ECMA 160 : 2ED 92

1 General
   1.1 Scope
   1.2 Field of Application
   1.3 Character of noise radiated by the source
   1.4 Measurement uncertainty
2 Conformance
3 References
4 Definitions
   4.1 Dynamic capability index, L[d]
   4.2 Field indicators F[+/-] and F[pl]
   4.3 Measurement distance
   4.4 Measurement surface
   4.5 Measurement segment
   4.6 Probe
   4.7 Pressure-residual intensity index, delta[PI[0]]
   4.8 Scan
   4.9 Sound Intensity
   4.10 Scan
   4.11 Sound pressure
   4.12 Stationary signal
5 Acoustical environment
   5.1 Criterion for adequacy of the environment
   5.2 Extraneous intensity
   5.3 Wind, gas flows, vibration and temperature
   5.4 Configuration of the surroundings
6 Instrumentation
   6.1 General
   6.2 Calibration and field check
7 Installation and operation of equipment under test
   7.1 General
   7.2 Installation of equipment
   7.3 Equipment operation
8 Measurement of normal sound intensity component levels
   8.1 The scan
   8.2 The initial measurement surface
   8.3 Initial test
9 Calculation of sound power levels
   9.1 Calculation of partial sound powers for each segment
        of the measurement surface
   9.2 Calculation of sound power level of the equipment
        under test
   9.3 Calculation of A-weighted sound power level of equipment
        under test
10 Information to be recorded
   10.1 General
   10.2 Equipment under test
   10.3 Acoustic environment
   10.4 Instrumentation
   10.5 Measurement procedure
   10.6 Acoustical data
   10.7 Conformance to this Standard
11 Information to be reported
Annex A - Calculation of field indicators
Annex B - Procedure for achieving desired grade of accuracy
Annex C - The effects of airflow on measurement of sound
          intensity
Annex D - The effect of sound absorption within the
          measurement surface
Annex E - Measurement surface and scanning procedure
Annex F - Determination of sound power levels using L[W[I[i]]]
          and L[I[n[i]]]
Annex G - Main differences between the second and the first
          editions
Annex H - Main differences between ISO 9614-2 and ECMA-160

Specifies a procedure for the determination of sound power levels of computers and business equipment under its normal operating conditions (see ECMA-74), by using sound intensity measurements in rooms other than dedicated acoustical laboratories.