【英文标准名称】:TDMAThirdGenerationWireless-IntroductiontoTeleservices
【原文标准名称】:时分多址联接第三代无线电通信.有关电信业务的说明
【标准号】:ANSI/TIA-136-700-D-2002
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:时分多址联接;远程通信;电信;无线通信业务
【英文主题词】:TDMA;Telecommunication;Telecommunications;Wirelesscommunicationservices
【摘要】:TheteleserviceisamechanismforinformationdeliveryfromasourcetoadestinationthroughaBMI.
【中国标准分类号】:M36
【国际标准分类号】:33_070_50
【页数】:
【正文语种】:英语


【英文标准名称】:StandardPracticeforMonitoringtheCalibrationofUltraviolet-VisibleSpectrophotometerswhoseSpectralSlitWidthdoesnotExceed2nm
【原文标准名称】:光谱狭缝宽度不超过2nm的紫外线-可见光分光光度计的校准监测的标准实施规程
【标准号】:ASTME925-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:E13.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:absorbance;molecularspectroscopy;referencematerials;spectrophotometers;UV/visible;wavelength;Absorbance;Absorption--spectrochemicalinstrumentation;Band-passspectrophotometers;Calibration--spectrochemicalanalysisinstrumentation;Molecularsp
【摘要】:Thispracticepermitsananalysttocomparetheperformanceofaninstrumenttothemanufacturer''ssuppliedperformancespecificationsandtoverifyitssuitabilityforcontinuedroutineuse.Italsoprovidesgenerationofcalibrationmonitoringdataonaperiodicbasis,formingabasefromwhichanychangesintheperformanceoftheinstrumentwillbeevident.1.1Thispracticecoverstheparametersofspectrophotometricperformancethatarecriticalfortestingtheadequacyofinstrumentationformostroutinetestsandmethodswithinthewavelengthrangeof200to700nmandtheabsorbancerangeof0to2.Therecommendedtestsprovideameasurementoftheimportantparameterscontrollingresultsinspectrophotometricmethods,butitisspecificallynottobeinferredthatallfactorsininstrumentperformancearemeasured.1.2Thispracticemaybeusedasasignificanttestoftheperformanceofinstrumentsforwhichthespectralbandwidthdoesnotexceed2nmandforwhichthemanufacturer''sspecificationsforwavelengthandabsorbanceaccuracydonotexceedtheperformancetolerancesemployedhere.Thispracticeemploysanillustrativetoleranceofx00B1;1%relativefortheerroroftheabsorbancescaleovertherangeof0.2to2.0,andofx00B1;1.0nmfortheerrorofthewavelengthscale.Asuggestedmaximumstrayradiantpowerratioof4x00D7;10-4yieldsx003C;1%absorbancebiasatanabsorbanceof2.Thesetolerancesarechosentobecompatiblewithmanychemicalapplicationswhilecomfortablyexceedingtheuncertaintyofthecertifiedvaluesforthereferencematerialsandtypicalmanufacturer''sspecificationsforerrorinthewavelengthandabsorbancescalesoftheinstrumentundertest.Theuserisencouragedtodevelopandusetolerancevaluesmoreappropriatetotherequirementsoftheenduseapplication.Thisprocedureisdesignedtoverifyquantitativeperformanceonanongoingbasisandtocompareoneinstrument''sperformancewiththatofothersimilarunits.RefertoPracticeE275toextensivelyevaluatetheperformanceofaninstrument.1.3Thispracticeshouldbeperformedonaperiodicbasis,thefrequencyofwhichdependsonthephysicalenvironmentwithinwhichtheinstrumentationisused.Thus,unitshandledroughlyorusedunderadverseconditions(exposedtodust,chemicalvapors,vibrations,orcombinationsthereof)shouldbetestedmorefrequentlythanthosenotexposedtosuchconditions.Thispracticeshouldalsobeperformedafteranysignificantrepairsaremadeonaunit,suchasthoseinvolvingtheoptics,detector,orradiantenergysource.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:N53
【国际标准分类号】:71_040_50
【页数】:7P.;A4
【正文语种】:英语