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2011 Edition, March 1, 2011

Complete Document

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 test room - Nationally Adopted International Standards

Includes all amendments and changes through Reaffirmation Notice , February 25, 2016

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SAME AS ISO 3743-1
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Product Details:

  • Revision: 2011 Edition, March 1, 2011
  • Published Date: February 25, 2016
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Acoustical Society of America (ASA)
  • Page Count: 54
  • ANSI Approved: Yes
  • DoD Adopted: No

Description / Abstract:


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 Aweighting 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 (see 4.2). 

Test environment

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. 

Measurement uncertainty

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 Aweighted frequency calculations performed on them. The uncertainty conforms to ISO 12001:1996, accuracy grade 2 (engineering grade).