BS EN ISO 3741:2009

Foreword
0 Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement uncertainty
5 Acoustic environment
6 Instrumentation
7 Installation and operation of source under test
8 Sound pressure measurements and sound power
   determination
9 Information to be recorded
10 Information to be reported
Annex A (normative) - Room qualification procedure for
        the measurement of discrete-frequency
        components
Annex B (informative) - Guidelines for the design of
        rotating diffusing vanes
Annex C (informative) - Extension for frequencies
        below 100 Hz
Annex D (informative) - Guidelines for the design of
        reverberation rooms
Annex E (normative) - Test room qualification procedure
        for the measurement of broad-band sound
Annex F (normative) - Procedure for calculating octave
        band sound power levels and an A-weighted sound power
        level from one-third-octave band sound power levels
Bibliography
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of
         EU Directive 98/37/EC
Annex ZB (informative) - Relationship between this European
         Standard and the Essential Requirements of
         EU Directive 2006/42/EC

Gives a direct method and a comparison method for determining the sound power level that would be produced by a source operating in an environment at standard meteorological conditions corresponding to a characteristic impedance of [rho]c = 400 N.s/m[3]. Provides test room requirements, source location and general rules for operating conditions, instrumentation and techniques for obtaining an estimate of mean-square sound pressure levels from which the sound power levels of the source in octave or one-third-octave bands are calculated with a grade 1 accuracy.

1.1 This International Standard specifies a direct method and a comparison method for determining the sound power level that would be produced by a source operating in an environment at standard meteorological conditions corresponding to a characteristic impedance of ρc = 400 N.s/m³ (where ρ is the density of air and c is the speed of sound). It specifies test room requirements, source location and general rules for operating conditions, instrumentation and techniques for obtaining an estimate of mean-square sound pressure levels from which the sound power levels of the source in octave or one-third-octave bands are calculated with a grade 1 accuracy. The quantities to be measured are time-averaged sound pressure levels in frequency bands. The quantities to be determined are sound power levels, A-weighted and in frequency bands. Other quantities, which are optional, are sound power levels with other frequency weightings calculated from the measurements in frequency bands. This standard does not provide the means to determine directivity and temporal variation of sound from a source.

In general, the frequency range of interest includes the one-third-octave bands with midband frequencies from 100 Hz to 10 000 Hz. Guidelines for the application of the specified methods in an extended frequency range in respect to lower frequencies are given in annex C. This International Standard is not applicable to frequency ranges above the 10 000 Hz one-third-octave band. For higher frequencies the use of methods given in ISO 9295 is recommended.

1.2 The method specified in this International Standard is suitable for steady noise with broad-band, narrow-band and discrete-frequency components as described in ISO 12001. The noise may be emitted from a device, machine, component or sub-assembly.

This International Standard is applicable to noise sources with volumes which are preferably not greater than 2 % of the volume of the reverberation room used for the test. For sources with volumes greater than 2 % of the room volume, the standard deviations given by Table 2 could be exceeded.