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,70,80,84,85or90dB CriterionDuration(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)