BS 4196-1:1991
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Sound power levels of noise sources Precision methods for determination of sound power levels for broad-band sources in reverberation rooms
Hardcopy , PDF
15-06-2000
English
28-03-1991
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
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