Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement uncertainty
5 Test room requirements
5.1 General
5.2 Criterion for adequacy of the test room
5.3 Criterion for background noise
5.4 Criterion for temperature
5.5 Humidity correction
6 Instrumentation
6.1 General
6.2 Calibration
7 Installation and operation of source under test
7.1 General
7.2 Source location
7.3 Source mounting
7.4 Auxiliary equipment
7.5 Operation of source under test
8 Measurement of sound pressure levels for the determination
of sound power level
8.1 General
8.2 Measurement surface
8.3 Microphone positions
8.4 Conditions of measurement
8.5 Data to be obtained
8.6 Correction for background sound pressure levels
8.7 Calculation of surface sound pressure level
9 Measurement of single-event sound pressure levels for the
determination of sound energy level
10 Calculation of sound power level and sound energy level
10.1 Sound power level
10.2 Sound energy level
11 Information to be recorded
11.1 General
11.2 Sound source under test
11.3 Acoustic environment
11.4 Instrumentation
11.5 Acoustic data
12 Information to be reported
Annex A (normative) General procedures for qualification of
anechoic and hemi-anechoic rooms
Annex B (normative) Alternative qualification procedure for
anechoic and hemi-anechoic rooms for the
determination of sound power levels of
specific noise sources
Annex C (normative) Array of microphone positions in a free
field
Annex D (normative) Array of microphone positions in a free
field over a reflecting plane
Annex E (normative) Coaxial circular paths of microphones in
a hemi-free field
Annex F (normative) Meridional paths of microphones in a
hemi-free field
Annex G (normative) Spiral paths of microphones in a hemi-free
field
Annex H (normative) Calculation of A-weighting sound power level
from one-third-octave-band sound power levels
Annex I (normative) Calculation of directivity index and
directivity factor
Annex J (informative) Measurement uncertainty
Annex K (informative) Guidelines for the design of test rooms
Bibliography