基本信息
| 标准名称： | 噪声发生器测试方法 |
| 英文名称： | Test methods for noise generator |
| 中标分类： |
电子元器件与信息技术 >>
电子测量与仪器 >>
电子测量与仪器综合 |
| ICS分类： |
|
| 发布部门： | 国家技术监督局 |
| 发布日期： | 1990-03-02 |
| 实施日期： | 1990-10-01 |
| 首发日期： | 1990-03-27 |
| 作废日期： | 1900-01-01 |
| 主管部门： | 信息产业部（电子） |
| 归口单位： | 全国电子测量仪器标准化技术委员会 |
| 起草单位： | 国营大华无线电仪器厂 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 1990-10-01 |
| 页数： | 5页 |
| 书号： | 155066.1-7749 |
适用范围
本标准规定了对噪声发生器外观、基本安全、功能正常性的检验和检查方法，对主要性能特性的测试做了具体规定。本标准适用于高频、微波频率范围的噪声发生器。
前言
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目录
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引用标准
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所属分类： 电子元器件与信息技术 电子测量与仪器 电子测量与仪器综合
【英文标准名称】:StandardGuideforMixedFlowingGas(MFG)TestsforElectricalContacts
【原文标准名称】:电触点的混流气体试验用标准指南
【标准号】:ASTMB845-1997(2008)e1
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【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】:B02.11
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:acceleratedtest;airvelocity;atmosphericcorrosion;chlorine;connector;corrosion;corrosivegastesting;electricalcontacts;environmental;humidity;hydrogensulfide;mixedflowinggas;nitrogendioxide;pollutant;reliability;sulfur;sulfurdioxi
【摘要】:Preservationofaconductingsurfaceonelectricalcontactisvitaltothecontinuedfunctioningofsuchcontacts.Contaminationofthesurfacewithinsulatinglayersformedbycorrosionprocessesisonepotentialhazard.LaboratorytestingofcontactsinMFGtestsisusedtoassesstheeffectivenessofdesignfeaturesandmaterials.MFGtestsareusedindevelopmentstudiesofprocessesandmaterialsforcontacts.Forexample,couponspecimensmaybeexposedtoMFGteststoevaluatenewcontactmaterials,layersofnewcoatingmaterialsonasupportingsubstrate,reducedcoatingthicknesses,orprotectivesurfacetreatments.MFGtestsarealsoemployedtotestthedurabilityofafinishedproductwithrespecttoatmosphericcorrosion.Forexample,finishedconnectorsmaybeexposedtoaMFGtestandtheirperformancescomparedagainsteachotheroragainstasetoffixedrequirements.Relaysorswitchcontactsmaybeexposedintheoperatedandnon-operatedconditionstocompareperformance.MFGtestsareusefulfordeterminingtheeffectivenessofconnectorhousingsandshroudsasbarrierstoingressofatmosphericcorrodantstothecontactsurfaces.Thesetestscanalsobeusedtoassessthescreeningofthemetal-to-metalcontactareasofmatedconnectors.MFGtestsareemployedasqualificationteststodetermineconnectorfailureratesinapplicationenvironmentsforwhichcorrelationbetweentestandapplicationhaspreviouslybeenestablished.ThisguideprovidestestconditionswhicharetobeappliedinconjunctionwithPracticeB827whichdefinestherequiredtestoperationandcertificationprocedures,tolerances,andreportingrequirements.WherethetestspecifierrequirescertificationsortolerancesdifferentthanthoseprovidedinPracticeB827,therequiredcertificationsortolerancesshallbepartofthetestspecification.DifferencesfromthespecificationsinPracticeB827shallbereportedinthetestreportprovidedbythetestoperatortothetestspecifier.Specificationofoneofthetestconditionsdefinedinthisdocumentintheformofastatementsuchas,x201C;PartsshallbetestedinaccordancewithASTMB845MethodZ.x201D;,implicitlyrequirestestcondition,Z,appliedaccordingtoPracticeB827.1.1Thetechniquesdescribedinthisguidepertaintomixedflowinggas(MFG)testscontainingspeciesthatareappliedtoevaluatedevicescontainingelectricalcontactssuchassliprings,separableconnectors,electromechanicalrelaysorswitchcontacts.Thesetechniquesmayberelevanttootherdevices,butitistheresponsibilityoftheusertodeterminesuitabilitypriortotesting.1.2TheMFGtestsdescribedinthisguidearedesignedtoacceleratecorrosivedegradationprocesses.Theseaccelerationsaredesignedsuchthatthedegradationoccursinamuchshortertimeperiodthanthatexpectedforsuchprocessesintheintendedapplicationenvironmentofthedevicebeingtested.Applicationenvironmentscanvarycontinuouslyfrombenigntoaggressivelycorrosive.Connectorsandcontactswithinclosedelectroniccabinetsmaybeaffectedbyanenvironmentofdifferentseveritythantheenvironmentontheoutsideofsuchcabinets.Ingeneral,indoorenvironmentsaredifferentthanoutdoorenvironments.TheMFGtestsdescribedherein,beingdiscreteembodimentsofspecificcorrosiveconditions,cannotberepresentativeofallpossibleapplicationenvironments.Itistheresponsibilityofthetestspecifiertoassurethepertinenceofagiventestconditiontothespecifier''sapplicationcondition.1.3TheMFGtestsdescribedhereinarenotd......
【中国标准分类号】:K14
【国际标准分类号】:29_120_20
【页数】:11P.;A4
【正文语种】:英语