AS 2991.1-1987

1 - AS 2991.1-1987 ACOUSTICS - METHOD FOR THE DETERMINATION OF AIRBORNE NOISE EMITTED BY HOUSEHOLD AND SIMILAR ELECTRICAL APPLIAN
4 - PREFACE
5 - CONTENTS
7 - FOREWORD
8 - SECTION 1. SCOPE AND GENERAL
8 - 1.1 SCOPE.
8 - 1.2 APPLICATION.
8 - 1.3 REFERENCED DOCUMENTS.
9 - 1.4 DEFINITIONS.
9 - 1.4.1 Direct method
9 - 1.4.2 Comparison method
9 - 1.4.3 Period of observation
9 - 1.4.4 Operational cycle
9 - 1.4.5 Time history
9 - 1.4.6 Standards test operator
9 - 1.4.7 Centre of location or position of a source
10 - SECTION 2. MEASUREMENT METHODS AND ACOUSTICAL ENVIRONMENTS
10 - 2.1 GENERAL.
10 - 2.2 MEASUREMENT METHODS.
10 - 2.2.1 Direct method.
10 - 2.2.2 Comparison method.
10 - 2.3 ACOUSTICAL ENVIRONMENTS.
10 - 2.3.1 Free-field conditions over reflecting plane(s).
10 - 2.3.2 Special reverberation rooms.
11 - SECTION 3. INSTRUMENTATION
11 - 3.1 INSTRUMENTATION FOR MEASURING ACOUSTICAL DATA
11 - 3.2 INSTRUMENTATION FOR MEASURING CLIMATIC CONDITIONS
11 - 3.3 INSTRUMENTATION FOR MEASURING OPERATING CONDITIONS
12 - SECTION 4. OPERATION AND LOCATION OF APPLIANCES UNDER TEST
12 - 4.1 EQUIPPING, PRECONDITIONING AND INSTALLATION OF APPLIANCES
12 - 4.2 SUPPLY OF ELECTRIC ENERGY, WATER, OR GAS
12 - 4.3 CLIMATIC CONDITIONS.
12 - 4.4 LOADING AND OPERATING OF APPLIANCES
12 - 4.5 LOCATION AND MOUNTING OF APPLIANCES.
12 - 4.5.1 Counter-top or table-type appliances and floor-standing appliances
13 - 4.5.2 Hand-held appliances.
13 - 4.5.3 Floor-standing appliances for placement against a wall
13 - 4.5.4 Wall-mounted appliances.
13 - 4.5.5 Built-in appliances.
13 - 4.5.6 Stand-supported appliances.
13 - 4.5.7 Floor-treatment appliances.
14 - SECTION 5. MEASUREMENT OF NOISE LEVELS
14 - 5.1 GENERAL.
14 - 5.2 MICROPHONE ARRAY AND MEASUREMENT SURFACE FOR ESSENTIALLY FREE-FIELD CONDITIONS OVER A REFLECTING PLANE.
14 - 5.2.1 General.
14 - 5.2.2 Floor-standing free-standing appliances.
15 - 5.2.3 Floor-standing or counter-type appliances placed against a wall
15 - 5.2.4 Floor-standing cabinet-type appliances.
16 - 5.2.4 Bench-top table-type, floor-treatment, and hand held appliances
17 - 5.2.5 Bench-top, table-type and hand-held appliances
18 - 5.2.6 Small floor-standing appliances.
19 - 5.2.7 Stand-type appliances.
21 - 5.3 MICROPHONE ARRAY AND LOCATION OF REFERENCE SOUND SOURCE IN FREE-FIELD CONDITIONS
21 - 5.4 MICROPHONE ARRAY AND SOURCE LOCATION IN SPECIAL REVERBERANT TEST ROOMS.
21 - 5.4.1 General.
21 - 5.4.2 Fixed microphone arrays.
21 - 5.4.3 Space averaging measurement microphone procedures
21 - 5.5 MICROPHONE ARRAY AND LOCATION OF REFERENCE SOUND SOURCE IN REBEVERBERMENT FIELD CONDITIONS
21 - 5.6 SOUND PRESSURE LEVEL MEASUREMENTS.
23 - SECTION 6. CALCULATION OF SOUND PRESSURE AND SOUND POWER LEVELS
23 - 6.1 GENERAL.
23 - 6.2 CALCULATION OF MEAN SOUND PRESSURE LEVELS
23 - 6.3 CALCULATION OF SOUND POWER LEVELS FOR THE COMPARISON METHOD.
23 - 6.4 CALCULATION OF SOUND POWER LEVELS FOR MEASUREMENTS WITH THE DIRECT METHOD IN QUALIFIED FREE-FIELD CONDITIONS IN ACCORDAN
23 - 6.5 CALCULATION OF A- WEIGHTED SOUND POWER LEVELS FOR MEASUREMENTSWITH THE DIRECT METHOD IN SPECIAL REVERBERATION TEST ROOMS IN
25 - SECTION 7. INFORMATION TO BE RECORDED
25 - 7.1 GENERAL DATA.
25 - 7.2 DESCRIPTION OF THE APPLIANCE UNDER TEST.
25 - 7.3 MEASUREMENT METHOD
25 - 7.4 ACOUSTICAL TEST ENVIRONMENT.
25 - 7.5 INSTRUMENTATION
25 - 7.6 EQUIPMENT AND PRECONDITIONING OF APPLIANCE UNDER TEST
25 - 7.7 ELECTRIC SUPPLY, WATERSUPPLY, ETC
25 - 7.8 CLIMATIC CONDITIONS
25 - 7.9 OPERATION OF THE APPLIANCE UNDER TEST
25 - 7.10 LOCATION AND MOUNTING OF THE APPLIANCE UNDER TEST
25 - 7.11 MEASUREMENT DATA
26 - 7.12 CALCULATED SOUND PRESSURE AND SOUND POWER LEVELS
26 - APPENDIX A GUIDELINES FOR THE DESIGN OF SIMPLE TEST ROOMS WITH ESSENTIALLY FREE-FIELD CONDITIONS

Sets out objective methods of engineering accuracy for determining sound power levels of airborne acoustical noise emitted by household and similar appliances within the specified frequency range of interest. The Standard does not apply to industrial or professional equipment and equipment which is part of a building or its installations.

This Standard sets out objective methods of engineering accuracy (engineering method, grade 2 according to ISO 2204) for determining sound power levels of airborne acoustical noise emitted by household and similar appliances within the specified frequency range of interest. This Standard does not apply to the following:(a) Appliances, equipment, or machines designed primarily for industrial or professional purposes.(b) Appliances which are integrated parts of a building or its installations such as equipment for air conditioning, heating, and ventilating (except household fans, cooker hoods, and free-standing heating appliances), oil burners for central heating, pumps for water supply, macerators, and pumps for sewerage systems.(c) Separate motors or generators.(d) Appliances intended specifically for outdoor use. Not included in this Standard are methods for determining sound power levels with greater precision accuracy (precision method, grade 1 according to ISO 2204) specified for example in AS 1217.2, AS 1217.3, and AS 1217.6. They may, however, be applied if the appropriate instrumentation and test environment are available.