本文件规定了测量外部环境的试验程序、环境和仪器 静止条件下道路车辆的声压级，提供连续测量 在发动机转速范围内的声压级。 本文件仅适用于装有内燃机的L、M和N类道路车辆 引擎。车辆静止时内燃机无法运行的车辆 条件不在本文件范围内。 该方法旨在满足简单性的要求，只要它们与 车辆运行条件下结果的再现性。 在车辆型式认证测量期间，测量静止A计权声压级在本文件范围内；-制造阶段的测量； -在官方测试站进行测量；-路边测试的测量。 本文件详细说明了一种测试方法，用于确定参考声级，该参考声级对于 因此，不适合与一般限值（如试验条件）进行比较 相对于声源的条件位置可能会有很大的变化。试验条件接近 与实际运行条件相比，在发动机转速明显更高的情况下，故意选择在更高的背景条件下进行在用测试，这是路边检查的典型情况。 技术背景信息见附录A。交叉引用:ISO/IEC 17025ISO/IEC指南98-3IEC 61183IEC 61260-3IEC 61672-3IEC 61260-1ISO 26101:2017IEC 60942:2017IEC 61672-1ISO 80000-2ISO 5725（所有部分）IEC 61672-2SAE J1492:2008ISO 362-1:2015购买本文件时可提供的所有当前修订版。

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 roadside checks. Technical background information is given in Annex A.Cross References:ISO/IEC 17025ISO/IEC Guide 98-3IEC 61183IEC 61260-3IEC 61672-3IEC 61260-1ISO 26101:2017IEC 60942:2017IEC 61672-1ISO 80000-2ISO 5725 (all parts)IEC 61672-2SAE J1492:2008ISO 362-1:2015All current amendments available at time of purchase are included with the purchase of this document.