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AS 1217.2-1985

Withdrawn

Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.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

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Withdrawn date

06-30-2017

Published date

04-04-1985

Preview

1 - AS 1217.2-1985 ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS OF NOISE SOURCES - PRECISION METHODS FOR BROAD-BAND SOURCES I
4 - PREFACE
5 - CONTENTS
6 - FOREWORD
7 - SYNOPSIS
8 - SECTION 1. SCOPE AND GENERAL
8 - 1.1 SCOPE.
8 - 1.2 FIELD OF APPLICATION.
8 - 1.2.1 Types of noise.
8 - 1.2.2 Size of source.
8 - 1.3 REFERENCED DOCUMENTS.
8 - 1. 4 MEASUREMENT UNCERTAINTY.
8 - 1.5 DEFINITIONS.
8 - 1.5.1 Reverberation room
8 - 1.5.2 Reverberant sound field
8 - 1.5.3 Mean-square sound pressure
8 - 1.5.4 Sound pressure level
8 - 1.5.5 Sound power level
9 - 1.5.6 Frequency range of interest
9 - 1.5.7 Direct method
9 - 1.5.8 Comparison method
10 - SECTION 2. TEST ROOM REQUIREMENTS
10 - 2.1 GENERAL.
10 - 2.2 ROOM VOLUME.
10 - 2.3 ROOM ABSORPTION.
10 - 2.3.1 General.
10 - 2.3.2 Minimum distance.
10 - 2.3.3 Surface treatment.
10 - 2.4 CRITERION FOR ROOM ADEQUACY.
10 - 2.5 CRITERION FOR BACKGROUND NOISE LEVEL.
10 - 2.6 CRITERIA FOR TEMPERATURE AND HUMIDITY.
11 - SECTION 3. INSTRUMENTATION
11 - 3.1 GENERAL.
11 - 3.2 INDICATING DEVICE.
11 - 3.2.1 General.
11 - 3.2.2 Integration over a fixed time interval.
11 - 3.2.3 Continuous averaging.
11 - 3.3 THE MICROPHONE AND ITS ASSOCIATED CABLE.
11 - 3.4 FREQUENCY RESPONSE OF THE INSTRUMENTATION SYSTEM.
11 - 3.5 FILTER CHARACTERISTICS.
11 - 3.6 CALIBRATION.
12 - SECTION 4. INSTALLATION AND OPERATION OF SOURCE
12 - 4.1 GENERAL.
12 - 4.2 SOURCE POSITION.
12 - 4.3 SOURCE MOUNTING.
12 - 4.4 AUXILIARY EQUIPMENT.
12 - 4. 5 OPERATION OF SOURCE DURING MEASUREMENTS.
13 - SECTION 5. MEASUREMENT OF MEAN-SQUARE SOUND PRESSURE
13 - 5.1 MICROPHONE POSITIONS.
13 - 5.1.1 General.
13 - 5.1.2 Repetition rate.
13 - 5.1.3 Microphone traverse or array.
13 - 5.2 REQUIRED DATA AND CONDITIONS OF MEASUREMENT.
13 - 5.2.1 Sound pressure level readings.
13 - 5.2.2 Period of observation.
13 - 5.2.3 Correction for background sound pressure levels.
13 - 5.2.4 Calculation of mean band pressure levels.
14 - SECTION 6. CALCULATION OF SOUND POWER LEVEL
14 - 6.1 GENERAL.
14 - 6.2 DIRECT METHOD (METHOD I).
14 - 6.2.1 Additional data required.
14 - 6.2.2 Calculation procedure.
14 - 6.3 COMPARISON METHOD (METHOD II).
14 - 6.3.1 General.
14 - 6.3.2 Location of the reference sound source.
14 - 6.3.3 Required additional data.
14 - 6.3.4 Calculation procedure.
15 - SECTION 7. INFORMATION TO BE RECORDED AND REPORTED
15 - 7.1 INFORMATION TO BE RECORDED.
15 - 7.1.1 General.
15 - 7.1.2 Sound source under test.
15 - 7.1.3 Acoustic environment.
15 - 7.1.4 Instrumentation.
15 - 7.1.5 Acoustical data.
15 - 7.2 INFORMATION TO BE REPORTED.
16 - APPENDIX A - TEST ROOM QUALIFICATION PROCEDURE FOR THE MEASUREMENT OF BROAD-BAND SOUND
16 - A1 INTRODUCTION.
16 - A2 INSTRUMENTATION AND EQUIPMENT.
16 - A3 TEST PROCEDURE.
16 - A4 COMPUTATION PROCEDURE.
16 - A5 QUALIFICATION.
17 - APPENDIX B - CHARACTERISTICS AND CALIBRATION OF REFERENCE SOUND SOURCE
17 - B1 CHARACTERISTICS OF REFERENCE SOUND SOURCE.
17 - B2 CALIBRATION OF REFERENCE SOUND SOURCE.
18 - APPENDIX C - COMPUTATIONAL PROCEDURES FOR CALCULATING A- WEIGHTED SOUND POWER LEVEL FROM OCTAVE OR ONE-THIRD OCTAVE BAND POW
19 - APPENDIX D - GUIDELINES FOR THE DESIGN OF REVERBERATION ROOMS
19 - D1 GENERAL.
19 - D2 VOLUME OF TEST ROOM.
19 - D3 SHAPE OF TEST ROOM AND DIFFUSING ELEMENTS.
19 - D4 ABSORPTION OF TEST ROOM.

Sets out a direct method and a comparison method for determining the sound power level produced by a source. Specifies test room requirements, source location and operating conditions, instrumentation and techniques for obtaining an estimate of mean-square sound pressure from which the power sound level of the source in octave or one-third octave bands is calculated. Applies primarily to sources which produce steady broad-band noise.

This standard sets out a direct method and a comparison method for determining the sound power level produced by a source. It specifies test room requirements, source location and operating conditions, instrumentation and techniques for obtaining an estimate of mean-square sound pressure from which the sound power level of the source in octave or one-third octave bands is calculated.FIELD OF

Committee
AV-002
DocumentType
Standard
ISBN
0 7262 3590 3
Pages
12
PublisherName
Standards Australia
Status
Withdrawn
Supersedes

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