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

Applies to computer and business equipment. Specifies the method for determining the declared noise emission values, acoustical and product information to be supplied to users by the manufacturer and the method for verifying the declared noise emission values given by the manufacturer. Identical with and reproduced from ISO 9296.

This International Standard applies to computer and business equipment.This International Standard specifies- the method for determining the declared noise emission values;- acoustical and product information to be given in technical documents supplied to users by the manufacturer;- the method for verifying the declared noise emission values given by the manufacturers.The uniform methods in this International Standard use the noise data obtained in accordance with ISO 7779 and the procedures specified in ISO 4871 and ISO 7574.The basic declared noise emission values are the declared A-weighted sound power level, (a LWAdstatistical maximum value corresponding to Lc in ISO 7574), and the declared A-weighted sound pressure level, at the LpAm (a mean value), operator or bystander positions.