TCVN 9799:2013 - Acoustics - Determination of occupational noise exposure - Engineering method

1. Scope

This standard specifies technical measurement methods for worker noise exposure in the working environment and for calculating noise exposure levels. This standard addresses A-weighted sound levels but can also be applied to C-weighted sound levels. This standard specifies three different measurement methods. This method is useful when it is necessary to determine noise exposure levels to a technical degree, for example, detailed studies of noise exposure, or epidemiological studies on hearing impairment or other adverse effects.

The measurement process requires observation and analysis of noise exposure conditions so that the quality of the measurement can be controlled. This standard provides a method for estimating the measurement uncertainty.

This standard is not intended for evaluating speech masking or for evaluating ultrasound, infrasound, and non-acoustic effects of noise. This standard does not apply to measurements of ear noise exposure levels when wearing hearing protection devices.

The results of measurements performed according to this standard can provide useful information when determining priorities for noise control measures.

2. Normative references

The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

TCVN 9595-3 (ISO/IEC Guide 98-3), Uncertainty of measurement – Part 3: Guide to the expression of uncertainty in measurement (GUM:1995).

ISO 1999, Acoustics – Determination of occupational noise exposure and estimation of noise-induced hearing impairment ("Acoustics – Determination of occupational noise exposure and estimation of noise-induced hearing impairment”.)

IEC 60942: 2003, Electroacoustics – Sound calibrators (Electroacoustics – Sound calibrators).

IEC 61252, Electroacoustics – Specifications for personal sound exposure meters (Electroacoustics – Specifications for personal sound exposure meters).

IEC 61672-1:2002, Electroacoustics – Sound level meters – Part 1: Specifications (Electroacoustics – Sound level meters – Part 1: Specifications).