NF EN ISO 9295

NF EN ISO 9295

July 2015
Standard Current

Acoustics - Determination of high-frequency sound power levels emitted by machinery and equipment

ISO 9295:2015 specifies four methods for the determination of the sound power levels of high-frequency noise emitted by machinery and equipment in the frequency range covered by the octave band centred at 16 kHz, which includes frequencies between 11,2 kHz and 22,4 kHz. They are complementary to the methods described in ISO 3741 and ISO 3744. The first three methods are based on the reverberation test room technique. The fourth method makes use of a free field over a reflecting plane. The test conditions which prescribe the installation and operation of the equipment are those specified in ISO 3741 or ISO 3744 as applicable.

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Main informations

Collections

National standards and national normative documents

Publication date

July 2015

Number of pages

26 p.

Reference

NF EN ISO 9295

ICS Codes

17.140.20   Noise emitted by machines and equipment
35.020   Information technology (IT) in general

Classification index

S31-111

Print number

1

International kinship

ISO 9295:2015

European kinship

EN ISO 9295:2015
Sumary
Acoustics - Determination of high-frequency sound power levels emitted by machinery and equipment

ISO 9295:2015 specifies four methods for the determination of the sound power levels of high-frequency noise emitted by machinery and equipment in the frequency range covered by the octave band centred at 16 kHz, which includes frequencies between 11,2 kHz and 22,4 kHz. They are complementary to the methods described in ISO 3741 and ISO 3744. The first three methods are based on the reverberation test room technique. The fourth method makes use of a free field over a reflecting plane.

The test conditions which prescribe the installation and operation of the equipment are those specified in ISO 3741 or ISO 3744 as applicable.

Replaced standards (1)
NF EN 29295
February 1992
Standard Cancelled
Acoustics. Measurement of high-frequency noise emitted by computer and business equipment.

Table of contents
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  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Exigences de conformité
  • 5 Exigences concernant les mesurages en salle d'essai réverbérante
  • 6 Méthode reposant sur la durée de réverbération mesurée
  • 7 Méthode reposant sur le calcul de l'absorption par l'air
  • 8 Méthode utilisant une source sonore de référence
  • 9 Méthode en champ libre au-dessus d'un plan réfléchissant
  • 10 Calcul du niveau de puissance acoustique dans les conditions météorologiques de référence
  • 11 Incertitude de mesure
  • 12 Informations à enregistrer
  • 13 Informations à consigner dans le rapport
  • Annexe A Calcul du coefficient d'absorption par l'air
  • Bibliographie
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