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【英文标准名称】:Samplingproceduresforinspectionbyvariables-Sequentialsamplingplansindexedbyacceptancequalitylimit(AQL)forinspectionbyvariables(knownstandarddeviation)
【原文标准名称】:用变量检验抽样程序.变量检验用按接收质量限(AQL)检索的连续抽样计划(知道标准偏差)
【标准号】:BS6002-4-2006
【标准状态】:现行
【国别】:英国
【发布日期】:2006-05-31
【实施或试行日期】:2006-05-31
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:接收质量限;验收抽样;合格质量级值;特性;缺陷;定义;图示;误差;检验;变量检验;抽样特性曲线;参数;质量保证;随机试样;样品试验;抽样方法;抽样表;统计质量控制;统计学;表(数据);测试
【英文主题词】:Acceptablequalitylimits;Acceptancesampling;AQL-value;Characteristics;Defects;Definition;Definitions;Diagrams;Errors;Inspection;Inspectionbyvariables;Operatingcharacteristiccurve;Parameters;Qualityassurance;Randomsamples;Sampletests;Samplingmethods;Samplingtables;Statisticalqualitycontrol;Statistics;Tables(data);Testing
【摘要】:ThispartofISO3951specifiesasystemofsequentialsamplingplans(schemes)forlot-by-lotinspectionbyvariables.Theschemesareindexedintermsofapreferredseriesofacceptancequalitylimit(AQL)values,rangingfrom0,01to10,whicharedefinedintermsofpercentnonconformingitems.TheschemesofISO3951areintendedtoinduceasupplierthroughtheeconomicandpsychologicalpressureoflotnon-acceptancetomaintainaprocessaverageatleastasgoodasthespecifiedAQLvalue,whileatthesametimeprovidinganupperlimitfortherisktotheconsumerofacceptingtheoccasionalpoorlot.Theschemesaredesignedtobeappliedtoacontinuingseriesoflots,thatis,aserieslongenoughtoallowtheswitchingrules(Clause6)tobeapplied.Theseswitchingrulesprovide:-automaticprotectiontotheconsumer(bymeansofaswitchtotightenedinspectionordiscontinuationofsamplinginspection)shouldadeteriorationinqualitybedetected;-anincentive(atthediscretionoftheresponsibleauthority)toreduceinspectioncosts(bymeansofaswitchtoreducedinspection)shouldconsistentlygoodqualitybeachieved.ThispartofISO3951isdesignedforuseunderthefollowingconditions:a)wheretheinspectionprocedureistobeappliedtoacontinuingseriesoflotsofdiscreteproductsallsuppliedbyoneproducerusingoneproductionprocess.Iftherearedifferentproducersorproductionprocesses,applythispartofISO3951toeachoneseparately;b)whereonlyasinglequalitycharacteristic,x,oftheseproductsistakenintoconsideration,whichmustbemeasurableonacontinuousscale;c)wheretheuncertaintyofthemeasurementsystemisnegligiblewithrespecttotheproductionprocessstandarddeviation;d)whereproductionisstable(understatisticalcontrol)andthequalitycharacteristic,x,isdistributedaccordingtoanormaldistribution(oracloseapproximationtothenormaldistribution)oradistributionwhichmaybemathematicallytransformedtoanormaldistribution;e)wherethestandarddeviationofthequalitycharacteristic,x,isknown;f)whereacontractorstandarddefinesanupperspecificationlimit,U,alowerspecificationlimit,L,orboth;anitemisqualifiedasconformingifandonlyifitsmeasuredqualitycharacteristic,x,satisfiestheappropriateoneofthefollowinginequalities:1)xuU(i.e.thesingleupperspecificationlimitisnotviolated);2)xWL(i.e.thesinglelowerspecificationlimitisnotviolated);3)LuxuU(i.e.theupperandlowerdoublespecificationlimitsarenotviolated).InthispartofISO3951,itisassumedthat,wheredoublespecificationlimitsapply,conformancetobothspecificationlimitsiseitherequallyimportanttotheintegrityoftheproductorisconsideredseparatelyforbothspecificationlimits.Inthefirstcase,itisappropriatetoapplyasingleAQLtothecombinedpercentageofproductoutsidethetwospecificationlimits.ThisisreferredtoasacombinedAQLrequirement.Inthesecondcase,separateAQLsapplytononconformitybeyondeachofthelimits,andthisisreferredtoasaseparateAQLrequirement.InthispartofISO3951,theacceptabilityofalotisimplicitlydeterminedfromanestimateofthepercentageofnonconformingitemsintheprocess,basedonarandomsampleofitemsfromthelot.Assuch,itisnotapplicableforjudgingtheacceptabilityofisolatedlotsorshortseriesoflots.RefertoISO2859-2forapplicablesamplingplansinthiscase.
【中国标准分类号】:A41
【国际标准分类号】:03_120_30
【页数】:46P.;A4
【正文语种】:英语