ForewordIntroductionScopeNormative referencesTerms and definitionsSymbolsSelection of the most appropriate methodGeneralSound power level measurements accuracy gradesGeneralEngineering grade (grade 2)Survey grade (grade 3)Measuring equipmentGeneralCalibrationMeasuring environmentGeneralVerification of acoustic adequacy of test environmentCriteria for background noiseDefinition of noise source and operating conditions of the generating setDefinition of noise source under testLocation, installation of the generating setMounting of the generating setOperation of the generating set during testReference box and measurement surfaceReference boxDetermination of the reference box in special casesElevated generating set on a trailer or trolley kitGenerating set with extended exhaust deviceGenerating set with auxiliary equipmentMeasurement surfaceGeneralMicrophone orientationHemispherical measurement surfaceParallelepiped measurement surfaceReduction in the number of microphone positionsMeasurement of sound pressure levelsDetermination of the A-weighted sound power levelCalculation of mean-time-averaged sound pressure levelsCorrections for background noiseCalculation of the surface time-averaged sound pressure levelsCalculation of sound power levelsCalculation of apparent surface sound pressure level non-uniformity indexA-weighted sound power levelMeasurement uncertaintyGuaranteed sound power levelGeneralArithmetic mean of sound power levelsExpanded measurement uncertaintyCoverage factorDetermination of σDetermination of σDetermination of σCalculation of the guaranteed sound power levelTest reportDetermination of the emission sound pressure level at the workstationGeneralDetermination of location of the workstation(s)Criteria for the adequacy of the test environmentCorrections for background noiseMeasured quantityCalculation of A-weighted emission sound pressure levelNormalizing to reference meteorological conditionsQuantities to be determinedOperation of the generating setMicrophone positionsGeneralMicrophone position for a standing operatorMicrophone position for a bending, crouching or kneeling operatorMicrophone positions if there is no clearly identifiable operator position or for machines without operatorMeasurement uncertaintyTest reportApplication of for generating sets (normative)GeneralMeasuring equipmentGeneralCalibrationOperating conditions during testGeneralGenerating set electrical power during noise measurementsVariable speed engine gensetsFan(s)GeneralFan drive directly connected to the engineFan drive with several distinct speedsFan drive with continuous variable speedWelding generator current during noise measurementsLighting towers electrical power during noise measurementsReference boxMeasurement surfaceGeneralHemispherical measurement surfaceParallelepiped measurement surfaceFrequency range of interestCalculation of A-weighted sound power levelMeasurement uncertaintyGeneralMethodologyDetermination of σDetermination of σGeneralInterlaboratory testReproducibility testsTypical upper bound values of σ for accuracy grade 2Typical upper bound values of σ for accuracy grade 3Expanded measurement uncertainty UTest reportGeneralData of the generating set being testedDetails of measurement conditionsMeasuring equipment usedAcoustical dataSound power level measurement ISO 8528-10 grades 2 and grade 3Emission sound pressure level at the workstation measurement ISO 8528-10 grade 2Application of for generating sets (normative)GeneralReduction in the number of microphone positionsSound intensity methods (informative)Bibliography