AS 3757-1990

1 - AS 3757-1990 ACOUSTICS-DECLARED NOISE EMISSION VALUES OF COMPUTER AND BUSINESS EQUIPMENT
4 - PREFACE
4 - CONTENTS
5 - 0 Introduction
5 - 1 Scope and field of application
6 - 2 References
6 - 3 Definitions
6 - 3.1 General definitions
6 - 3.1.1 computer and business equipment:
6 - 3.1.2 batch [lot] of equipment:
6 - 3.1.3 idling mode:
6 - 3.1.4 operating mode:
6 - 3.2 Acoustical definitions
6 - 3.2.1 A-weighted sound power level,
6 - 3.2.2 A-weighted sound pressure level,
6 - 3.2.3 measured value:
6 - 3.2.4 declared noise emission values:
6 - 3.2.5 declared A-weighted sound power level
6 - 3.2.6 declared A-weighted sound pressure level,
7 - 3.3 Statistical definitions
7 - 3.3.1 standard deviation of repeatability,
7 - 3.3.2 standard deviation of reproducibility,
7 - 3.3.3 standard deviation of production,
7 - 3.3.4 total standard deviation,
7 - 3.3.5 reference standard deviation,
7 - 4 Determination of the declared noise emission values
7 - 4.1 General
7 - 4.2 Determination of the A-weighted sound power level
7 - 4.3 Measurement of the A-weighted sound pressure level, at the operator (bystander) position(s)
7 - 4.4 Determination of the declared noise emission values
7 - 4.4.1 Determination of the declared A-weighted sound power level, for batches of machines
8 - 4.4.2 Determination of the declared A-weighted sound power level, for an individual machine
8 - 4.4.3 Determination of the declared A-weighted sound pressure level, for batches of machines
8 - 4.4.4 Determination of the declared A-weighted sound pressure level, for an individual machine
8 - 5 Presenting declared noise emission values
8 - 6 Verification of the declared noise emission values
8 - 6.1 General
9 - 6.2 Verification of the values of LWAd for a batch of machines
9 - 6.3 Verification of the values of LWAd for an individual machine
10 - Annex A - Examples of noise emission declarations
11 - Annex B - Character of noise
11 - B.1 General
11 - B.2 Determination of the character of noise
11 - B.3 Information on impulsive noise and prominent discrete tones