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NL-28声级计是日本理音最新推出的声级计，NL-28是替代原来NA-27的新产品!SoundLevelMeterand1/3octavebandreal-timeanalyzerNA-28RealTimeOctaves(16Hzto16kHz)or1/3octaves(12.5Hzto20kHz)RealTimeSimultaneousOctaves(16Hzto8kHz)and1/3Octaves(12.5Hzto12.5kHz)DatastoredastextfilesdirecttoCFcardMeasuresandlogseq,max,minand5percentilevalues(LN)inoctavesand/or1/3octavesAutoStores300000datasetsor1000hoursof1second1/3octavesonto1GBCFcardAutoStores1000datasetsor10000of1second1/3octavestointernalmemoryManualStoragefor1000datasetsinternallyor100000datasetsto1GBCFcardLinearity110dBinSoundLevelMeterModeand95dBinAnalyzerMode16hoursbatterylifewith4Alkaline"C"CellsMainandSub-Channelforsimultaneousselectionof2timeorfrequencyweightingsF(Fast),S(Slow),10msTimeWeightingsplusPeak ImpulseonSub-ChannelDatatransferusingCFcardorUSB(meter/CFcardappearingasvirtualdisk)MeasurementcanbestartedbyinternalorexternaltriggerComparatoroutputtotriggerexternaldevicesACandDCoutputsofmainand/orsub-channelExpandablefunctionalityusingprogrammecardsIEC61672-1:2002Class1，IEC61260:1995Class1，ANSIS1.4-1983Type1，ANSIS1.11-2004Class1