IEC 60118-3-1983 助听器第3部分:不完全戴在听者身上的助听设备
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【英文标准名称】:Hearingaids.Part3:Hearingaidequipmentnotentirelywornonthelistener
【原文标准名称】:助听器第3部分:不完全戴在听者身上的助听设备
【标准号】:IEC60118-3-1983
【标准状态】:作废
【国别】:国际
【发布日期】:1983
【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/TC29
【标准类型】:()
【标准水平】:()
【中文主题词】:电气工程;试验;测量技术;声学试验;声学;电声学;助听器;电声器件;测量;声试验
【英文主题词】:Acoustictesting;Acoustics;Acoustoelectricdevices;Electricalengineering;Electroacoustics;Hearingaids;Measurement;Measuringtechniques;Testing
【摘要】:Describesamethodofdeterminingtheoverallelectroacousticperformanceofequipment,usedintherehabilitationofpersonshavingimpairedhearing.Themethodsspecifiedgiveinformationonthemeasurementofparameters,suchasfrequencyresponse,ai
【中国标准分类号】:L31
【国际标准分类号】:11_180_15
【页数】:13P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 进出口三氧化二砷化学分析方法 第1部分：三氧化二砷含量的测定 |
| 替代情况： | 替代SN/T 0837.1-1999 |
| 发布部门： | 中华人民共和国国家质量监督检验检疫总局 |
| 发布日期： | 2011-02-25 |
| 实施日期： | 2011-07-01 |
| 首发日期： | |
| 作废日期： | |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2011-07-01 |
适用范围
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前言
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目录
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引用标准
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所属分类： 建材 建筑构配件与设备 建筑构配件与设备综合 建筑材料和建筑物 建筑构件 门窗
【英文标准名称】:StandardPracticeforClassificationofComputedRadiologySystems
【原文标准名称】:计算机辐射系统分类的标准实施规程
【标准号】:ASTME2446-2005(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:2005
【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】:E07.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:basicspatialresolution.;classification;computedradiology;CR;filmsystemclassification;normalizedSNR;photo-stimulatedluminescence;PSL;Imagequality;Computedradiologysystems;Industrialradiographicfilmprocessing/testing;Phosphor
【摘要】:ThereareseveralfactorsaffectingthequalityofaCRimageincludingthespatialresolutionoftheIPsystem,geometricalunsharpness,scatterandcontrastsensitivity(signal-to-noiseratio),aswellassoftware.Thereareseveraladditionalfactors(forexample,scanningparameters),whichaffecttheaccuratereadingofimagesonexposedIPsusinganopticalscanner.ThispracticeistobeusedtoestablishaclassificationofCRsystemclassesonthebasisofanormalizedSNR.Duetothedifferencebetweenthemethods,itisrequiredtospecifytheCRsystemclasseswithspatialresolutionvalues.TheCRsystemclassesinthisdocumentdonotrefertoanyparticularmanufacturersx2019;imagingplates.ACRsystemclassresultsfromtheuseofaparticularimagingplatetogetherwiththeexposureconditions,particularlytotalexposure,thescannertypeandsoftwareandthescanningparameters.ThisclassificationsystemprovidesameanstocomparedifferingCRtechnologies,asiscommonpracticewithfilmsystems,whichguidestheusertotheappropriateconfiguration,IPandtechniquefortheapplicationathand.Theclassselectedmaynotmatchtheimagingperformanceofacorrespondingfilmclassduetothedifferenceinthespatialresolutionandscattersensitivity.Therefore,thepracticeshouldalwaysuseIQIsforproofofcontrastsensitivityandspatialresolution.Thequalityfactorscanbedeterminedmostaccuratelybythetestsdescribedinthispractice.Someofthesystemtestsrequirespecialtools,whichmaynotbeavailableinuserlaboratories.SimplertestsaredescribedforqualityassuranceinPracticeE2445,whicharedesignedforafasttestofthequalityofCRsystemsandlong-termstabilityandarerecommendedaspracticalusertests,shouldtheusernothavethespecialtoolsavailableasneededforthetestsinthispractice.ManufacturersofindustrialCRsystemswillusethispractice.UsersofindustrialCRsystemsmayalsoperformthetestsandmeasurementsoutlinedinthispractice,providedthattherequiredtestequipmentisusedandthemethodologyisstrictlyfollowed.AnyalternativemethodsmaybeappliedifequivalencetothemethodsofthispracticeisproventotheappropriateCognizantEngineeringOrganization.ThepublicationofCRsystemclasseswillenablespecifyingbodiesandcontractingpartiestoagreetoparticularsystemclass,asafirststepinarrivingattheappropriatesettingsofasystem,ortheselectionofasystem.ConfirmationofnecessaryimagequalityshallbeachievedbyusingPracticeE2033.1.1Thispracticedescribestheevaluationandclassificationofacomputedradiography(CR)system,aparticularphosphorimagingplate(IP),systemscannerandsoftware,incombinationwithspecifiedmetalscreensforindustrialradiography.Itisintendedtoensurethattheevaluationofimagequality,asfarasthisisinfluencedbythescanner/IPsystem,meetstheneedsofusers.1.2Thepracticedefinessystemteststobeusedtoclassifythesystemsofdifferentsuppliersandmakethemcomparableforusers.1.3TheCRsystemperformanceisdescribedbysignalandnoiseparameters.Forfilmsystems,thesignalisrepresentedbygradientandthenoisebygranularity.Thesignal-to-noiseratioisnormalizedbythebasicspatialresolutionofthesystemandispartofclassification.Thenormalizationisgivenbythescanningapertureof100x00B5;mdiameterforthemicro-photometer,whichisdefinedinTestMethodE1815forfilmsystem......
【中国标准分类号】:F80
【国际标准分类号】:19_100
【页数】:10P.;A4
【正文语种】:英语
