NS EN ISO 7779 : 1ED 2010

1 Scope
2 Normative references
3 Terms and definitions
  3.1 General definitions
  3.2 Acoustical definitions
4 Requirements
5 Installation and operating conditions
  5.1 Equipment installation
  5.2 Input voltage and frequency
  5.3 Equipment operation
6 Method for determining sound power levels of
  equipment in reverberation rooms
  6.1 General
  6.2 Measurement uncertainty
  6.3 Test environment
  6.4 Instrumentation
  6.5 Installation and operation of equipment:
      General requirements
  6.6 Microphone positions and source locations
  6.7 Measurement of sound pressure level
  6.8 Measurement of the sound pressure level
      of the reference sound source
  6.9 Calculation of space/time-averaged band
      sound pressure level
  6.10 Calculation of sound power levels
7 Method for determining sound power levels of
  equipment under essentially free-field conditions over
  a reflecting plane
  7.1 General
  7.2 Measurement uncertainty
  7.3 Test environment
  7.4 Instrumentation
  7.5 Installation and operation of equipment:
      General requirement
  7.6 Measurement surface and microphone positions
  7.7 Measurement of sound pressure levels
  7.8 Calculation of surface sound pressure level
      sound power level
8 Method for measuring emission sound pressure levels
  at defined operator and bystander positions
  8.1 General
  8.2 Measurement uncertainty
  8.3 Test environment
  8.4 Instrumentation
  8.5 Installation and operation of equipment
  8.6 Microphone positions
  8.7 Measurement of sound pressure levels
  8.8 Calculation of the mean emission sound pressure
      level at the bystander positions
9 Information to be recorded and reported
  9.1 Information to be recorded
  9.2 Test report
Annex A (normative) Test accessories
Annex B (normative) Measurement surfaces
Annex C (normative) Installation and operating conditions
        for specific equipment categories
Annex D (informative) Identification of prominent
        discrete tones
Annex E (informative) Detection of impulsive sound
        pressure levels
Bibliography

Defines procedures for reporting and measuring the noise emission of information technology and telecommunications equipment. This standard is considered part of a noise test code for this type of equipment, and is based on basic noise emission standards ISO 3741, ISO 3744, ISO 3745 and ISO 11201. The basic emission quality is the A-weighted sound power level which may be used for comparing equipment of the same type but from different manufacturers, or for comparing different equipment.