NEN EN ISO 11205 : 2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement uncertainty
5 Principle
6 Instrumentation
   6.1 General
   6.2 Calibration
7 Installation and operation of the source
   7.1 General
   7.2 Location of the machine
   7.3 Mounting of the machine
   7.4 Auxiliary equipment
   7.5 Operation of the machine under test
8 Test procedure
   8.1 Applicability
   8.2 Measurement time interval
   8.3 Measurements
   8.4 Wind and gas flows
   8.5 Criteria for qualification of the measurement
   8.6 Criterion for background noise
   8.7 Frequency range of measurements
   8.8 Evaluation of the measurement result
9 Information to be recorded
   9.1 General
   9.2 Machine under test
   9.3 Test conditions
   9.4 Acoustic environment
   9.5 Instrumentation
   9.6 Location of specified positions
   9.7 Noise data
10 Information to be reported
Annex A (normative) Criterion for the adequacy of the direction
        of the sound intensity vector
Annex B (normative) Procedure for frequencies higher than 5 000 Hz
Annex C (normative) Procedure in case the measurement fails to
        qualify
Annex D (informative) Example of a test table
Bibliography

Describes an engineering method (grade 2 accuracy) to determine the emission sound pressure level of machines in situ, at the work station or at other specified positions, using sound intensity. It is an alternative to ISO 11201, ISO 11202 and ISO 11204 for in situ measurements.