标准资料网-标准资料免费资源平台

【英文标准名称】:Acoustics-Measurementofairbornenoiseemittedbyinformationtechnologyandtelecommunicationsequipment
【原文标准名称】:声学.信息技术设备和电信设备发出的空气噪声的测量
【标准号】:BSENISO7779-2001
【标准状态】:作废
【国别】:英国
【发布日期】:2001-10-25
【实施或试行日期】:2001-10-25
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:数据处理;声学;数据处理设备;办公室设备;噪声(环境的);通信设备;声学试验;空气噪声;声学测量;计算机
【英文主题词】:Acousticmeasurement;Acoustictesting;Acoustics;Airbornenoise;Airbornenoiseemitted;Airbornesound;Cables;Calibration;Clayfraction;Comparison;Computers;Corrrections;Data;Dataprocessing;Dataprocessingequipment;Definitions;Determination;Envelopingsurfacemethods;Environment;Externalnoise;Filters;Freefields;Frequencies;Handling;Informationtechnology;Inputvoltage;Installations;Instruments;Layout;Loudnesslevels;Machinenoise;Machines;Measurement;Measurementduration;Measuringbanks;Measuringenvironment;Measuringincertainity;Measuringinstruments;Measuringrooms;Measuringsurfaces;Measuringsystems;Methods;Microphones;Moisture;Noise;Noisecontrol;Noiseemissions;Noise(environmental);Noisemeasurements;Officeequipment;Officemachines;Operatingconditions;Operatingstations;Operation;Operators;PC;Personalcomputers;Precision;Pressure;Printers;Reflection;Reverberationroommethod;Reverberationrooms;Rotation;Sitting;Soundintensity;Soundlevel;Soundpressure;Soundpressurelevel;Soundsources;Tables;Telecommunications;Temperature;Terminals;Testing;Typeofunit;Workingplaces
【摘要】:ThisInternationalStandardspecifiesproceduresformeasuringandreportingthenoiseemissionofinformationtechnologyandtelecommunicationsequipment.Thisstandardisconsideredpartofanoisetestcodeforthistypeofequipment,andisbasedonbasicnoiseemissionstandardsISO3741,ISO3744,ISO3745andISO11201.ThebasicemissionquantityistheA-weightedsoundpowerlevelwhichmaybeusedforcomparingequipmentofthesametypebutfromdifferentmanufacturers,orforcomparingdifferentequipment.ThreebasicnoiseemissionstandardsfordeterminingthesoundpowerlevelsarespecifiedinthisInternationalStandardinordertoavoidunduerestrictiononexistingfacilitiesandexperience.Thefirstbasicstandard(ISO3741)specifiescomparisonmeasurementsinareverberationroom;theothertwo(ISO3744andISO3745)specifymeasurementsinanessentiallyfreefieldoverareflectingplane.AnyoneofthesethreebasicnoiseemissionstandardsmaybeselectedandshallthenbeusedexclusivelyaccordingtothisInternationalStandardwhendeterminingsoundpowerlevelsofamachine.TheA-weightedsoundpowerlevelissupplementedbytheA-weightedsoundpressurelevelmeasuredattheoperatorposition(s)orthebystanderpositions,basedonthebasicnoiseemissionstandardISO11201.Thissoundpressurelevelisnotaworker'simmissionratinglevel,butitmayassistinidentifyinganypotentialproblemsthatcouldcauseannoyance,activityinterference,orhearingdamagetooperatorsandbystanders.MethodsfordeterminingwhetherthenoiseemissionincludesprominentdiscretetonesorisimpulsiveincharacterarespecifiedinannexesDandErespectively.ThisInternationalStandardissuitablefortypetestsandprovidesmethodsformanufacturersandtestinglaboratoriestoobtaincomparableresults.ThemethodsspecifiedinthisInternationalStandardallowthedeterminationofnoiseemissionlevelsforaunittestedindividually.Theproceduresmaybeappliedtoequipmentwhichemitsbroad-bandnoise,narrow-bandnoiseandnoisewhichcontainsdiscrete-frequencycomponents,orimpulsivenoise.Thesoundpowerandsoundpressurelevelsobtainedmayservenoiseemissiondeclarationandcomparisonpurposes(seeISO9296).Theyarenottobeconsideredasinstallationnoiseimmissionlevels;howevertheymaybeusedforinstallationplanning(seeECMATR/27).Ifsoundpowerlevelsobtainedaredeterminedforanumberofunitsofthesameproductionseries,theycanbeusedtodetermineastatisticalvalueforthatproductionseries(ISO9296).
【中国标准分类号】:Z32
【国际标准分类号】:17_140_20;35_020
【页数】:76P.;A4
【正文语种】:英语


【英文标准名称】:TestMethodforNoiseQualityofFilm-TypeResistors
【原文标准名称】:膜式电阻器的噪声等级试验方法
【标准号】:ASTMF772-1982(1990)
【标准状态】:作废
【国别】:
【发布日期】:1982
【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】:
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:质量;电阻器;电子工程;试验;噪声
【英文主题词】:
【摘要】:
【中国标准分类号】:L13
【国际标准分类号】:31_040_10
【页数】:
【正文语种】: