IEC 61603-2-1997 采用红外辐射的音频和/或视频及相关信号的传输第2部分:声宽频带和有关信号用传输系统
时间:2024-05-09 23:49:48 来源: 标准资料网 作者：标准资料网 阅读：9973
【英文标准名称】:Transmissionofaudioand/orvideoandrelatedsignalsusinginfra-redradiation-Part2:Transmissionsystemsforaudiowidebandandrelatedsignals
【原文标准名称】:采用红外辐射的音频和/或视频及相关信号的传输第2部分:声宽频带和有关信号用传输系统
【标准号】:IEC61603-2-1997
【标准状态】:现行
【国别】:国际
【发布日期】:1997-03
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/TC100
【标准类型】:()
【标准水平】:()
【中文主题词】:视频信号;信号传输;传输系统;红外线辐射;电信;定义;电气工程;宽频带传输;声信号
【英文主题词】:Acousticsignals;Acoustics;Audiosignals;Audiovisualmaterials;Compatibility;Controlsignals;Datatransfer;Definitions;Electricalengineering;Electroacoustics;Electromagnetic;Electromagneticcompatibility;Electromagnetism;EMC;Environment;Environmentalcondition;Headphones;Infra-red;Infraredradiation;Marking;Operation;Performanceinservice;Picturetransmissions;Ratings;Signaltransmission;Signals;Soundtransmission;Speechtransmission;Speechtransmissionsystems;Systems;Telecommunication;Transmission;Transmissionsystems;Videosignals;Widebandtransmission
【摘要】:GivesmethodsformeasuringandspecifyingthosecharacteristicsofwidebandaudioIRtransmissionsystems.Appliestosystemswhichmakedifferenteconomicuseoftheavailablebandwidthtobedescribedinorderthatconclusionsregardinginterference
【中国标准分类号】:M74
【国际标准分类号】:33_160_99
【页数】:35P.;A4
【正文语种】:英语
【英文标准名称】:Aerospaceseries-Elementsofelectricalandopticalconnection;Testmethods-Part513:Magneticpermeability;GermanandEnglishversionEN2591-513:2002
【原文标准名称】:航空航天系列.光电连接元件.试验方法.第513部分:导磁性
【标准号】:DINEN2591-513-2003
【标准状态】:现行
【国别】:德国
【发布日期】:2003-05
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:磁性能;规范(验收);渗透性测量;电气元件;电插头;磁的;航天运输;磁导率;电连接器;试验;飞行器;紧固件;航空航天运输;光波导;多语种的;设备;试验条件;渗透率;航空运输;电力设备;飞行器部件
【英文主题词】:
【摘要】:Thedocumentspecifiesamethodofverifyingthattherelativemagneticpermeabilityofatestitemisbelowaspecifiedvalue.Themethodissuitableforlowpermeabilityvalues,i.e.relativemagneticpermeabilityof2,5orless.ItshallbeusedtogetherwithEN2591-100.
【中国标准分类号】:V25
【国际标准分类号】:49_060
【页数】:7P;A4
【正文语种】:德语
【英文标准名称】:StandardPracticesforProductionandPreparationofPowderMetallurgy(PM)TestSpecimens
【原文标准名称】:粉末冶金测试样品制备标准惯例
【标准号】:ASTMB925-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:B09.02
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:compactingtoolset;die;metalpowderproperties;PMmaterials;powdermetallurgytooling;powdertesting;sinteredmaterialproperties;testspecimens;Metallographicpreparation;Powdermetallurgy(P/M)materials
【摘要】:TestspecimensareusedtodeterminetheengineeringpropertiesofPMmaterials,forexample,tensilestrength,ductility,impactenergy,etc.;propertydatathatareessentialtothesuccessfuluseofPMmaterialstandards.ProcessingPMtestspecimensunderproductionconditionsisthemostefficientmethodbywhichtoobtainreliablePMmaterialpropertydatasinceinmostcasesitisimpracticalorimpossibletocuttestbarsfromsinteredparts.Theperformancecharacteristicsofmetalpowders,forexample,compressibility,greenstrengthanddimensionalchangesassociatedwithprocessingareevaluatedusingPMtestspecimensundercontrolledconditions.ThedataobtainedareimportanttobothmetalpowderproducersandPMpartsmanufacturers.PMtestspecimensplayasignificantroleinindustrialqualityassuranceprograms.Theyareusedtocomparepropertiesofanewlotofmetalpowderwithanestablishedlotinanacceptancetestandareusedinthepartmanufacturingprocesstoestablishandadjustproductionvariables.InthoseinstanceswhereitisrequiredtopresentequivalentpropertydataforaproductionlotofPMparts,standardtestspecimenscompactedfromtheproductionpowdermixtothesamegreendensitycanbeprocessedwiththeproductionPMpartsandthentestedtoobtainthisinformation.MaterialpropertytestingperformedforindustrialoracademicresearchanddevelopmentprojectsusesstandardPMtestspecimenssothetestresultsobtainedcanbecomparedwithpreviousworkorpublisheddata.Powdermetallurgytestspecimensmayhavemultipleuses.Thedimensionsandtolerancesgiveninthisstandardarenominalinmanycases.Theuseriscautionedtomakecertainthatthedimensionsofthetestspecimenareinagreementwiththerequirementsofthespecifictestmethodtobeused.1.1ThesestandardpracticescoverthespecificationsforthoseuniaxiallycompactedtestspecimensthatareusedinASTMstandards,theproceduresforproducingandpreparingthesetestspecimens,andreferencetheapplicablestandards.1.2Basictooldesignandengineeringinformationregardingthetoolingthatisrequiredtocompactthetestspecimensandmachiningblanksarecontainedintheannexes.1.3Thisstandardisintendedtobeacomprehensiveone-sourcedocumentthatcanbereferencedbyASTMtestmethodsthatutilizePMtestspecimensandinASTMPMmaterialspecificationsthatcontaintheengineeringdataobtainedfromthesetestspecimens.1.4Thesepracticesarenotapplicabletometalpowdertestspecimensthatareproducedbyotherprocessessuchascoldisostaticpressing(CIP),hotisostaticpressing(HIP),powderforging(PF)ormetalinjectionmolding(MIM).Theydonotpertaintocementedcarbidematerials.1.5DetailedinformationonPMpresses,compactingtoolingandsinteringfurnaces,theirdesign,manufactureandusearenotwithinthescopeofthesepractices.1.6Testspecimenanddiecavitydimensionsshownininch-poundunitsaretoberegardedasstandardandareapplicabletothereferencedASTMtestmethodsandmaterialspecifications.ValuesinSIunitsareshowninparenthesesandresultfromconversioninaccordancewithIEEE/ASTMStandardSI10.Theymaybeapproximateandareonlyforinformation.1.7Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H16
【国际标准分类号】:77_160
【页数】:15P.;A4
【正文语种】:英语