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SN EN ISO 3746:2011

Current
Current

The latest, up-to-date edition.

ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS AND SOUND ENERGY LEVELS OF NOISE SOURCES USING SOUND PRESSURE - SURVEY METHOD USING AN ENVELOPING MEASUREMENT SURFACE OVER A REFLECTING PLANE
Available format(s)

Hardcopy

Language(s)

German - English

Published date

03-01-2011

Committees responsible
National foreword
Foreword
Introduction
Method
1 Scope
2 Normative references
3 Definitions
4 Acoustic environment
5 Instrumentation
6 Installation and operation of source under test
7 Measurement of sound pressure levels
8 Calculation of A-weighted surface sound pressure
      level and A-weighted sound power level
9 Information to be recorded
10 Information to be reported
Annexes
A (normative) Qualification procedures for the
      acoustic environment
B (normative) Microphone array on the hemispherical
      measurement surface
C (normative) Microphone array on the parallelepiped
      measurement surface
D (informative) Guidelines for the detection of
      impulsive noise
E (informative) Bibliography
Tables
0.1 Overview of International Standards for
      determination of sound power levels of noise sources
      using enveloping surface methods over a reflecting
      plane and giving different grades of accuracy
1 Estimated upper values of the standard deviations of
      reproducibility of A-weighted sound power levels
      determined in accordance with this International
      Standard
A.1 Approximate values of the mean sound absorption
      coefficient alpha
B.1 Coordinates of key microphone positions (4,5,6,10)
      and additional microphone positions (14,15,16,20)
B.2 Coordinates of microphone positions (4,5,6,10) for
      sources emitting discrete tones
Figures
1 Examples illustrating reference boxes and
      characteristic source dimensions d0 with respect to
      the origin of the coordinate system Q
A.1 Environmental correction K2A, in decibels
B.1 Microphone array on the hemisphere - key microphone
      positions
B.2 Microphone array on the hemisphere
B.3 Plain view of a spherical measurement surface and
      microphone positions around a reference box adjacent
      to two reflecting planes
C.1 Procedure for fixing the specified microphone
      positions where a side of the measurement surface
      exceeds 3d
C.2 Example of a measurement surface and microphone
      positions for a small machine
C.3 Example of a measurement surface and microphone
      positions for a tall machine with a small base area
C.4 Example of a measurement surface and microphone
      positions for a long machine
C.5 Example of a measurement surface and microphone
      positions for a medium-sized machine
C.6 Example of a measurement surface and microphone
      positions for a large machine
C.7 Measurement surface (parallelpiped) with four
      microphone positions for floor-standing appliances
      placed against a wall
C.8 Measurement surface (parallelpiped) with three
      microphone positions for floor-standing appliances
      placed against two walls

ISO 3746:2010 specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping a noise source (machinery or equipment) in a test environment for which requirements are given.

Committee
INB/NK 103
DocumentType
Standard
Pages
0
PublisherName
Swiss Standards
Status
Current

Standards Relationship
I.S. EN ISO 3746:2010 Identical
UNI EN ISO 3746 : 2011 Identical
NS EN ISO 3746 : 2010 Identical
NBN EN ISO 3746 : 2011 Identical
EN ISO 3746:2010 Identical
ISO 3746:2010 Identical
NEN EN ISO 3746 : 2010 Identical
BS EN ISO 3746:2009 Identical
NF EN ISO 3746 : 2012 Identical
UNE-EN ISO 3746:2010 Identical

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