National foreword
Committees responsible
Method
0 Introduction
1 Scope and field of application
2 Conformance
3 References
4 Definitions
5 Method for determining sound power levels of
equipment in reverberation rooms
6 Method for determining sound power levels of
equipment over a reflecting plane
7 Method for measuring sound pressure levels at the
operator and bystander positions
Annexes
A Standard test table
B Alternative measurement surfaces for sound power
measurements in accordance with clause 6
C Installation and operating conditions for specific
equipment categories
D Measurement of impulsive sound pressure levels and
discrete tones at the operator position
Tables
1 Uncertainty in determining sound power levels in a
reverberation room
2 Minimum room volume as a function of the lowest
frequency band of interest
3 Procedures to be followed for measuring discrete-
frequency components or narrow bands of noise
4 Number of microphone positions required and
constant k for determining the number of equipment
locations
5 Values of the A-weighting Aj, for j = 1 to jmax = 7
6 Values of the A-weighting Aj, for j = 1 to jmax = 21
7 Uncertainty in determining sound power levels in a
free field over a reflecting plane
8 Coordinates of key microphone positions for
arrangement 1
9 Coordinates of key microphone positions for
arrangement 2
10 Uncertainty in determining time-average sound
pressure level at the operator position over a
reflecting plane
11 Hemispherical measurement surface - 10 measurement
positions
12 Hemispherical measurement surface - 10 measurement
positions
13 Number of characters to be used
Figures
1 Measurement surface with 9 microphone positions
2 Measurement surface for floor-standing equipment in
front of a wall
3 Examples of microphone positions for standing and
seated operators
4 Example of a standard test table
5 Hemispherical surface - 10 measurement positions
6 Hemispherical measurement surface - Circular paths
for microphone traverse
7 Insertion of a single sheet of paper
8 Example of full print page: line length of 60 to 110
characters
9 Example of full print page: line length of more than
110 characters