Acoustics — Determination of sound power levels and sound energy levels of
noise sources using sound pressure — Engineering methods for small movable
sources in reverberant fields Part 1: Comparison method for a hard-walled
ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS OF NOISE SOURCES USING SOUND PRESSURE - ENGINEERING METHODS FOR SMALL, MOVABLE SOURCES IN REVERBERANT FIELDS - PART 2: METHODS FOR SPECIAL REVERBERATION TEST ROOMS
AMERICAN NATIONAL STANDARD ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS AND SOUND ENERGY LEVELS OF NOISE SOURCES USING SOUND PRESSURE - ENGINEERING METHODS FOR SMALL MOVABLE SOURCES IN REVERBERANT FIELDS - PART 1: COMPARISON METHOD FOR A HARD-WALLED
This part of ISO 3743 specifies methods for determining the
sound power level or sound energy level of a noise source by
comparing measured sound pressure levels emitted by this source
(machinery or equipment) mounted in a hard-walled test room, the
characteristics of which are specified, with those from a
calibrated reference sound source. The sound power level (or, in
the case of noise bursts or transient noise emission, the sound
energy level) produced by the noise source, in frequency bands of
width one octave, is calculated using those measurements. The sound
power level or sound energy level with A-weighting applied is
calculated using the octave-band levels.
Types of noise and noise sources
The method specified in this part of ISO 3743 is suitable for
all types of noise (steady, non-steady, fluctuating, isolated
bursts of sound energy, etc.) defined in ISO 12001.
The noise source under test may be a device, machine, component
or sub-assembly. The maximum size of the source depends upon the
size of the room used for the acoustical measurements.
The test environment that is applicable for measurements made in
accordance with this part of ISO 3743 is a hard-walled test room
with prescribed acoustical characteristics.
Information is given on the uncertainty of the sound power
levels and sound energy levels determined in accordance with this
part of ISO 3743, for measurements made in frequency octave bands
and for A-weighted frequency calculations performed on them. The
uncertainty conforms to ISO 12001:1996, accuracy grade 2
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