BS EN ISO 9612:2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Instrumentation
6 Methodology - Chronological steps
7 Work analysis
8 Selection of measurement strategies
9 Strategy 1 - Task-based measurement
10 Strategy 2 - Job-based measurement
11 Strategy 3 - Full-day measurement
12 Measurements
13 Sources of uncertainty
14 Calculation of measurement uncertainties and
   presentation of the final results
15 Information to be reported
Annex A (informative) - Example of a checklist to ensure that
        significant noise events are detected during the
        work analysis
Annex B (informative) - Guide to the selection of
        measurement strategy
Annex C (normative) - Evaluation of measurement
        uncertainties
Annex D (informative) - An example showing calculation of
        daily noise exposure level using task-based
        measurements
Annex E (informative) - An example showing calculation of
        daily noise exposure level using job-based
        measurements
Annex F (informative) - Sample calculation of daily noise
        exposure level using full-day measurements
Bibliography

Describes an engineering method for measuring workers' exposure to noise in a working environment and calculating the noise exposure level.

This International Standard specifies an engineering method for measuring workers’ exposure to noise in a working environment and calculating the noise exposure level. This International Standard deals with A-weighted levels but is applicable also to C-weighted levels. Three different strategies for measurement are specified. The method is useful where a determination of noise exposure to engineering grade is required, e.g. for detailed noise exposure studies or epidemiological studies of hearing damage or other adverse effects.

The measuring process requires observation and analysis of the noise exposure conditions so that the quality of the measurements can be controlled. This International Standard provides methods for estimating the uncertainty of the results.

This International Standard is not intended for assessment of masking of oral communication or assessment of infrasound, ultrasound and non-auditory effects of noise. It does not apply to the measurement of the noise exposure of the ear when hearing protectors are worn.

Results of the measurements performed in accordance with this International Standard can provide useful information when defining priorities for noise control measures.