Sheet1Requirements of ISO 3745to achieve grade-1 accuracy in obtained Sound Power levelENVICONBOSCHThings neededRequirementRemarksThings neededRequirementRemarksMicrophonesShall be Class-1 as per IEC-61672-1OK/Not OKTest Roomshall be having a Free field /a Free field over a reflecting surfaceAs per annex A or annex B (Ok/Not Ok)AnalyzerShall be Class-1 as per 61260OK/Not OKBackground noiseat all microphone locaitons & at each frequency bands, Lsource-Lbackground= >10 dBOk /Not OkAcoustic CalibratorShall be Class-1 as per IEC-60942OK/Not OKRoom temperatureshall be within 15 - 30 degree celciusok/not okBarometric Pressure indicatorshall have 200 times the source volumeTemperature IndicatorShall have < 1 degree uncertainityOK/Not OKRelative Humidity indicatorShall have than 2*(Lhighest-Llowest) in any location & in any frequency bandgenerally, minimum 20 positionsDataLA & 1/3 Octave level of sourceLA & 1/3 Octave level of backgroundRoom temperatureBarometric pressureRelative humidityDuration of measurementatleast 30 seconds at each positionInner surfacer1 =16.2831853072innerr=1Outer surfacer2=225.1327412287outerr=2Hemi-anachoic roomAs per StandardAs per RadiusAs per Standard60 degree horizontal distanceAs per RadiusXYZXYZXYZXYZ1-100.025-100.0251-100.06250.9980449639-100.062520.5-0.860.0750.5-0.860.07520.49-0.840.18750.98226460280.49-0.840.187530.50.860.1250.50.860.12530.480.820.31250.94991775960.480.820.31254-0.490.850.175-0.490.850.1754-0.450.780.43750.8992184106-0.450.780.43755-0.49-0.840.225-0.49-0.840.2255-0.41-0.720.56250.8267972847-0.41-0.720.562560.9600.2750.9600.27560.7200.68750.72618437740.7200.687570.470.820.3250.470.820.32570.30.50.81250.58296119080.30.50.81258-0.9300.375-0.9300.3758-0.3400.93750.3479852727-0.3400.937590.45-0.780.4250.45-0.780.425100.8800.4750.8800.47511-0.430.740.525-0.430.740.52512-0.41-0.710.575-0.41-0.710.575130.39-0.680.6250.39-0.680.625140.370.640.6750.370.640.67515-0.6900.725-0.6900.72516-0.32-0.550.775-0.32-0.550.7750.125170.5700.8250.5700.8250.062518-0.240.420.875-0.240.420.87519-0.3800.925-0.3800.925200.11-0.190.9750.11-0.190.975663981071.70553498663981071.70553498663981071.70553498663981071.7055349872.020599913315924286.8221399

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Frequency range for sound power measurementsAlternator SpeedOrder6000rpm10000rpm14000rpm18000rpmFrequency Range1X~20X100 Hz to 2000 Hz166 Hz to 3333 Hz233 Hz to 4666 Hz300 Hz to 6000 Hz21X~42X2100 Hz to 4200 Hz3500 Hz to 7000 Hz4900 Hz to 9800 Hz6300 Hz to 12600 Hz