BS 4196-2:1991

Committees responsible
National foreword
Method
0.1 Related International Standards
0.2 Synopsis of ISO 3742
0.3 Introduction
1 Scope and field of application
2 References
3 Determination of the significance of discrete-
     frequency components and narrow bands of noise
4 Number of microphone positions and source locations
Annex
A Alternative qualification procedure for the
     measurement of discrete-frequency components
Tables
1 International Standards specifying various methods
     for determining the sound power levels of machines
     and equipment
2 Uncertainty in determining sound levels of
     discrete-frequency noise sources in reverberation
     rooms
3 Procedures to be followed in the measurement of
     discrete-frequency components or narrow bands of
     noise
4 Number of microphone positions required and
     constant K for determining number of source
     locations
5 Test frequencies (or periods) for qualification of
     facility for measuring sounds containing
     significant discrete-frequency components
6 Maximum allowable standard deviation of Li

Explains special requirements that are necessary for accurate determinations of the sound power when discrete frequencies or narrow bands of noise are radiated by a source.