NEN EN ISO 9614-3 : 2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
   4.1 Size of sound source under test
   4.2 Character of sound radiated by the source
   4.3 Measurement uncertainty
5 Acoustic environment
   5.1 Criteria for adequacy of the test environment
   5.2 Extraneous intensity
   5.3 Wind and gas flows
   5.4 Temperature
   5.5 Configuration of the surroundings
   5.6 Atmospheric conditions
6 Instrumentation
   6.1 General
   6.2 Calibration and field check
   6.3 Time-series of sound intensity and sound pressure
7 Installation and operation of the source
   7.1 General
   7.2 Operating conditions of the source under test
8 Measurement of normal sound intensity component levels
   8.1 Determination of measurement surface
   8.2 Determination of scanning paths and segments
   8.3 Measurements
   8.4 Further actions
9 Determination of sound power level
   9.1 Calculation of partial sound powers for each
        partial surface of the measurement surface
   9.2 Calculation of normalized sound power level
10 Information to be recorded
Annex A (informative) List of symbols used in this part of
        ISO 9614
Annex B (normative) Calculation of field indicators
        B.1 General
        B.2 Definition of field indicators
Annex C (normative) Procedure for achieving the desired
        accuracy
        C.1 Qualification requirements
        C.2 Action to be taken to increase the grade of
             accuracy of determination
Annex D (informative) Effects of airflow on measurement
        of sound intensity
Annex E (informative) Effect of sound absorption
        within the measurement surface
Annex F (informative) Measurement surface and scanning
        procedure
Annex G (informative) Procedure for obtaining
        time-averaged intensities and squared pressures
        from a sequence of short-time averaged
        intensities and squared pressures
Annex H (informative) Normalization of sound power level
        H.1 General
        H.2 Calculation of normalized sound power level
Annex I (informative) Field indicators used in ISO 9614-1,
        ISO 9614-2 and ISO 9614-3
Bibliography

Defines a method for measuring the component of sound intensity normal to a measurement surface, which is chosen so as to enclose the sound source(s) of which the sound power level is to be determined.