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Measurement of noise emitted by accelerating road vehicles — Engineering method — Part 1: M and N categories
The specifications are intended to reproduce the level of noise generated by the principal noise sources during normal driving in urban traffic.
The method is designed to meet the requirements of simplicity as far as they are consistent with reproducibility of results under the operating conditions of the vehicle.
The test method requires an acoustical environment that is only obtained in an extensive open space. Such conditions are usually provided for type approval measurements of a vehicle, measurements at the manufacturing stage, and measurements at official testing stations.
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