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  • ANSI S12.55 : 2012

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS AND SOUND ENERGY LEVELS OF NOISE SOURCES USING SOUND PRESSURE - PRECISION METHODS FOR ANECHOIC ROOMS AND HEMI-ANECHOIC ROOMS

    Available format(s):  Hardcopy, PDF

    Superseded date:  13-07-2019

    Language(s):  English

    Published date:  01-01-2012

    Publisher:  Acoustical Society of America

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    Table of Contents - (Show below) - (Hide below)

    1 Scope
    2 Normative references
    3 Terms and definitions
    4 Reference meteorological conditions
    5 Test rooms
    6 Instrumentation
    7 Definition, location, installation and operation
       of noise source under test
    8 Measurement surface
    9 Determination of sound power levels and sound
       energy levels
    10 Measurement uncertainty
    11 Information to be recorded
    12 Test report
    Annex A (normative) - General procedures for
            qualification of anechoic and hemi-anechoic
            rooms
    Annex B (normative) - Qualification procedure for
            spaces within test rooms used in the
            determination sound power levels and
            sound energy levels of specific noise
            sources
    Annex C (normative) - Calculation of A-weighted
            sound power levels and A-weighted sound
            energy levels from one-third-octave band
            levels
    Annex D (normative) - Array of microphone positions
            on a spherical measurement surface in
            a free field
    Annex E (normative) - Arrays of microphone positions
            on a hemispherical measurement surface in
            hemi-free field
    Annex F (normative) - Coaxial circular paths of
            microphones on a hemispherical measurement
            surface a hemi-free field
    Annex G (normative) - Meridional paths of microphones
            on a hemispherical measurement surface
            in hemi-free field
    Annex H (normative) - Spiral paths of microphones on
            a hemispherical measurement surface
            in a hemi-free field
    Annex I (informative) - Guidance on the development
            of information on measurement uncertainty
    Bibliography

    Abstract - (Show below) - (Hide below)

    Defines methods for measuring the sound pressure levels on a measurement surface enveloping a noise source (machinery or equipment) in an anechoic room or a hemi-anechoic room.

    General Product Information - (Show below) - (Hide below)

    Committee S12
    Development Note Supersedes ANSI S12.35 (07/2006) Also numbered as ISO 3745. (11/2012) NEW CHILD AMD 1 2021 IS NOW ADDED
    Document Type Revision
    Product Note NEW CHILD AMD 1 2021 IS NOW ADDED
    Publisher Acoustical Society of America
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    AHRI 530 : 2005 RATING OF SOUND AND VIBRATION FOR REFRIGERANT COMPRESSORS
    ANSI S12.69 : 2010 PROCEDURE FOR TESTING RAILROAD HORNS EX SITU
    ASA/ANSI S12.10 PART 2:2011(R2020) ACOUSTICS - MEASUREMENT OF AIRBORNE NOISE EMITTED BY INFORMATION TECHNOLOGY AND TELECOMMUNICATIONS EQUIPMENT - PART 2: DECLARATION OF NOISE EMISSION LEVELS
    ANSI/ASA S12.10 PART 1:2010(R2020) ACOUSTICS - MEASUREMENT OF AIRBORNE NOISE EMITTED BY INFORMATION TECHNOLOGY AND TELECOMMUNICATIONS EQUIPMENT - PART 1: DETERMINATION OF SOUND POWER LEVEL AND EMISSION SOUND PRESSURE LEVEL
    ANSI S1.17-1 : 2014 MICROPHONE WINDSCREENS - PART 1: TEST PROCEDURES FOR MEASUREMENTS OF INSERTION LOSS IN STILL AIR
    ANSI/ASA S12.10 PART 2 : 2011 ACOUSTICS - MEASUREMENT OF AIRBORNE NOISE EMITTED BY INFORMATION TECHNOLOGY AND TELECOMMUNICATIONS EQUIPMENT - PART 2: DECLARATION OF NOISE EMISSION LEVELS
    ANSI/ASA S12.10 PART 1 : 2010 ACOUSTICS - MEASUREMENT OF AIRBORNE NOISE EMITTED BY INFORMATION TECHNOLOGY AND TELECOMMUNICATIONS EQUIPMENT - PART 1: DETERMINATION OF SOUND POWER LEVEL AND EMISSION SOUND PRESSURE LEVEL

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 7574-2:1985 Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 2: Methods for stated values for individual machines
    ISO 4871:1996 Acoustics — Declaration and verification of noise emission values of machinery and equipment
    IEC 61183:1994 Electroacoustics - Random-incidence and diffuse-field calibration of sound level meters
    ISO 12001:1996 Acoustics Noise emitted by machinery and equipment Rules for the drafting and presentation of a noise test code
    ISO 3744:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering methods for an essentially free field over a reflecting plane
    ISO 3743-2:1994 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 7574-4:1985 Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 4: Methods for stated values for batches of machines
    ISO/TR 25417:2007 Acoustics Definitions of basic quantities and terms
    ISO 9614-1:1993 Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 1: Measurement at discrete points
    IEC 60942:2003 Electroacoustics - Sound calibrators
    ISO 26101:2017 Acoustics Test methods for the qualification of free-field environments
    ISO 3747:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering/survey methods for use in situ in a reverberant environment
    ISO 3740:2000 Acoustics Determination of sound power levels of noise sources Guidelines for the use of basic standards
    ISO 140-3:1995 Acoustics — Measurement of sound insulation in buildings and of building elements — Part 3: Laboratory measurements of airborne sound insulation of building elements
    ISO 9613-1:1993 Acoustics Attenuation of sound during propagation outdoors Part 1: Calculation of the absorption of sound by the atmosphere
    ISO 9614-2:1996 Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 2: Measurement by scanning
    ISO 7574-1:1985 Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 1: General considerations and definitions
    ISO 80000-8:2007 Quantities and units Part 8: Acoustics
    ISO 3746:2010 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
    ISO 11690-1:1996 Acoustics Recommended practice for the design of low-noise workplaces containing machinery Part 1: Noise control strategies
    ISO 6926:2016 Acoustics Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
    ISO 9614-3:2002 Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 3: Precision method for measurement by scanning
    ISO 7574-3:1985 Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 3: Simple (transition) method for stated values for batches of machines
    ISO 3741:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for reverberation test rooms
    IEC 61260:1995 Electroacoustics - Octave-band and fractional-octave-band filters
    ISO 11201:2010 Acoustics Noise emitted by machinery and equipment Determination of emission sound pressure levels at a work station and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections
    ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
    ISO 3743-1:2010 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
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