EN 60268-4-2004 声系统设备.第4部分:传声器

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【英文标准名称】:Soundsystemequipment-Part4:Microphones(IEC60268-4:2004);GermanversionEN60268-4:2004
【原文标准名称】:声系统设备.第4部分:传声器
【标准号】:EN60268-4-2004
【标准状态】:现行
【国别】:
【发布日期】:2004-07
【实施或试行日期】:2004-07-01
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:分类;测量技术;参考弧线;特性;测量;电气设备;天然噪音压力;参考釜;作标记;使用条件;环境条件;参数;声压级;阻抗;传输装置;声压;传声器;频率响应;频率曲线;传输系统;畸变系数;影响量;波幅;对称;传输系数;动力学;电声学;试验;非线性;噪声;电声器件;电气工程;电压测量;声传输
【英文主题词】:Acoustoelectricdevices;Amplitude;Classification;Distortionfactors;Dynamics;Electricalengineering;Electricalequipment;Electroacoustics;Environmentalcondition;Frequencycurve;Frequencyresponse;Impedance;Influencequantity;Marking;Measurement;Measuringtechniques;Microphones;Naturalnoisevoltage;Noise;Non-linearity;Operatingconditions;Parameters;Properties;Referenceaxes;Referencecurve;Soundpressure;Soundpressurelevel;Soundtransmission;Symmetry;Testing;Transfercoefficient;Transmissiondevices;Transmissionsystems;Voltagemeasuring
【摘要】:
【中国标准分类号】:M72
【国际标准分类号】:33_160_50
【页数】:49P.;A4
【正文语种】:英语


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Product Code:SAE AMS4332
Title:Aluminum Alloy, Extruded Profiles (73490t76511) 8.1zn 1.7cu 2.2mg 0.16zr Solution Heat Treated, Stress Relieved, and Overaged
Issuing Committee:Ams D Nonferrous Alloys Committee
Scope:This specification covers an aluminum alloy procured in the form of extruded profiles (shapes) with cross-sections up to 0.750 inch (19.05 mm).【英文标准名称】:StandardTestMethodforConductingPotentiodynamicPolarizationResistanceMeasurements
【原文标准名称】:动电势极化电阻测量的标准试验方法
【标准号】:ASTMG59-1997(2009)
【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】:G01.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:anodicpolarization;auxiliaryelectrode;cathodicpolarization;corrosion;corrosionpotential;corrosionrate;currentdensity;electrochemicalcell;electrochemicalpotential;Lugginprobe;mixedpotential;open-circuitpotential;overvoltage;polariza
【摘要】:Thistestmethodcanbeutilizedtoverifytheperformanceofpolarizationresistancemeasurementequipmentincludingreferenceelectrodes,electrochemicalcells,potentiostats,scangenerators,measuringandrecordingdevices.Thetestmethodisalsousefulfortrainingoperatorsinsamplepreparationandexperimentaltechniquesforpolarizationresistancemeasurements.Polarizationresistancecanberelatedtotherateofgeneralcorrosionformetalsatorneartheircorrosionpotential,Ecorr.Polarizationresistancemeasurementsareanaccurateandrapidwaytomeasurethegeneralcorrosionrate.Realtimecorrosionmonitoringisacommonapplication.Thetechniquecanalsobeusedasawaytorankalloys,inhibitors,andsoforthinorderofresistancetogeneralcorrosion.Inthistestmethod,asmallpotentialscan,x0394;E(t),definedwithrespecttothecorrosionpotential(x0394;E=Ex2013;Ecorr),isappliedtoametalsample.Theresultantcurrentsarerecorded.Thepolarizationresistance,RP,ofacorrodingelectrodeisdefinedfromEq1astheslopeofapotentialversuscurrentdensityplotati=0(1-4):Thecurrentdensityisgivenbyi.Thecorrosioncurrentdensity,icorr,isrelatedtothepolarizationresistancebytheStern-Gearycoefficient,B.(3),ThedimensionofRpisohm-cm2,icorrismuA/cm2,andBisinV.TheStern-Gearycoefficientisrelatedtotheanodic,ba,andcathodic,bc,TafelslopesasperEq3.TheunitsoftheTafelslopesareV.Thecorrosionrate,CR,inmmperyearcanbedeterminedfromEq4inwhichEWistheequivalentweightofthecorrodingspeciesingramsandx03C1;isthedensityofthecorrodingmaterialing/cm3.RefertoPracticeG102forderivationsoftheaboveequationsandmethodsforestimatingTafelslopes.Thetestmethodmaynotbeappropriatetomeasurepolarizationresistanceonallmaterialsorinallenvironments.See9.2foradiscussionofmethodbiasesarisingfromsolutionresistanceandelectrodecapacitance.1.1Thistestmethodcoversanexperimentalprocedureforpolarizationresistancemeasurementswhichcanbeusedforthecalibrationofequipmentandverificationofexperimentaltechnique.Thetestmethodcanprovidereproduciblecorrosionpotentialsandpotentiodynamicpolarizationresistancemeasurements.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatory......
【中国标准分类号】:A55
【国际标准分类号】:17_220_20
【页数】:4P.;A4
【正文语种】:英语