NS EN ISO 3741 : 2010
Current
The latest, up-to-date edition.
ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS AND SOUND ENERGY LEVELS OF NOISE SOURCES USING SOUND PRESSURE - PRECISION METHODS FOR REVERBERATION TEST ROOMS
12-01-2013
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement uncertainty
5 Acoustic environment
5.1 General
5.2 Volume and shape of test room
5.3 Requirements for absorption of test room
5.4 Requirements for background noise level
5.5 Requirements for temperature, humidity and
pressure
6 Instrumentation
6.1 General
6.2 Calibration
7 Installation and operation of source under test
7.1 General
7.2 Source location
7.3 Source mounting
7.4 Auxiliary equipment
7.5 Operation of source during test
8 Sound pressure measurements and sound power
determination
8.1 Initial measurements
8.2 Additional measurements
8.3 Determination of average sound pressure level
in the test room
8.4 Determination of the sound power level of the
sound source
8.5 Determination of A-weighted sound power level
of the source
9 Information to be recorded
9.1 Noise sources under test
9.2 Acoustical environment
9.3 Instrumentation
9.4 Acoustical data
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 (normative) - Normative references to
international publications with their relevant
European publications
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