MIL-F-8905B
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来源:标准资料网
MIL-F-8905B, MILITARY SPECIFICATION, FITTINGS AND CARGO RINGS, AIRCRAFT FLOOR (1 DEC 1967) [S/S by SAE-AS8905]., This specification establishes requirements for two types of aircraft floor fittings for tiedown of cargo and seats, and two types of cargo tiedown rings.
【英文标准名称】:Electroacoustics-Soundlevelmeters-Specifications
【原文标准名称】:电声学.声级计.规范
【标准号】:BSEN61672-1-2003
【标准状态】:现行
【国别】:英国
【发布日期】:2003-03-25
【实施或试行日期】:2003-03-25
【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】:定义;电声学;噪声控制;声级;规范(验收);电气工程;规范;测量;职业安全;污染控制;作标记;特性;声级计;声学;测量仪器;声学测量;频率;声学性质和声学现象;误差极限;噪声测量;特点;频率测量;试验;噪声(环境的);声学试验;电气试验;精密度;电性质和电现象;声压级
【英文主题词】:Acousticmeasurement;Acousticpropertiesandphenomena;Acoustictesting;Acoustics;Definition;Definitions;Electricalengineering;Electricalproperties;Electricalpropertiesandphenomena;Electricaltesting;Electroacoustics;Errorlimits;Features;Frequencies;Frequencymeasurement;Marking;Measurement;Measuringinstruments;Noisecontrol(acoustic);Noise(environmental);Noisemeasurements;Occupationalsafety;Pollutioncontrol;Precision;Properties;Soundexposure;Soundlevels;Soundpressurelevel;Sound-levelmeters;Specification;Specification(approval);Testing
【摘要】:1Thisstandardgiveselectroacousticalperformancespecificationsforthreekindsofsoundmeasuringinstruments:-aconventionalsoundlevelmeterthatmeasuresexponentialtime-weightedsoundlevel;-anintegrating-averagingsoundlevelmeterthatmeasurestime-averagesoundlevel;and-anintegratingsoundlevelmeterthatmeasuressoundexposurelevel.Asingleinstrumentmaymakeany,orall,ofthethreekindsofmeasurements.Additionalperformancespecificationsaregivenforthemeasurementofmaximumtime-weightedsoundlevelandpeakCsoundlevel.Frequency-weightingAismandatoryforallsoundlevelmetersspecifiedinthisstandard.2Soundlevelmetersconformingtotherequirementsofthisstandardhaveaspecifiedfrequencyresponseforsoundincidentonthemicrophonefromoneprincipaldirectioninanacousticfreefieldorfromrandomdirections.3Soundlevelmetersspecifiedinthisstandardareintendedtomeasuresoundsgenerallyintherangeofhumanhearing.NOTEFormeasurementofaudiblesoundinthepresenceofultrasound,theAUweighting,specifiedinIEC61012[1],maybeapplied.4Twoperformancecategories,class1andclass2,arespecifiedinthisstandard.Ingeneral,specificationsforclass1andclass2soundlevelmetershavethesamedesigngoalsanddiffermainlyinthetolerancelimitsandtherangeofoperationaltemperatures.Tolerancelimitsforclass2specificationsaregreaterthan,orequalto,thoseforclass1specifications.5Thisstandardisapplicabletoarangeofdesignsforsoundlevelmeters.Asoundlevelmetermaybeaself-containedhand-heldinstrumentwithanattachedmicrophoneandabuilt-indisplaydevice.Asoundlevelmetermaybecomprisedofseparatecomponentsinoneormoreenclosuresandmaybecapableofdisplayingavarietyofacousticalsignallevels.Soundlevelmetersmayincludeextensiveanalogueordigitalsignalprocessing,separatelyorincombination,withmultipleanalogueanddigitaloutputs.Soundlevelmetersmayincludegeneral-purposecomputers,recorders,printers,andotherdevicesthatformanecessarypartofthecompleteinstrument.note:1Numbersinsquarebracketsrefertothebibliography.6Soundlevelmetersmaybedesignedforusewithanoperatorpresentorforautomaticandcontinuousmeasurementsofsoundlevelwithoutanoperatorpresent.Specificationsinthisstandardfortheresponsetosoundwavesapplywithoutanoperatorpresentinthesoundfield.
【中国标准分类号】:L31
【国际标准分类号】:17_140_50
【页数】:46P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 可换测量块 |
| 中标分类： |
航空、航天 >>
航空器与航天器制造用设备 >>
量具 |
| 发布日期： | 1988-04-09 |
| 实施日期： | 1988-05-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 1页 |
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： 航空 航天 航空器与航天器制造用设备 量具
