标准摘要
[中文适用范围]： 第二版取消并取代了第一版（1982 年）。 本部分是八个系列中的第四部分。 规定了测量稳定速度运行的拖拉机发动机所发出的烟雾的方法。 附录 A 给出了不透光烟度计的特性；附件 B 描述了透光烟度计的安装和使用；附件 C 列出了参考燃料规格；附件 D 包括样本测试报告。 [外文原描述]： This second edition cancals and replaces the first edition (1982). This part is the fourth of a series of eight. Specifies a method of measuring the smoke emiited by the engines of tractors operating at a steady speed. Annex A gives characteristics of opacimeters; installation and use of theopacimeter is described in annex B; annex C tabulates reference fuel specifications; annex D includes an specimen test report.
英文名称Agricultural tractors — Test procedures — Part 4: Measurement of exhaust smoke