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  • BS 7458-1:1991

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    Test code for the measurement of airborne noise emitted by rotating electrical machinery Engineering method for free-field conditions over a reflecting plane

    Available format(s):  Hardcopy, PDF

    Superseded date:  15-04-2000

    Language(s):  English

    Published date:  28-06-1991

    Publisher:  British Standards Institution

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

    Committees responsible
    National foreword
    Method
    0. Introduction
    1. Scope and field of application
    2. References
    3. Definition
    4. Acoustic environment
    5. Instrumentation
    6. Installation and operation of the machine
    7. Sound pressure levels on the measurement surface
    8. Calculation of surface sound pressure level and
         sound power level
    9. Information to be recorded
    10. Information to be reported
    Annexes
    A. Qualification procedures for the acoustic
         environment
    B. Procedures for calculating A-weighted sound power
         level from octave or one-third octave band power
         levels
    C. Method for estimating the difference in noise
         level between no-load and on-load operations
    Tables
    1. Uncertainty in determining sound power levels for
         engineering measurements indoors or outdoors
    2. Corrections for background sound pressure levels
    3. Parameters for calculating A-weighted sound power
         level from octave band power levels
    4. Parameters for calculating A-weighted sound power
         level from one-third octave band power levels
    Figures
    1. Procedure for fixing the measurement positions
         where a side of the measurement surface exceeds 3d
    2. Example of a measurement surface and measurement
         positions (paths) for a small machine
    3. Example of a measurement surface and measurement
         positions (paths) for a long machine
    4. Example of a measurement surface and measurement
         positions (paths) for a large machine
    5. Environmental correction, K, in decibels

    Abstract - (Show below) - (Hide below)

    Method, of engineering grade accuracy, of measuring sound pressure levels around a machine, of calculating band power levels and of determining the A-weighted sound power level.

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

    Committee EH/1
    Document Type Standard
    Publisher British Standards Institution
    Status Superseded
    Superseded By

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

    BS 7458-2:1991 Test code for the measurement of airborne noise emitted by rotating electrical machinery Survey method

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

    ISO 3742:1988 Acoustics — Determination of sound power levels of noise sources — Precision methods for discrete-frequency and narrow-band sources in reverberation rooms
    ISO 2204:1979 Acoustics Guide to International Standards on the measurement of airborne acoustical noise and evaluation of its effects on human beings
    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 354:2003 Acoustics — Measurement of sound absorption in a reverberation room
    BS 4196-4:1981 Sound power levels of noise sources Engineering methods for determination of sound power levels for sources in free-field conditions over a reflecting plane
    ISO 266:1997 Acoustics — Preferred frequencies
    BS 4196-0:1981 Sound power levels of noise sources Guide for the use of basic standards and for the preparation of noise test codes
    BS 4196-2:1991 Sound power levels of noise sources Precision methods for determination of sound power levels for discrete-frequency and narrow-band sources in reverberation rooms
    ISO 3740:2000 Acoustics Determination of sound power levels of noise sources Guidelines for the use of basic standards
    BS 7458-2:1991 Test code for the measurement of airborne noise emitted by rotating electrical machinery Survey method
    BS 4196-8:1991 Sound power levels of noise sources Specification for the performance and calibration of reference sound sources
    BS 4196-5:1981 Sound power levels of noise sources Precision methods for determination of sound power levels for sources in anechoic and semi-anechoic rooms
    IEC 60225:1966 Octave, half-octave and third-octave band filters intended for the analysis of sounds and vibrations
    ISO 1680-2:1986 Acoustics Test code for the measurement of airborne noise emitted by rotating electrical machinery Part 2: Survey method
    ISO 6926:2016 Acoustics Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
    IEC 60034-1:2017 Rotating electrical machines - Part 1: Rating and performance
    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
    ISO 3745:2012 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
    IEC 60651:1979+AMD1:1993+AMD2:2000 CSV Sound level meters
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