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Norm

ÖNORM EN ISO 3743-2

Issue date: 1997 02 01

Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Part ...(abbreviated)

1.1 General This patt of ISO 3743 specifies a relatively simple engineering method for determining the Sound power levels of small, movable noise sources. The measure...
Withdrawn: 2009 12 01
§ Legal References
Publisher:
Austrian Standards International
Format:
Digital | 31 Pages
Language:
German | English
Optionally co-design standards:
1.1 General This patt of ISO 3743 specifies a relatively simple engineering method for determining the Sound power levels of small, movable noise sources. The measurements are carried out when the Source is installed in a specially designed room having a specified reverberation time over the frequency range of interest. The A-weighted Sound power level of the Source under test is determined from a Single Aweighted Sound pressure level measurement at each microphone Position, rather than from a summation of octave-band Ievels. This direct method eliminates the need for a reference Sound Source, but requires the use of a special reverberation test room. The direct method is based on the premise that the Sound pressure level, averaged in space and time in the test room, tan be used to determine the Sound power level emitted by the Source. The properties of the special reverberation test room are Chosen so that the room¿s influence on the Sound power output of the equipment under test is small. The number of microphone positions and Source locations required in the test room are specified. Guidelines for the design of special reverberation rooms are given in annex B. On addition to the direct method, a comparison method is also described (see 8.3). However, since the requirements on the test room for the comparison method of ISO 3743-1 are considerably less restrictive, it is recommended that the comparison method of ISO 3743-1 be used if a special reverberation test room is not available. NOTE 1 Precision methods for the determination of the Sound power levels of small noise sources are specified in ISO 3741 and ISO 3745. 1.2 Types of noise The methods specified in this part of ISO 3743 are suitable for measurements of all types of noise within a specified frequency range, except impulsive noise consisting of isolated bursts of Sound energy. NOTES 2 A classification of different t (...abbreviated)
ÖNORM EN ISO 3743-2
2020 03 15
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ÖNORM EN ISO 3743-2
2009 12 01
Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering ...
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ÖNORM EN ISO 3743-2
1997 02 01
Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering ...
Norm
ÖNORM S 5033
1978 12 01
Determination of sound power levels of noise sources; engineering methods for special reverberation ...
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ÖNORM EN 27574-1
Issue date : 1990 04 01
Acoustics; statistical methods for determining and verifying stated noise emission values of machinery and equipment; general considerations and definitions
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ÖNORM EN 27574-4
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Issue date : 1988 12 15
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Issue date : 1994 02 17
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Issue date : 1977 05 01
Acoustics — Determination of sound power levels of noise sources — Precision methods for anechoic and semi-anechoic rooms
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ISO 6926:1990
Issue date : 1990 10 11
Acoustics — Determination of sound power levels of noise sources — Requirements for the performance and calibration of reference sound sources
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Issue date : 1985 12 19
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ÖNORM EN ISO 3743-2
Issue date : 2009 12 01
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 (ISO 3743-2:1994)
Norm
ISO 3743-2:1994
Issue date : 1994 11 03
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