JB/T 3947-1999 电阻点焊电极接头
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来源:标准资料网
基本信息
标准名称: | 电阻点焊电极接头 |
英文名称: | Resistance spot welding electrode adaptors |
中标分类: |
机械 >>
通用加工机械与设备 >>
焊接与切割设备 |
替代情况: | JB 3947-1985 |
发布部门: | 国家机械工业局 |
发布日期: | 1999-08-06 |
实施日期: | 2000-01-01 |
首发日期: | 1900-01-01 |
作废日期: | 1900-01-01 |
提出单位: | 全国电焊机标准化技术委员会 |
归口单位: | 全国电焊机标准化技术委员会 |
起草单位: | 成都电焊机厂 |
起草人: | 沈亦恒 |
出版社: | 机械工业出版社 |
出版日期: | 2000-01-01 |
页数: | 3 页 |
适用范围
本标准规定了电阻点焊电极接头(以下简称电极接头)的尺寸和公差,其锥度应能使电极接头固定在电极握杆上.并使电极帽固定在电极接头上。
本标准适用于一般使用条件下的电阻点焊电极接头。
前言
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引用标准
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所属分类: 机械 通用加工机械与设备 焊接与切割设备
【英文标准名称】:StandardPracticeforEvaluatingTestSensitivityforRubberTestMethods
【原文标准名称】:评价橡胶试验方法的试验敏感性的标准操作规程
【标准号】:ASTMD6600-2000(2004)
【标准状态】:现行
【国别】:
【发布日期】:2000
【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】:D11.16
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:absolutetestsensitivity;calibrationmaterial;referencematerial;relativetestsensitivity;signal-to-noiseratio;testsensitivity
【摘要】:Testingisconductedtomaketechnicaldecisionsonmaterials,processes,andproducts.Withthecontinuedgrowthintheavailabletestmethodsforevaluatingscientificandtechnicalproperties,aquantitativeapproachisneededtoselecttestmethodsthathavehigh(orhighest)qualityortechnicalmerit.Theproceduresasdefinedinthispracticemaybeusedforthispurposetomaketestingascosteffectiveaspossible.Oneindexoftestmethodtechnicalmeritandimpliedsensitivityfrequentlyusedinthepasthasbeentestmethodprecision.Theprecisionisusuallyexpressedassomemultipleofthetestmeasurementstandarddeviationforadefinedtestingdomain.Althoughprecisionisarequiredquantityfortestsensitivity,itisanincompletecharacteristic(onlyonehalfofthenecessaryinformation)sinceitdoesnotconsiderthediscriminationpowerfortheFP(orconstituent)beingevaluated.Anyattempttoevaluaterelativetestsensitivityfortwodifferenttestmethodsonthebasisoftestmeasurementstandarddeviationratiosorvarianceratios,whichlackanydiscriminationpowerinformationcontent,constitutesaninvalidquantitativebasisforsensitivity,ortechnicalmeritevaluation.Coefficientofvariationratios(whicharenormalizedtothemean)mayconstituteavalidtestsensitivityevaluationonlyunderthespecialconditionwherethetwotestmethodsundercomparisonaredirectlyproportionalorreciprocallyrelatedtoeachother.Iftherelationshipbetweentwotestmethodsisnonlinearorlinearwithanonzerointercept,thecoefficientofvariationratiosarenotequivalenttothetruetestsensitivityasdefinedinthispractice.SeediscussionofexampleinX1.1.4.Thefigureofmeritdefinedbytestsensitivityanditsvariousclassifications,categories,andtypesasintroducedbythispracticepermitsanauthenticquantitativetestsensitivityevaluation.1.1Thispracticecoverstestingtoevaluatechemicalconstituents,chemicalandphysicalpropertiesofcompoundingmaterials,andcompoundedandcuredrubbers,whichmayfrequentlybeconductedbyoneormoretestmethods.Whenmorethanonetestmethodisavailable,twoquestionsarise:Whichtestmethodhasthebetter(orbest)responsetoordiscriminationfortheunderlyingfundamentalpropertybeingevaluated?andWhichtestmethodhastheleasterror?Thesetwocharacteristicscollectivelydetermineonetypeoftechnicalmeritoftestmethodsthatmaybedesignatedastestsensitivity.1.2Althoughacomprehensiveanddetailedtreatment,asgivenbythispractice,isrequiredforafullappreciationoftestsensitivity,asimplifiedconceptualdefinitionmaybegivenhere.Testsensitivityistheratioofdiscriminationpowerforthefundamentalpropertyevaluatedtothemeasurementerrororuncertainty,expressedasastandarddeviation.Thegreaterthediscriminatingpowerandthelowerthetesterror,thebetteristhetestsensitivity.Borrowingfromtheterminologyinelectronics,thisratiohasfrequentlybeencalledthesignal-to-noiseratio;thesignalcorrespondingtothediscriminationpowerandthenoisecorrespondingtothetestmeasurementerror.Therefore,thispracticedescribeshowtestsensitivity,genericallydefinedasthesignal-to-noiseratio,maybeevaluatedfortestmethodsusedintherubbermanufacturingindustry,whichmeasuretypicalphysicalandchemicalproperties,withexceptionsasnotedin.1.3Thispracticedoesnotaddressthetopicofsensitivityforthresholdlimitsorminimumdetectionlimits(MDL)insuchapplicationsas(1)theeffectofintentionalvariationsofcompoundingmaterialsonmeasuredcompoundpropertiesor(2)theevaluationoflowortraceconstituentlevels.Minimumdetectionlimitsarethesubjectofseparatestandards.Thisstandarddoesnotpurportto......
【中国标准分类号】:G34
【国际标准分类号】:83_040_01
【页数】:16P.;A4
【正文语种】:
基本信息
标准名称: | SDH数字传输分析仪检定规程 |
发布部门: | 邮电部 |
发布日期: | 1998-04-09 |
实施日期: | 1998-05-01 |
首发日期: | |
作废日期: | |
归口单位: | 邮电部通信计量中心 |
起草单位: | 邮电部通信计量中心 |
起草人: | 朱捷 |
出版日期: | |
页数: | 61页 |
适用范围
本标准适用于符合ITU-T有关SDH测量有关的建议及国内相关标准的SDH传输分析仪的仪表验收和常规检定。
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 信息处理技术 数据信息 信息技术 办公机械设备 信息技术用语言