ASTM E319-1985(2003) 单盘机械天平的评定
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【英文标准名称】:StandardPracticefortheEvaluationofSingle-PanMechanicalBalances
【原文标准名称】:单盘机械天平的评定
【标准号】:ASTME319-1985(2003)
【标准状态】:现行
【国别】:
【发布日期】:1985
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:E41.06
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:试验;天平;评定;实验室器皿;工艺
【英文主题词】:balances;scales;weighinginstruments
【摘要】:MonitoringWeighingPerformance8212;Thispracticeprovidesresultsintheformofcontrolchartswhichmeasuretheweighingcapabilityatthetimeofthetest.Aseriesoftestsatappropriateintervalswillmonitorbalanceperformanceoveraperiodoftime.Amarkedchangefromexpectedperformancemayresultfromavarietyofcausesincluding:maladjustment,damage,dirt,foreignmaterial,andthermaldisturbances.Ifthetestresultsaretoindicatefutureperformance,anydisturbancesthatoccurexteriortothebalancemustbebroughtundercontrol(2).AcceptanceTests8212;Thispracticemayalsobeusedasacceptancetestsfornewbalances.Forthispurpose,thetestsshouldbeconductedunderfavorable,butnotnecessarilyideal,conditions.Sincesystematicerrorinthecourseofthezeroandthecourseofthesensitivitymaybecausedbydisturbancesexternaltothebalance,limitsontheseerrorsarenotordinarilyprescribedinacceptancerequirements.1.1Thispracticecoverstestingproceduresforevaluatingtheperformanceofsingle-armbalancesrequiredbyASTMstandards.1.2Thispracticeisintendedforbutnotlimitedtosensitivityratiosof10orbetterandon-scalerangesof1000xdormorewhered=readabilityeitherdirectlyorbyestimation.1.3Thispracticecanalsobeappliedtoothersingle-panbalanceswithmechanicalweightchangingofdifferentcapacitiesorsensitivitieswithappropriatetestloadsandcalibrationweights.Note18212;Mechanicalbalancesofthistypehavelargelybeenreplacedbyautomaticelectronicbalancesincorporatingavarietyofoperationalprinciples.Nevertheless,somesingle-panmechanicalbalancesarestillmanufacturedandmanyolderbalanceswillremaininserviceforyearstocome.Onetypeofautomaticelectronicbalance,theso-called"hybrid,"bearsconsiderablesimilaritytosingle-panmechanicalbalancesofthenulltype.(1)1.4Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A85
【国际标准分类号】:
【页数】:9P.;A4
【正文语种】:
【原文标准名称】:单盘机械天平的评定
【标准号】:ASTME319-1985(2003)
【标准状态】:现行
【国别】:
【发布日期】:1985
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:E41.06
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:试验;天平;评定;实验室器皿;工艺
【英文主题词】:balances;scales;weighinginstruments
【摘要】:MonitoringWeighingPerformance8212;Thispracticeprovidesresultsintheformofcontrolchartswhichmeasuretheweighingcapabilityatthetimeofthetest.Aseriesoftestsatappropriateintervalswillmonitorbalanceperformanceoveraperiodoftime.Amarkedchangefromexpectedperformancemayresultfromavarietyofcausesincluding:maladjustment,damage,dirt,foreignmaterial,andthermaldisturbances.Ifthetestresultsaretoindicatefutureperformance,anydisturbancesthatoccurexteriortothebalancemustbebroughtundercontrol(2).AcceptanceTests8212;Thispracticemayalsobeusedasacceptancetestsfornewbalances.Forthispurpose,thetestsshouldbeconductedunderfavorable,butnotnecessarilyideal,conditions.Sincesystematicerrorinthecourseofthezeroandthecourseofthesensitivitymaybecausedbydisturbancesexternaltothebalance,limitsontheseerrorsarenotordinarilyprescribedinacceptancerequirements.1.1Thispracticecoverstestingproceduresforevaluatingtheperformanceofsingle-armbalancesrequiredbyASTMstandards.1.2Thispracticeisintendedforbutnotlimitedtosensitivityratiosof10orbetterandon-scalerangesof1000xdormorewhered=readabilityeitherdirectlyorbyestimation.1.3Thispracticecanalsobeappliedtoothersingle-panbalanceswithmechanicalweightchangingofdifferentcapacitiesorsensitivitieswithappropriatetestloadsandcalibrationweights.Note18212;Mechanicalbalancesofthistypehavelargelybeenreplacedbyautomaticelectronicbalancesincorporatingavarietyofoperationalprinciples.Nevertheless,somesingle-panmechanicalbalancesarestillmanufacturedandmanyolderbalanceswillremaininserviceforyearstocome.Onetypeofautomaticelectronicbalance,theso-called"hybrid,"bearsconsiderablesimilaritytosingle-panmechanicalbalancesofthenulltype.(1)1.4Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A85
【国际标准分类号】:
【页数】:9P.;A4
【正文语种】:
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