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BS ISO 9296:2017

Current
Current

The latest, up-to-date edition.

Acoustics. Declared noise emission values of information technology and telecommunications equipment
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

09-18-2017

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Conformity requirements
5 Determination of the noise emission values to
  declare
6 Presentation of declared noise emission values
7 Verification of the statistical upper limit A-weighted
  sound power level, L[WA,c]
Annex A (normative) - Procedure for determining the
        statistical adder for verification, K[V]
Annex B (informative) - Examples of noise emission
        declarations
Annex C (informative) - Character of noise
Bibliography

Pertains to information technology and telecommunications equipment.

This document is applicable to information technology and telecommunications equipment. It specifies: for a batch of equipment, the method for determining the following values: the declared mean A-weighted sound power level, LW A,m; the declared mean A-weighted emission sound pressure level, Lp A,m; the statistical adder for verification, Kv; the statistical upper limit A-weighted sound power level, LW A,c; how acoustical and product information is to be published electronically or in hard-copy format in technical documents or other product literature supplied to users by the manufacturer or declarer; the method for verifying the noise emission values that are declared by the manufacturer or declarer. NOTE The terms “manufacturer?? and “declarer?? are used in this document to represent any entity that provides product noise emission information. For instance, a product supplier or importer who does not manufacture the hardware, but offers noise emissions information, is also referred to a manufacturer or a declarer as applicable, in this document. The uniform methods in this document use the noise emission data obtained in accordance with ISO7779, and the declaration and verification procedures detailed in ISO4871[4] and ISO7574‑4.[6] The basic noise emission values to be declared are the declared mean A-weighted sound power levels, LW A,m. Optionally, the declared mean A-weighted emission sound pressure levels at the operator or bystander positions, Lp A,m, can be declared. These are arithmetic mean values based upon measurements on a random sample of equipment of the batch, in accordance with ISO7779. For verification purposes, an additional quantity is required to be declared: the statistical adder for verification, Kv. This is a quantity that is added to the declared mean A-weighted sound power level, LW A,m, and used in the verification section of this document to provide a consistent and predictable probability of acceptance for the batch of equipment. The declared mean A-weighted sound power level for the batch of equipment permits comparison of noise emissions between different products and permits predictions of installation or work-place noise immission levels, as described in ECMATR/27.[9] Although the most useful quantity for calculating immission levels due to one or more noise sources is the A-weighted sound power level of the individual source(s), the A-weighted emission sound pressure level may also be useful in estimating the immission level in the immediate vicinity of an isolated piece of equipment. To avoid confusion between sound power levels and emission sound pressure levels, the declared mean A-weighted sound power level, LW A,m, is expressed in bels (B) and the declared mean A-weighted emission sound pressure level, Lp A,m, is expressed in decibels (dB).

Committee
EH/1/4
DevelopmentNote
Supersedes 14/30291684 DC & BS 7135-3(1989). (10/2017)
DocumentType
Standard
Pages
26
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
ISO 9296:2017 Identical

ISO 4871:1996 Acoustics — Declaration and verification of noise emission values of machinery and equipment
ISO 3744:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering methods for an essentially free field over a reflecting plane
ISO 7574-4:1985 Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 4: Methods for stated values for batches of machines
ISO 7574-1:1985 Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 1: General considerations and definitions
ISO 3741:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for reverberation test rooms
ISO 3745:2012 Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for anechoic rooms and hemi-anechoic rooms
ECMA/TR 27 : 2ED 95 METHOD FOR THE PREDICTION OF INSTALLATION NOISE LEVELS
ISO 11201:2010 Acoustics Noise emitted by machinery and equipment Determination of emission sound pressure levels at a work station and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections
ISO 7779:2010 Acoustics Measurement of airborne noise emitted by information technology and telecommunications equipment
ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)

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