• AS 1217.6-1985

    Withdrawn A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

    Acoustics - Determination of sound power levels of noise sources Precision methods for anechoic and hemi-anechoic rooms

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Withdrawn date:  30-06-2017

    Language(s):  English

    Published date:  01-01-1985

    Publisher:  Standards Australia

    Add To Cart

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

    1 - AS 1217.6-1985 ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS OF NOISE SOURCES - PRECISION METHODS FOR ANECHOIC AND HEMI-AN
    4 - PREFACE
    5 - CONTENTS
    7 - FOREWORD
    8 - SYNOPSIS
    9 - SECTION 1. SCOPE AND GENERAL
    9 - 1.1 SCOPE.
    9 - 1.2 FIELD OF APPLICATION.
    9 - 1.2.1 General.
    9 - 1.2.2 Types of noise.
    9 - 1.2.3 Size of source.
    9 - 1.3 REFERENCED DOCUMENTS.
    9 - 1.4 MEASUREMENT UNCERTAINTY.
    10 - 1.5 DEFINITIONS.
    10 - 1.5.1 Free sound field
    10 - 1.5.2 Free field over a reflecting plane
    10 - 1.5.3 Anechoic room
    10 - 1.5.4 Hemi-anechoic room
    10 - 1.5.5 Surface sound pressure
    10 - 1.5.6 Surface sound pressure level
    10 - 1.5.7 Sound power level
    10 - 1.5.8 Frequency range of interest
    10 - 1.5.9 Measurement surface
    10 - 1.5.10 Far field
    10 - 1.5.11 Near field
    10 - 1.5.12 Volume of source under test
    11 - SECTION 2. TEST ROOM REQUIREMENTS
    11 - 2.1 GENERAL.
    11 - 2.1.1 Size.
    11 - 2.1.2 Criterion for room adequacy.
    11 - 2.1.3 Criterion for background noise.
    11 - 2.2 ROOM VOLUME.
    11 - 2.3 CRITERIA FOR TEMPERATURE AND HUMIDITY.
    11 - 2.4 CRITERIA FOR THE REFLECTING PLANE.
    12 - SECTION 3. INSTRUMENTATION
    12 - 3.1 GENERAL.
    12 - 3.2 THE MICROPHONE AND ITS ASSOCIATED CABLE
    12 - 3.3 FREQUENCY RESPONSE OF THE INSTRUMENTATION SYSTEM.
    12 - 3.4 WEIGHTING NETWORK, FREQUENCY ANALYSER.
    12 - 3.5 CALIBRATION.
    13 - SECTION 4. INSTALLATION AND OPERATION OF SOURCE
    13 - 4.1 GENERAL.
    13 - 4.2 INSTALLATION OF SOURCE.
    13 - 4.3 METHOD OF MOUNTING.
    13 - 4.4 CHOICE OF MOUNTING METHOD.
    13 - 4.5 AUXILIARY EQUIPMENT.
    13 - 4.6 OPERATION OF SOURCE DURING TEST.
    14 - SECTION 5. DETERMINATION OF MEAN-SQUARE PRESSURE
    14 - 5.1 GENERAL.
    14 - 5.2 MEASUREMENT SURFACE.
    14 - 5.2.1 Radius of test sphere.
    14 - 5.2.2 Radius of test hemisphere.
    14 - 5.3 MICROPHONE POSITIONS.
    14 - 5.3.1 General.
    14 - 5.3.2 Fixed microphone positions.
    14 - 5.3.3 Coaxial circular paths in parallel planes.
    15 - 5.3.4 Meridional arc traverses.
    15 - 5.4 CONDITIONS OF MEASUREMENT.
    15 - 5.4.1 General.
    15 - 5.4.2 Measurement with sound level meter.
    15 - 5.4.3 Measurementwith RC-smoothing or integrating systems.
    15 - 5.5 OBSERVATIONS TO BE OBTAINED.
    15 - 5.6 CORRECTION FOR BACKGROUND SOUND PRESSURE LEVELS.
    16 - 5.7 CALCULATION OF SURFACE SOUND PRESSURE LEVEL.
    16 - 5.7.1 General.
    16 - 5.7.2 Fixed microphone positions.
    16 - 5.7.3 Circular microphone traverses.
    16 - 5.7.4 Traverses along circular arcs.
    17 - SECTION 6. CALCULATION OF SOUND POWER LEVEL
    17 - 6.1 FREE FIELD.
    17 - 6.2 FREE FIELD OVER A REFLECTING PLANE.
    17 - 6.3 WEIGHTED SOUND POWER LEVEL AND BAND SOUND POWER LEVELS.
    18 - SECTION 7. INFORMATION TO BE RECORDED AND REPORTED
    18 - 7.1 INFORMATION TO BE RECORDED.
    18 - 7.1.1 General.
    18 - 7.1.2 Sound Source Under Test.
    18 - 7.1.3 Acoustic Environment.
    18 - 7.1.4 Acoustical Data.
    18 - 7.1.5 Instrumentation.
    18 - 7.2 INFORMATION TO BE REPORTED.
    19 - APPENDIX A - TEST ROOM QUALIFICATION PROCEDURES
    19 - A1 GENERAL.
    19 - A2 PROPERTIES OF REFLECTING PLANE.
    19 - A2.1 General.
    19 - A2.2 Shape and size.
    19 - A2.3 Absorption coefficient.
    19 - A3 SOUND PRESSURE DECREASE TEST.
    19 - A3.1 Instrumentation.
    19 - A3.2 Installation of test source and microphone.
    19 - A3.3 Test procedure.
    20 - A3.4 Qualification requirements.
    21 - APPENDIX B - RECOMMENDED ARRAY OF MICROPHONE POSITIONS IN A FREE FIELD
    23 - APPENDIX C- BASIC ARRAY OF MICROPHONE POSITIONS IN A FREE FIELD OVER A REFLECTING PLANE
    25 - APPENDIX D - COAXIAL CIRCULAR PATHS IN PARALLEL PLANES FOR MICROPHONE TRAVERSES IN A FREE FIELD OVER A REFLECTING PLANE
    26 - APPENDIX E - CALCULATION OF DIRECTIVITY INDEX AND DIRECTIVITY FACTOR
    26 - E1 FREE FIELD.
    26 - E2 FREE FIELD OVER A REFLECTING PLANE.
    27 - APPENDIX F - SYSTEM FOR MICROPHONE TRAVERSES ALONG MERIDIONAL PATHS IN A FREE FIELD
    28 - APPENDIX G - GUIDELINES FOR THE DESIGN OF TEST ROOMS
    28 - G1 GENERAL.
    28 - G2 VOLUME OF TEST ROOM.
    28 - G3 SHAPE OF TEST ROOM.
    28 - G4 ABSORPTION OF TEST ROOM.
    28 - G5 ABSORPTIVE TREATMENT.
    28 - G6 UNWANTED REFLECTIONS.
    28 - G7 SUSPENDED FLOOR CONSTRUCTION.
    28 - G8 BACKGROUND NOISE.
    28 - G9 AIR ABSORPTION.
    29 - APPENIDX H - EXAMPLES OF SUITABLE INSTRUMENTATION SYSTEMS
    29 - H1 GENERAL.
    29 - H2 RC-SMOOTHING, SOUND LEVEL METER.
    29 - H3 ANALOGUE INTEGRATORS.
    29 - H4 DIGITAL SYSTEMS.
    29 - H5 LEVEL RECORDERS.
    30 - APPENIDX J - GUIDELINES FOR THE DETECTION OF IMPULSIVE NOISE

    Abstract - (Show below) - (Hide below)

    Sets out two laboratory methods for determining the sound power radiated by a device, machine component or subassembly using a laboratory anechoic room having prescribed acoustical characteristics. Applies to sources which produce sound that is uniformly distributed in frequency over the frequency range of interest and is relatively steady for at least 30 s. Applies primarily to small sound sources, i.e. sources whose volumes are preferably less than 0.5 percent of the volume of the test room used for the measurements.

    Scope - (Show below) - (Hide below)

    This standard sets out in detail two laboratory methods for determining the sound power radiated by a device, machine, component or subassembly using a laboratory anechoic room having prescribedacoustical characteristics. While other methods could be used to measure the noise emitted by machinery and equipment, the methods specified in this standard are particularly useful for rating the sound output of sources which produce steady noise and for which directivity information on the source may be desired.The methods specified in this standard yield physical data that may be used for the following purposes:(a) Rating apparatus according to its sound power output.(b) Establishing sound control measures.(c) Predicting the sound pressure levels produced by a device in a given enclosure or environment. Techniques for utilizing the physical data for these special purposes are not included in this standard. The determination of the sound power radiated by a sound source in a completely free field or in a free field above a reflecting plane is based on the premise that the reverberant field produced by the source is negligible and that the total radiated power is obtained from the mean square sound pressure averaged in time and in space over a hypothetical sphere or hemisphere surrounding the source. The radius of the sphere or hemisphere is chosen so that its surface is in the far radiation field of the source.

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

    Committee AV-002
    Document Type Standard
    Publisher Standards Australia
    Status Withdrawn
    Supersedes

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

    AS Z41-1969 Octave, half octave and one-third octave band pass filters intended for the analysis of sound and vibrations
    AS 2533-2002 Acoustics - Preferred frequencies and band centre frequencies
    AS 1259-1982 Sound level meters
    AS 1217.7-1985 Acoustics - Determination of sound power levels of noise sources - Survey method
    AS 1217.5-1985 Acoustics - Determination of sound power levels of noise sources Engineering methods for free-field conditions over a reflecting plane
    AS 1217.1-1985 Acoustics - Determination of sound power levels of noise sources - Guidelines for the use of basic Standards for the preparation of noise test codes
    AS 1633-1985 Acoustics - Glossary of terms and related symbols
    AS 1217.2-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for broad-band sources in reverberation rooms
    AS 1217.4-1985 Acoustics - Determination of sound power levels of noise sources Engineering methods for special reverberation test room
    AS 1217.3-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for discrete-frequency and narrow-band sources in reverberation rooms

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

    AS 2938-1993 Gears - Spur and helical - Guide to specification and rating
    AS 1217.2-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for broad-band sources in reverberation rooms
    AS 2991.2-1991 Acoustics - Method for the determination of airborne noise emitted by household and similar electrical appliances Particular requirements for dishwashers
    AS 3755-1990 Acoustics - Measurement of airborne noise emitted by computer and business equipment
    AS 1217.1-1985 Acoustics - Determination of sound power levels of noise sources - Guidelines for the use of basic Standards for the preparation of noise test codes
    AS 3781-1990 Acoustics - Noise labelling of machinery and equipment
    AS 1217.5-1985 Acoustics - Determination of sound power levels of noise sources Engineering methods for free-field conditions over a reflecting plane
    AS 2913-2000 Evaporative airconditioning equipment (Reconfirmed 2016)
    AS 3007.3-2004 Electrical installations - Surface mines and associated processing plant - General requirements for equipment and ancillaries
    AS 2991.1-1987 Acoustics - Method for the determination of airborne noise emitted by household and similar electrical appliances - General requirements
    AS 1217.7-1985 Acoustics - Determination of sound power levels of noise sources - Survey method
    AS 5102.1-2009 Performance of household electrical appliances - Swimming pool pump-units Energy consumption and performance
    AS 3782.3-1990 Acoustics - Statistical methods for determining and verifying stated noise emission values of machinery and equipment Simple (transition) method for stated values for batches of machines
    AS 3782.2-1990 Acoustics - Statistical methods for determining and verifying stated noise emission values of machinery and equipment Methods for stated values for individual machines
    AS 2659.1-1988 Guide to the use of sound measuring equipment - Portable sound level meters
    AS 3782.1-1990 Acoustics - Statistical methods for determining and verifying stated noise emission values of machinery and equipment General considerations and definitions
    AS 1081.2-1990 Acoustics - Measurements of airborne noise emitted by rotating electrical machinery Survey method
    AS 1359.109-1998 Rotating electrical machines - General requirements - Noise limits
    AS 1217.3-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for discrete-frequency and narrow-band sources in reverberation rooms
    AS 3544-1988 Industrial vacuum cleaners for particulates hazardous to health
    AS 1217.4-1985 Acoustics - Determination of sound power levels of noise sources Engineering methods for special reverberation test room
    AS 1081.1-1990 Acoustics - Measurement of airborne noise emitted by rotating electrical machinery Engineering method for free-field conditions over a reflective plane
    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective