1、 IEC 60068-2-39 Edition 2.0 2015-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Environmental testing Part 2-39: Tests Tests and guidance: Combined temperature or temperature and humidity with low air pressure tests Essais denvironnement Partie 2-39: Essais Essais et lignes directrices: Essais combi
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20、NALE Environmental testing Part 2-39: Tests Tests and guidance: Combined temperature or temperature and humidity with low air pressure tests Essais denvironnement Partie 2-39: Essais Essais et lignes directrices: Essais combins de temprature ou de temprature et dhumidit basse pression atmosphrique I
21、NTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 19.040 ISBN 978-2-8322-2897-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publicat
22、ion from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 60068-2-39:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope and object . 6 2 Normative references 6 3 Terms and definitions 6 4 Testing 6 4.1 General
23、 . 6 4.2 Preferred combinations . 6 4.3 Initial measurement and functional performance test . 7 4.4 Test procedure 7 4.4.1 Preconditioning 7 4.4.2 Test with temperature and low air pressure 7 4.4.3 Test with temperature, humidity and low air pressure . 9 5 Final measurements 12 6 Information to be g
24、iven in the relevant specification . 12 7 Information to be given in the test report 12 Annex A (informative) Guidance on combined temperature or temperature and humidity with low air pressure testing 14 A.1 General . 14 A.2 Environmental effects . 14 A.3 Measurement of temperature 14 Bibliography 1
25、6 Figure 1 Example of test sequence with cold temperature and low air pressure . 8 Figure 2 Example of test sequence with dry heat and low air pressure . 9 Figure 3 Example of test sequence of temperature and humidity with low air pressure . 11 Table 1 Test severities . 7 IEC 60068-2-39:2015 IEC 201
26、5 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ENVIRONMENTAL TESTING Part 2-39: Tests Tests and guidance: Combined temperature or temperature and humidity with low air pressure tests FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comp
27、rising 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 Stan
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36、ormative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held re
37、sponsible for identifying any or all such patent rights. International Standard IEC 60068-2-39 has been prepared by IEC technical committee 104: Environmental conditions, classification and methods of test. This second edition cancels and replaces the first edition published in 1976 and constitutes
38、a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) preferred severities of the IEC 60068 series; b) combined temperature, humidity and low air pressure 4 IEC 60068-2-39:2015 IEC 2015 The text of this standard is based on t
39、he following documents: FDIS Report on voting 104/657/FDIS 104/661/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/IEC Directives, Part 2. A list of al
40、l parts in the IEC 60068 series, published under the general title Environmental testing, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the
41、 data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IEC 60068-2-39:2015 IEC 2015 5 INTRODUCTION Equipment and components are required to function without significant reduction in performance when subjecte
42、d to different environmental parameters. The combination of temperature, humidity and low air pressure may have certain effects on components and gaskets, for example. The type and severity of the environmental parameters depend on the operational, transport and storage environments to which the equ
43、ipment and components are subjected. The environmental effects on the performance of equipment in the tropics and subtropics are totally different from those in arctic regions. Individual environmental parameters cause a variety of different and overlapping effects on the equipment and components. T
44、he manufacturer attempts to ensure, and the user expects, that equipment and components will survive the environments to which they will be subjected throughout their useful life. This expectation can be assessed by exposure of the specimen to a range of simulated environmental parameters controlled
45、 in the laboratory. The severity of the environmental parameters is often increased to obtain meaningful results in a relatively short period of time. This allows assessment of the likely effects of applied environmental conditions. 6 IEC 60068-2-39:2015 IEC 2015 ENVIRONMENTAL TESTING Part 2-39: Tes
46、ts Tests and guidance: Combined temperature or temperature and humidity with low air pressure tests 1 Scope and object This part of IEC 60068 provides a description of test methods and guidance for testing of equipment or components under combined temperature or temperature and humidity with low air
47、 pressure tests. The object of combined testing is to investigate to what extent the equipment or components are affected by combined temperature or temperature and humidity with low air pressure tests. The method of combined tests detects electrical, mechanical or other physical variations. 2 Norma
48、tive references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments)
49、applies. IEC 60068-1, Environmental testing Part 1: General and guidance IEC 60068-2-78, Environmental testing Part 2-78: Tests Test Cab: Damp heat, steady state 3 Terms and definitions None. 4 Testing 4.1 General All values of test parameters such as cold, dry heat, low air pressure, humidity, exposure time and conditions such as state of operation and so on, should be selected from the IEC 60068-2 s
