SAE J284 Safety Alert Symbol for Agricultural, Construction, and Industrial Equipment
作者:标准资料网 时间:2024-05-21 13:35:21 浏览:8561
来源:标准资料网
Product Code:SAE J284
Title:Safety Alert Symbol for Agricultural, Construction, and Industrial Equipment
Issuing Committee:Hftc2, Machine Displays And Symbols
Scope:This SAE Recommended Practice presents the general uses, limitations on use, and appearance of the safety alert symbol.
【英文标准名称】:Informationprocessing;Generalpurposereelswith8mm(5/16in)centreholeformagnetictapeforinterchangeinstrumentationapplications
【原文标准名称】:信息处理互换计测磁带用的8mm(5/16in)中心孔通用带盘
【标准号】:ISO3802-1976
【标准状态】:现行
【国别】:国际
【发布日期】:1976-10
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:信息交流;尺寸;线圈;磁带;规范;信息处理;储存;规范(批准);信息交换;布置;仪表记录;数据处理
【英文主题词】:Dataprocessing;Dimensions;Informationexchange;Informationinterchange;Informationprocessing;Instrumentationrecording;Layout;Magnetictapes;Specification(approval);Specifications;Spools;Storage
【摘要】:Specifiesthedimensionsofgeneral-purposereelswith8mm(5/16in)centreholedesignedforusewithmagnetictapeininterchangeinstrumentationapplication.
【中国标准分类号】:L44
【国际标准分类号】:35_220_22
【页数】:3P.;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforCharacterizingtheEffectofExposuretoEnvironmentalCyclingonThermalPerformanceofInsulationProducts
【原文标准名称】:暴露于环境循环对绝缘产品热性能特征影响的标准试验方法
【标准号】:ASTMC1512-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:C16.33
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:环境测试;曝露;绝缘;污染控制;试验方法;热分析;绝热材料;隔热;热应力
【英文主题词】:environmentalcycling;thermalinsulation
【摘要】:Exposingaspecimentoconditionsofone-directionalenvironmentalcyclingcanincreaseitsmoisturecontentuntiladecreaseinmaterialpropertiesoccurs(ataspecificnumberofcycles).Suchatestcouldbeinappropriateduetothenumberofcyclesrequiredtocauseadecreaseinmaterialpropertiessinceproductperformanceissuesoftenariseonlyaftermanyyearsofexposure.Theuseofapreconditioningprocedureisnotintendedtoduplicateexpectedfieldperformance.Ratherthepurposeistoincreasethemoisturecontentoftestmaterialspriortosubjectingtothemtoenvironmentalcycling.Themostimportantaspectofthepreconditioningprocedureisnon-uniformmoisturedistributioninthespecimen.Theheatflowisonedirectionalcausingmoistureflowtowardsthecoldsideresultinginzonesofdrymaterialonthewarmsideandhighmoisturecontentonthecoldside.(Whetherthehighmoisturecontentzoneislocatedrightatthecoldsurfaceofthespecimenoratsomedistancefromthissurfacedependsupontemperatureoscillationandabilityofthecoldsurfacetodryoutwards).Becausethepreconditioningprocedureinvolvesthermalgradient,thispreconditioningprocedureresultsinadistributionofmoisturecontentthatmayoccurunderfieldexposureconditions.However,theresultingmoisturecontentmaydiffersignificantlyfromthatwhichmaybedemonstratedintypicalproductapplications.Thepreconditioningresultsinaccumulationofmoistureinthethermalinsulationresultingfromthesimultaneousexposuretoadifferenceintemperatureandwatervaporpressure.Thistestmethodisnotintendedtoduplicatefieldexposure.Itisintendedtoprovidecomparativeratings.Asexcessiveaccumulationofmoistureinaconstructionsystemmayadverselyaffectitsperformance,thedesignershouldconsiderthepotentialformoistureaccumulationandthepossibleeffectsofthismoistureonthesystemperformance.1.1Thistestmethodisapplicabletopreformedorfieldmanufacturedthermalinsulationproducts,suchasboardstockfoams,rigidfibrousandcompositematerialsmanufacturedwithorwithoutprotectivefacings.SeeNote0Thistestmethodisnotapplicabletohightemperature,reflectiveorloosefillinsulation.Note0Iftheproductismanufacturedwithafacer,testproductwithfacerinplace.1.2Thistestmethodinvolvestwostages:preconditioningandenvironmentalcycling.Duringthefirststage,25mm(1in.)thickspecimensareusedtoseparatetwoenvironments.Eachoftheseenvironmentshasaconstantbutdifferenttemperatureandhumiditylevel.Duringtheenvironmentalcyclingstage,specimensalsodividetwoenvironmentsnamelyconstantroomtemperature/humidityononesideandcyclingtemperature/ambientrelativehumidityontheotherside.1.3Thistestmethodmeasurestheabilityoftheproducttomaintainthermalperformanceandcriticalphysicalattributesafterbeingsubjectedtostandardizedexposureconditions.Acomparisonismadebetweenmaterialpropertiesforreferencespecimensstoredinthelaboratoryforthetestperiodandspecimenssubjectedtothetwo-stagetestmethod.Toeliminatetheeffectofmoisturefromthecomparison,thematerialpropertiesofthelattertestspecimensaredeterminedaftertheyhavebeendriedtoconstantweight.Theaveragevaluedeterminedforeachofthetwosetsofspecimensisusedforcomparison.1.4Differentpropertiescanbemeasuredtoassesstheeffectofenvironmentalfactorsonthermalinsulation.Thistestmethodrequiresthatthermalresistancebedeterminedbaseduponanaverageforthreespecimensmeasuredaftercompletingthetest.Secondaryelementsofthistestmethodincludevisualobservationssuchascracking,delaminationorothersurfacedefects,aswellasthechangeinmoisturecontentaftereachofthetwostagesofexposur......
【中国标准分类号】:K15
【国际标准分类号】:13_020_60
【页数】:5P.;A4
【正文语种】:
