Simpson897声极计ConformstoANSIS1.4-1983,ANSIS1.25-1978,andIEC651-1979SpecificationsChoiceofExchangeRates(3,4,or5dB)andCriterionLevels(70,80,84,85,or90dB)SelectableThresholdLevelfrom50-99dBin1dBIncrementsDualRange(50-100dBand80-130dB)RealTimeClockWithRechargeableBatterySecurityLockoutFeatureWithInternalDataStorageSelf-TestModesTestOperationalReadinessPowerRequirementsNi-CadRechargeablebatterypackWarm-UpTime1minuteDimensions6.8"(H)x3.1"(W)x1.1"(D),(172x80x28mm)Weight18oz.(500g)includingbatterypackCaseConstructionAnodizedaluminumextrusionSecurityFeatureLocks-inoperatingfunctionRealTimeClockClockcontinuesrunninginallfunctionsPerformanceCapabilityConformstoANSIS1.4-1983andIEC651-1971forsoundlevelfunctionandANSIS1.25-1978fordosimeterfunctionandANSIS1.25-1978fordosimeterfunctionSoundLevelModeRanges50to100dB,80to130dBAccuracyTrueRMS,TypeS2DynamicRangeSelectablefrom50to100dBand80to130dBFrequencyResponseWeighting"A"WeightingResponseTimeSlow(1second)CrestFactor10:1atmaximumindicationFrequencyRange20Hzto8KHzDosimeterModeThresholdLevelSelectablefrom50-99dBin1dBincrementsCriterionLevelSelectable,70,80,84,85or90dBCriterionDuration(TC)Eight(8)HoursExchangeRateSelectable3,4or5dBMaximumIndication999.9%DOSEResolution0.1%DOSEto999.9%ElapsedTimeDisplayseitherHours:MinutesorMinutes:Seconds,upto99Hours59Minutes,59Seconds.TimingAccuracy:0.05%140dBPeakDisplaysnumberof140dBpeaksthathavebeendetectedMicrophoneType0.52"(13.2mm)DiameterElectretCondenser,Omnidirectional70°angleofincidence.Maximumsoundpressurelevel148dBDisplayNumerical4DigitLCDAnnunciatorsLoBatt,SplMax,Int60,%Dose,dBA,plusacolonanddecimalpointEnvironmentalOperatingTemperatureOperatingTemperature:-10°to50°CTemperatureCoefficient±0.05dBper°C(25°to50°C)forreferencemea-surementof105dBat1000HzRelativeHumidity<0.5dB(0-95%RH)StorageRange-30°to45°C(withoutbatteries)MagneticFieldInfluenceNoeffectinfieldof1oersted(80A/m))