1 Scope
This document specifies an engineering method for measuring the interior sound of
road vehicles of categories M and N under typical driving conditions. It does not
apply to agricultural tractors and field machinery.
It specifies the conditions for obtaining reproducible and comparable measurements
of sound pressure levels inside a vehicle.
These measurements are used to obtain a representative average sound level during
a typical driving cycle to enable assessment of adverse effects on human health.
The results can be used for
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— standardized assessment of interior sound for comparisons (e.g. benchmark, consumer information programs),
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— verification tests, to decide whether or not the sound inside the vehicle is in accordance with specifications,
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— regulatory purposes, for example for evaluation of sound in relation to labour or for general health standards, and
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— monitoring tests, in order to check that the sound inside the vehicles has not changed since delivery, or between individual units of a consignment of vehicles.
This document does evaluate the exposure to interior sound of vehicles in a way as
it is commonly used for scientific effects on human health.
It does not assess maximum interior sound of a vehicle under extreme driving situations,
as today’s measured maximum sound pressure levels inside vehicles are far away from
the risk to create instantaneous hearing damages.