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  • BS 4196-5:1981

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Sound power levels of noise sources Precision methods for determination of sound power levels for sources in anechoic and semi-anechoic rooms

    Available format(s):  Hardcopy, PDF

    Superseded date:  18-12-2003

    Language(s):  English

    Published date:  30-01-1981

    Publisher:  British Standards Institution

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

    National foreword
    Cooperating organizations
    Method
    0.1 Related International Standards
    0.2 Synopsis of ISO 3745
    0.3 Introduction
    1 Scope and field of application
    2 References
    3 Definitions
    4 Test room requirements
    5 Instrumentation
    6 Installation and operation of source
    7 Determination of mean-square pressure
    8 Calculation of sound power level
    9 Information to be recorded
    10 Information to be reported
    Annexes
    A Test room qualification procedures
    B Recommended array of microphone positions in a free
         field
    C Basic array of microphone positions in a free field
         over a reflecting plane
    D Coaxial circular paths in parallel planes for
         microphone traverses in a free field over a
         reflecting plane
    E Calculation of directivity index and directivity
         factor
    F System for microphone traverses along meridional
         paths in a free field
    G Guidelines for the design of test rooms
    H Examples of suitable instrumentation systems
    I Guidelines for the detection of impulsive noise
    Tables
    1 International Standards specifying various methods
         for determining the sound power levels of machines
         and equipment
    2 Uncertainty in determining sound power levels of
         sound sources in anechoic rooms
    3 Uncertainty in determining sound power levels of
         sound sources in semi-anechoic rooms
    4 Relative tolerances for the instrumentation system
    5 Corrections for background sound pressure levels
    6 Maximum allowable differences between the measured
         and theoretical values
    7 Microphone positions
    8 Recommended microphone positions when the source
         emits predominant pure tones
    Figures
    1
    2
    3
    4

    Abstract - (Show below) - (Hide below)

    Describes two laboratory methods for determining the sound power level of a source. It gives requirements for the test room, as well as the source location, operating conditions and instrumentation. Techniques are specified for obtaining an estimate of the surface sound pressure level from which the weighted sound power level of the source as well as the sound power level in octave or one-third octave bands may be calculated. Intended to prescribe techniques for acoustical measurements that may be used in test codes for particular types of equipment.

    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 4196-2:1981 Sound power levels of noise sources Precision methods for determination of sound power levels for discrete-frequency and narrow-band sources in reverberation rooms
    BS EN 61096:1993 Methods of measuring the characteristics of reproducing equipment for digital audio compact discs
    BS 6805-2:1987 Statistical methods for determining and verifying stated noise emission values of machinery and equipment Method for determining and verifying stated values for individual machines
    BS 5944-4:1984 Measurement of airborne noise from hydraulic fluid power systems and components Method of determining sound power levels from valves controlling flow and pressure
    BS 4196-1:1981 Sound power levels of noise sources Precision methods for determination of sound power levels for broad-band sources in reverberation rooms
    BS 848-2:1985 Fans for general purposes Methods of noise testing
    BS 5944-1:1992 Measurement of airborne noise from hydraulic fluid power systems and components Method of test for pumps
    BS 5944-2:1992 Measurement of airborne noise from hydraulic fluid power systems and components Method of test for motors
    BS 7458-2:1991 Test code for the measurement of airborne noise emitted by rotating electrical machinery Survey method
    BS 7458-1:1991 Test code for the measurement of airborne noise emitted by rotating electrical machinery Engineering method for free-field conditions over a reflecting plane
    BS 4196-3:1981 Sound power levels of noise sources Engineering methods for determination of sound power levels for sources in special reverberation test rooms
    BS 5944-2:1980 Measurement of airborne noise from hydraulic fluid power systems and components Method of test for motors
    BS 5724-2.23(1986) : LATEST MEDICAL ELECTRICAL EQUIPMENT - PARTICULAR REQUIREMENTS FOR SAFETY - SPECIFICATION FOR OXYGEN CONCENTRATORS FOR HOSPITAL AND DOMICILIARY USE
    BS 7135-1:1989 Noise emitted by computer and business equipment Method of measurement of airborne noise
    BS 6805-3:1987 Statistical methods for determining and verifying stated noise emission values of machinery and equipment Method for determining and verifying stated values for batches of machines using a simple (transition) method
    BS 6840-5:1990 Sound system equipment Methods for specifying and measuring the characteristics of loudspeakers
    BS 5944-1:1980 Measurement of airborne noise from hydraulic fluid power systems and components Method of test for pumps
    BS 6805-1:1987 Statistical methods for determining and verifying stated noise emission values of machinery and equipment Glossary of terms
    BS 7025:1988 Method for preparation of test codes of engineering grade for measurement at the operator\'s or bystander\'s position of noise emitted by machinery
    BS 6805-4:1987 Statistical methods for determining and verifying stated noise emission values of machinery and equipment Methods for determining and verifying stated values for batches of machines
    BS 5793-8.1:1986 Industrial-process control valves. Noise considerations Method for laboratory measurement of noise generated by aerodynamic flow through control valves
    BS 5724-2.28(1990) : 1990 MEDICAL ELECTRICAL EQUIPMENT - PARTICULAR REQUIREMENTS FOR SAFETY - SPECIFICATION FOR SUCTION EQUIPMENT
    BS 5793-8.2(1991) : 1991 AMD 7819 INDUSTRIAL-PROCESS CONTROL VALVES - NOISE CONDITIONS - METHOD FOR LABORATORY MEASUREMENT OF NOISE GENERATED BY HYDRODYNAMIC FLOW THROUGH CONTROL VALVES
    BS 6686-1:1986 Methods for determination of airborne acoustical noise emitted by household and similar electrical appliances General requirements for testing

    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
    ISO 266:1997 Acoustics — Preferred frequencies
    ISO 3740:2000 Acoustics Determination of sound power levels of noise sources Guidelines for the use of basic standards
    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
    IEC 60225:1966 Octave, half-octave and third-octave band filters intended for the analysis of sounds and vibrations
    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 60179:1973 Precision sound level meters
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