National foreword
Committees responsible
Method
0.1 Related International Standards
0.2 Synopsis of ISO 3747
0.3 Introduction
1 Scope and field of application
2 References
3 Definitions
4 Acoustic environment
5 Instrumentation
6 Installation and operation of sources
7 Sound pressure levels on measurement surface
8 Calculation of sound power level
9 Information to be recorded
10 Information to be reported
Tables
1 International Standards specifying various methods
for determining the sound power levels of machines
and equipment
2 Uncertainty in determining A-weighted sound power
level by the survey method
3 Corrections for background sound pressure levels
4 A-weighting constant
Figures
1 Typical cases for five-sided measurement surface
2 Typical cases for four-sided measurement surface
3 Typical case for three-sided measurement surface
4 Typical cases for two-sided measurement surface
5 Typical case for one-sided measurement surface
6 Key and additional microphone positions for four-
sided measurement surface
7 Key and additional microphone positions for three-
sided measurement surface
8 Key and additional microphone positions for two-
sided measurement surface
9 Key and additional microphone positions for one-
sided measurement surface
10 Key and additional microphone positions for five-
sided measurement surface
11 Key position of the reference sound source when
I3 < or = 1,5 d
12 Key positions of the references sound source when
I3 > 1,5 d
13 Example of reference sound source positions with
long source under test (3d < I1 < or = 6d)
14 Example of reference sound source positions with
flat, broad, long source under test
(2d < I2 < or = 3d)
15 Example of reference sound source positions with
long source under test (3d < I1 < or = 6d) when
I3 > or = 1,5 d (high source under test)