edition, or amended 60068-2-1◎|C:2007 INTRODUCTION Relationship of suffixes between tests a: cold and tests b: dry heat he relationship of suffixes between Tests A: Cold, and Tests B: Dry heat, is shown in the following table Tests A: Cold Tests B: Dry heat Suffix letter Specimen Temperature Air velocity SpecimenTemperature Air velocity type change type change Withdrawn Withdrawn Non heat Gradual High preferred Non heat radua High preferred Withdrawn Withdrawn leat Gradual Low preferred Heat Gradual Low preferred dissipating Heat Gradual Low preferred Gradual Low preferred DisSipating powered throughout hroughout 60068-2-1◎|EC:2007 ENVIRONMENTAL TESTING Part 2-1: Tests- Test A: Cold 1 Scope and object This part of lEC 60068 deals with cold tests applicable to both non heat-dissipating and heat- dissipating specimens For non heat-dissipating specimens, Tests Ab and Ad do not deviate requires being operational throug hout the test, including the conditioning period uipment that essentially from earlier issues. Test Ae has been added primarily for testing eq The object of the cold test is limited to the determination of the ability of components equipment or other articles to be used, transported or stored at low temperature Cold tests cover by this standard do not enable the ability of specimens to withstand or operate during the temperature variations to be assessed. In this case, it would be necessary to use Ec 60068-2-14 The cold tests are subdivided as follows: Cold tests for non heat-dissipating specimens with gradual change of temperature, Ab Cold test for heat-dissipating specimens with gradual change of temperature, Ad with gradual change of temperature, specimen powered throughout, Ae The procedures given in this standard are normally intended for specimens that achieve temperature stability during the performance of the test procedure Temperature chamber(s) are constructed and verified in accordance with specifications Ec60068-3-5and|EC60068-3-7 Further guidance for dry heat and cold tests can be found in IEC 60068-3-1 and general guidance in IEC 60068-1 2 Normative references The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments ) applies lEC 60068-1: 1988, Environmental testing- Part 1: Genera/ and guidance lEC 60068-2-14, Basic environmental test procedures- Part 2-14 Tests- Test N: Change of temperature lEC 60068-3-1, Environmental testing- Part 3: Background information- Section one: Cold and dry heat tests 60068-2-1◎|EC:2007 lEC 60068-3-5, Environmental testing-Part 3-5: Supporting documentation and guidance Confirmation of the performance of temperature chambers lEC 60068-3-7, Environmental testing- Part 3-7: Supporting documentation and guidance Measurements in temperature chambers for tests A and b(with load) lEC 60068-5-2, Environmental testing- Part 5-2: Guide to drafting of test methods-Terms and definitions lEC 60721(all parts), Classification of environmental conditions 3 Terms and definitions For the purposes of this document, the definitions given in IEC 60068-5-2, as well as the following definitions, apply 3.1 low air velocity in the working space velocity of conditioning airflow within a working space which is sufficient to maintain conditions but low enough so that the temperature at any point on the test specimen is not reduced by more than 5K by the influence of the circulation of the air (if possible, not more than 0, 5 m/s) 3.2 high air velocity in the working space velocity of conditioning airflow within a working space, which in order to maintain conditions also reduces the temperature at any point on the test specimen by more than 5k by the influence of the circulation of the air 4 Application of tests for non heat-dissipating specimens versus tests for heat-dissipating specimens 4.1 General A specimen is considered to be heat-dissipating only if the hottest point on its surface measured in free air conditions (i.e. with low air velocity circulation), is more than 5 K above the ambient temperature of the surrounding atmosphere after temperature stability has been reached (see 4.8 of IEC 60068-1). When the relevant specification calls for a storage or transportation test, or does not specify an applied load during the test, the Cold Test Ab will apply 4.2 Ascertaining high or low air velocity in the test chamber Under standard atmospheric conditions for measurements and test (see IEC 60068-1)with an air velocity <0, 2 m/s achieved without induced air movement, the specimen shall be switched on or electrically loaded as specified for the low temperature at which the test is to be carried out When temperature stability of the specimen has been reached, the temperature of a number of representative points around or on the specimen shall be measured using a suitable monitoring device. The temperature rise that occurs at each point shall then be noted

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