BS 4196-1:1991

Committees responsible
National foreword
Method
01 Related International Standards
02 Synopsis of ISO 3741
03 Introduction
1 Scope and field of application
2 References
3 Definitions
4 Acoustical environment
5 Instrumentation
6 Installation and operation of source
7 Measurement of mean-square sound pressure
8 Calculation of sound power level
9 Information to be recorded
10 Information to be reported
Annexes
A Test room qualification procedure for the
    measurement of broad-band sound
B Characteristics and calibration of reference sound
    source
C Procedures for calculating A-weighted sound power
    level from octave or one-third octave-band power
    levels
D Guidelines for the design of reverberation rooms
E Guidelines for the design of rotating diffusers
Tables
1 International Standards specifying various methods
    for determining the sound power levels of machines
    and equipment
2 Uncertainty in determining sound power levels of
    broad-band noise sources in reverberation rooms
3 Minimum volume of the test room as a function of the
    lowest frequency band of interest
4 Relative tolerances for the instrumentation system
5 Corrections for background sound pressure levels
6 Maximum allowable standard deviation of Li
7 Calibration accuracy for reference sound source
8 Values of j and Cj for octave-band data
9 Values of j and Cj for one-third octave-band data
10 Recommended room dimension ratios for rectangular
    rooms

Gives a direct method and a comparison for determining the sound power level produced by a source. Specifies test room requirements, source location and operating conditions, instrumentation and techniques for obtaining an estimate of mean square sound pressure from which the sound power level of the source in octave or one third octave bands is calculated.