ISO 5130-2019 声学--由固定道路车辆发出的声压级的测量 Acoustics -- Measurements of sound pressure level emitted by stationary road vehicles<br /> 

This document specifies a test procedure, environment and instrumentation for measuring the exterior 
sound pressure levels from road vehicles under stationary conditions, providing a continuous measure 
of the sound pressure level over a range of engine speeds.
This document applies only to road vehicles of categories L, M, and N equipped with internal combustion 
engines. Vehicles where an internal combustion engine cannot operate when the vehicle is at stationary 
conditions are outside the scope of this document.
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.
It is within the scope of this document to measure the stationary A-weighted sound pressure level during
— type approval measurements of vehicle;
— measurements at the manufacturing stage;
— measurements at official testing stations;
— measurements at roadside testing.
This document specifices a test method to determine a reference sound level which is unique for the 
vehicle and therefore not suitable to compare against a general limit, as test condition, microphone 
condition location relative to the sound sources can vary significantly. The test conditions in proximity 
and at engine speeds significantly higher compared to real operation conditions in traffic are 
deliberately chosen to enable in-use tests at higher background conditions, which are typical for road-
side checks.
Technical background information is given in Annex A.rd edition 2019-07 Acoustics — Measurements of sound pressure level emitted by stationary road vehicles Acoustique — Mesurages du niveau de pression acoustique émis par les véhicules routiers en stationnement Reference number ISO 5130:2019(E) ？ ISO 2019 ISO 5130:2019(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2019 All rights reserved. Unless otherwise spe