This Nordtest method specifies an engineering method for determination of occupational noise exposure at work places. The method contains different approaches for carrying out the measurements.
The resulting noise exposure is determined from a combination of data from noise measurements, recordings of working procedures and operations, time intervals (duration) and calculations for typical time segments of a nominal working day.
The daily noise exposure normalised to a nominal working day is determined by summing the contributions from the typical work operations. Simplified measurements with survey grade of accuracy are described in NT ACOU 114.
The measurements in ear canal and use of miniature microphones are described in EN-ISO 11904-1. For manikin measurements, see EN-ISO 11904-2. This Nordtest method does not specify measurements for work places having low noise levels.