本文件规定了往复式内燃机声功率级的测量方法，这是一种现场使用的测量方法。 本文件适用于ISO？3046-1应用范围内的所有往复式内燃机，以及不存在适用国际标准的其他内燃机。 注？在本文件中，除非另有说明，否则往复式内燃机称为发动机。

This document specifies the measurement method of sound power level for reciprocating internal combustion engines, which is a survey method for use in situ. This document applies to all reciprocating internal combustion engines falling within the field of application of ISO 3046-1 and other internal combustion engines where no suitable International Standard exists. NOTE       In this document, reciprocating internal combustion engines are referred to as engines unless otherwise explained.