【英文标准名称】:Low-voltageswitchgearandcontrolgear-Part4-2:Contactorsandmotor-starters-ACsemiconductormotorcontrollersandstarters
【原文标准名称】:低压开关装置和控制装置.第4-2部分:接触器和电动机起动器.交流电(AC)半导体电动机控制器和起动器
【标准号】:IEC60947-4-2Corrigendum1-2012
【标准状态】:现行
【国别】:国际
【发布日期】:2012-07
【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/SC17B
【标准类型】:()
【标准水平】:()
【中文主题词】:交流电流;断路器;接触器;电动机接触器(开关);控制装置;控制器;电气工程;感应电动机;检验;低电压;低压设备;低压开关设备;电动机起动器;半导体连接器;半导体器件;半导体工程;半导体;短路保护;固体闸流管;起动器;开关装置;试验
【英文主题词】:Alternatingcurrent;Circuit-breakers;Contactors;Contactorsformotors;Controldevices;Controllers;Electricalengineering;Inductionmotors;Inspection;Lowvoltage;Low-voltageequipment;Low-voltageswitchgear;Motorstarters;Semiconductorcontactors;Semiconductordevices;Semiconductorengineering;Semiconductors;Short-circuitprotection;Solid-statethyratrons;Starters;Switchgear;Testing
【摘要】:
【中国标准分类号】:K30
【国际标准分类号】:29_130_20
【页数】:2P;A4
【正文语种】:英语


【英文标准名称】:StandardPracticeforFabricatingandCheckingAluminumAlloyUltrasonicStandardReferenceBlocks
【原文标准名称】:标准铝合金块的制造及超声波检验的标准操作规程
【标准号】:ASTME127-2007
【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】:E07.06
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:合金;铝合金;比较;金属;无损检验;生产;测试;超声检验;超声波学
【英文主题词】:aluminumreferenceblocks;area-amplitudecalibrationblocks;distance-amplitudecalibrationblocks;nondestructivetesting;standardreferenceblocks;ultrasonicreferenceblocks;Aluminumalloyultrasonicreferenceblocks;Aluminumultrasonicreferenceblocks;Area-amplitudecalibrationblocks;Distance-amplitudecalibrationblocks;Nondestructiveevaluation(NDE);Referenceblocks;Ultrasonicreferenceblocks
【摘要】:Referenceblocksfabricatedtothispracticewillexhibitspecificarea-amplitudeanddistance-amplituderelationshipsonlywithanimmersiontestat5MHzusingthesearchunit,testinstrument,andtestparametersdescribedinthispractice.Comparisontestsatotherfrequenciesorwithuncalibratedtestsystemswillnotnecessarilygivethesamerelationshipsshowninthispractice.Note28212;The1964andpriorissuesofthispracticerequiredatestfrequencyof15MHz.Blocksconformingtoearlierissuesofthispracticemaynotproduceultrasonicresponsesthatconformtothisissue.SeeSection13regardingprovisionforrecertificationorcorrectioncurvesandtables.Althoughtheprimaryultrasonicevaluationofblocksisperformedataspecifiedfrequency,theblocksmaybeusedtostandardizeultrasonictestsatanyfrequencyandwithanypulse-echoultrasonictestsystem.Establishmentofdistance-amplitudeandarea-amplitudecharacteristicsisnecessaryforeachapplication.Thisusemaybeinappropriateforothermaterialsandcurvedsurfaceswithoutspecialcompensation.Alsosee(3)forcautionsregardinguseofstandardblocksforteststandardization.1.1Thispracticecoversaprocedureforfabricatingaluminumalloyultrasonicstandardreferenceblocksthatcanbeusedforcheckingperformanceofultrasonictestingequipmentandforstandardizationandcontrolofultrasonictestsofaluminumalloyproductsusingpulsedlongitudinalwavesintroducedintotestmaterialeitherbythedirect-contactmethodorbytheimmersionmethod.Arecommendedprocedureforcheckingblocksisdescribedandcalibrationdataforanumberofreferenceblocksaretabulated.Statementsconcerningproceduresareprovidedwithoutadiscussionofthetechnicalbackgroundforthepreference.ThenecessarytechnicalbackgroundcanbefoundinRefs.(1-16).Note18212;PracticeE428andGuideE1158alsodescribeproceduresforselectingmaterial,fabricatingblocks,andcheckingresponse.Unlikethispractice,thereisnorequirementforevaluationrelativetoaspecifiedstandardtarget.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:
【国际标准分类号】:77_040_01;77_120_10
【页数】:15P.;A4
【正文语种】: