IEC 60268-8-1973 声系统设备第8部分:自动增益控制器件
时间:2024-05-02 05:04:07 来源: 标准资料网 作者：标准资料网 阅读：8583
【英文标准名称】:Soundsystemequipment.Part8:Automaticgaincontroldevices
【原文标准名称】:声系统设备第8部分:自动增益控制器件
【标准号】:IEC60268-8-1973
【标准状态】:现行
【国别】:国际
【发布日期】:1973
【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/TC100
【标准类型】:()
【标准水平】:()
【中文主题词】:试验;电声器件;自动;电气工程;传输系统;传输装置;电变量控制;增益控制;公共寻址系统;电气设备;声传输
【英文主题词】:Acoustoelectricdevices;Automatic;Electricalengineering;Electricalequipment;Electricalvariablescontrol;Gaincontrol;Public-addresssystems;Soundtransmission;Testing;Transmissiondevices;Transmissionsystems
【摘要】:Appliestoautomaticgaincontrolcircuits(AGC-circuits)usedfordifferentpurposesinsoundsystems.Includesdeviceswhichhavelimitingand/orcompressingpropertieswithrespecttotheenvelopeoftheinputsignal.Doesnotincludeexpanders,clipp
【中国标准分类号】:M72
【国际标准分类号】:33_160_10
【页数】:26P.;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforMeasuringFrettingCorrosionofOsteosynthesisPlatesandScrews
【原文标准名称】:测量接骨用板和钉磨蚀的标准试验方法
【标准号】:ASTMF897-2002(2007)
【标准状态】:现行
【国别】:
【发布日期】:2002
【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】:F04.15
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:医疗设备;腐蚀;医学科学;螺钉;试验;板;测量
【英文主题词】:corrosion-surgicalimplants;cracking-stress-corrosion;loadingtests-surgicalmaterials/applications;orthopaedicmedicaldevices-boneplates;orthopaedicmedicaldevices-bonescrews;osteosynthesis;seals;stress-metallicmaterials;testingmethods-surg
【摘要】:Itiswellknownfromexaminationofimplantsafterusethatplatesandscrewsusedforosteosynthesisaresubjectedtometallossduetocorrosionattheplate-screwinterfaces.Oneofthemechanismsofthiscorrosiveattackisfrettingcorrosionduetorelativemotion(micromotion)betweenthescrewheadsandplate-holecountersinks.Itisalsoknownthatreleaseofcorrosionproductsintothetissuessurroundinganimplantmayhaveadverseeffectsonlocaltissueorhavesystemiceffects.Thus,itisimportanttominimizetheamountoftissueexposuretocorrosionproducts.ScrewsandplatesareavailableindifferentconfigurationsinaccordancewithSpecificationsF543andF382.Thistestmethodmaybeusedtoevaluatetheeffectsofdifferentcombinationsofscrewandplatedesigns.Asnewmaterialsanddevicedesignsaredevelopedforuseinthetreatmentoffracturedbones,itisimportanttodeterminetheeffectsthesedevelopmentshaveontheamountofmetallossduetofrettingcorrosion.Thistestmethodprovidesastandardizedscreeningtestforrankingmetalplatesandscrewsintermsofresistancetofrettingcorrosionandfordeterminingtheinfluenceofdifferentsolutionsonfrettingcorrosionrates.Thistestmethodmayalsobeusedtogeneratecorrosionproductseitherforchemicalanalysisoftheproductsorfortestingforbiologicalreactionstocorrosionproductsusinganimalorcellculturemethods.Itiswellknownthatfrettingcorrosionratesdependonnormalloadorpressure,frequency,slidingamplitude,materials,surfacetreatments,andenvironmentalfactors.(4)Therefore,whendeterminingtheeffectofchangingoneoftheseparameters(forexample,materialorenvironment),allothersmustbekeptconstanttofacilitateinterpretationoftheresults.1.1Thistestmethodprovidesascreeningtestfordeterminingtheamountofmetallossfromplatesandscrewsusedforosteosynthesis(internalfixationofbrokenbones)duetofrettingcorrosioninthecontactareabetweenthescrewheadandtheplateholecountersinkarea.Theimplantsareusedintheformtheywouldbeusedclinically.Themachinedescribedgeneratesarelativemotionbetweenplatesandscrewswhichsimulatesonetypeofmotionpatternthatcanoccurwhenthesedevicesareusedclinically.1.2Sincetheenvironmentalandstressconditionsusedinthistestmethodmaynotbeidenticaltothoseexperiencedbyboneplatesinthehumanbody,thistestmethodmayproducefrettingcorrosionratesthatarelowerorhigherthanthoseexperiencedinpractice.Therecommendedaxialloadof400Nwasselectedasbeinginarangewheretheamountoffrettingcorrosionisnotsensitivetosmallchangesinaxialload(1).Thecombinationoftherecommendedloadandangulardisplacementaresuchthatameasurableamountoffrettingcorrosionofsurgicalalloysoccursinacomparativelyshortperiodoftime(7to14days).(Refs1-3)1.3Thedeviceisdesignedsoastofacilitatesterilizationofthetestspecimensandtestchamberstopermittestingwithproteinaceoussolutionsthatwouldbecomecontaminatedwithmicrobialgrowthinnonsterileconditions.1.4Thespecimensusedcanbestandardosteosynthesisimplantsorcanbematerialsfabricatedintotheappropriateshapes.1.5Thistestmethodmaybeusedfortestingthefrettingcorrosionofmetalplatesandscrewsofsimilarordifferentalloycompositions,oritmaybeusedfortestingthefrettingcorrosionofmetal-nonmetalcombinations.Thistestmethodmayalsobeusedforwearordegradationstudiesofnonmetallicmaterials.Thistestmethodmaybeusedasascreeningtesttorankthecorrosivitiesofsalineorproteinace......
【中国标准分类号】:C35
【国际标准分类号】:11_040_40
【页数】:5P.;A4
【正文语种】:
Product Code:SAE ARD50020
Title:Fiber-Optic Interconnection Hardware for Aerospace Applications (Cancelled Jun 2003)
Issuing Committee:As-3 Fiber Optics And Applied Photonics Committee
Scope: This ARD is intended to broadly cover all aspects of the fiber-optic interconnection system needed for diverse applications within the aerospace industry. At present, it is primarily at statement of the problem areas that have surfaced within this industry. The eventual objective is to reach a consensus on issues of industry requirements and architectural concepts that may further the preparation of standards and specifications for interconnection components that can service the unique needs of aerospace applications. This information shall be considered nonpertinent one year following publication unless revised and reissues by SAE AS-3.