IEC_60068-3-2-1976_scan.pdf

NORMEINTERNATIONALEINTERNATIONALSTANDARDCEIIEC68-3-2Premire ditionFirst edition1976Essais fondamentaux climatiqueset de robustesse mcaniqueTroisime partie:Informations de baseSection deux Essais combins temprature/basse pression atmosphriqueBasic environmental testing proceduresPart 3:Background informationSection Two Combined temperature/low air pressure testsIECNumro de rfrenceReference numberCEI/IEC 68-3-2:1976LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Validit de la prsente publicationLe contenu technique des publications de la CEI est cons-tamment revu par la CEI afin quil reflte ltat actuel dela technique.Des renseignements relatifs la date de reconfirmation dela publication sont disponibles auprs du Bureau Centralde la CEI.Les renseignements relatifs ces rvisions,ltablis-sement des ditions rvises et aux amendements peuventtre obtenus auprs des Comits nationaux de la CEI etdans les documents ci-dessous:Bulletin de la CEIAnnuaire de la CEIPubli annuellementCatalogue des publications de la CEIPubli annuellement et mis jour rgulirementTerminologieEn ce qui concerne la terminologie gnrale,le lecteur sereportera la CEI 50:Vocabulaire Electrotechnique Inter-national(VEI),qui se prsente sous forme de chapitresspars traitant chacun dun sujet dfini.Des dtailscomplets sur le VEI peuvent tre obtenus sur demande.Voir galement le dictionnaire multilingue de la CEI.Les termes et dfinitions figurant dans la prsente publi-cation ont t soit tirs du VEI,soit spcifiquementapprouvs aux fins de cette publication.Symboles graphiques et littrauxPour les symboles graphiques,les symboles littraux et lessignes dusage gnral approuvs par la CEI,le lecteurconsultera:la CEI 27:Symboles littraux utiliser en lectro-technique;la CEI 417:Symboles graphiques utilisables sur lematriel.Index,relev et compilation des feuillesindividuelles;la CEI 617:Symboles graphiques pour schmas;et pour les appareils lectromdicaux,la CEI 878:Symboles graphiques pour quipementslectriques en pratique mdicale.Les symboles et signes contenus dans la prsente publi-cation ont t soit tirs de la CEI 27,de la CEI 417,dela CEI 617 et/ou de la CEI 878,soit spcifiquementapprouvs aux fins de cette publication.Publications de la CEI tablies par le mmecomit dtudesLattention du lecteur est attire sur les listes figurant lafin de cette publication,qui numrent les publications dela CEI prpares par le comit dtudes qui a tabli laprsente publication.Validity of this publicationThe technical content of IEC publications is kept underconstant review by the IEC,thus ensuring that the contentreflects current technology.Information relating to the date of the reconfirmation ofthe publication is available from the IEC Central Office.Information on the revision work,the issue of revisededitions and amendments may be obtained from IECNational Committees and from the following IEC sources:IEC BulletinIEC YearbookPublished yearlyCatalogue of IEC publicationsPublished yearly with regular updatesTerminologyFor general terminology,readers are referred to IEC 50:International Electrotechnical Vocabulary(IEV),whichis issued in the form of separate chapters each dealingwith a specific field.Full details of the IEV will besupplied on request.See also the IEC MultilingualDictionary.The terms and definitions contained in the present publi-cation have either been taken from the IEV or have beenspecifically approved for the purpose of this publication.Graphical and letter symbolsFor graphical symbols,and letter symbols and signsapproved by the IEC for general use,readers are referredto publications:IEC 27:Letter symbols to be used in electricaltechnology;IEC 417:Graphical symbols for use on equip-ment.Index,survey and compilation of the singlesheets;IEC 617:Graphical symbols for diagrams;and for medical electrical equipment,IEC 878:Graphical symbols for electromedicalequipment in medical practice.The symbols and signs contained in the present publi-cation have either been taken from IEC 27,IEC 417,IEC 617 and/or IEC 878,or have been specifically appro-ved for the purpose of this publication.IEC publications prepared by the sametechnical committeeThe attention of readers is drawn to the end pages of thispublication which list the IEC publications issued bythe technical committee which has prepared the presentpublication.LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.NORMEINTERNATIONALEINTERNATIONALSTANDARDCEII EC68-3-2Premire ditionFirst edition1976Essais fondamentaux climatiqueset de robustesse mcaniqueTroisime partie:Informations de baseSection deux Essais combins temprature/basse pression atmosphriqueBasic environmental testing proceduresPart 3:Background informationSection Two Combined temperature/low air pressure tests CEl 1976 Droits de reproduction rservs Copyright all rights reservedAucune partie de cette publication ne peut tre reproduite niutilise sous q