1.1 本试验方法涵盖了一种现场和实验室使用的快速便携式方法，用于目视检查航空涡轮和馏分燃料中的颗粒物和自由水的数值速率。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 有关特定警告声明，请参见 11.2.3 和 附件A1 . 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ===意义和用途====== 5.1 该试验提供了一种现场试验，以目视评估燃料样品中的颗粒物和游离水，类似于试验方法 D4176 加上自由水的数值额定值。 高数值额定值表明燃料相对不含游离水。水和颗粒污染的程度可以使用其他方法测量，如试验方法 D2276 , D2709 和 D6304 . 注2: “干净明亮”有时用来代替“干净明亮”。意思是一样的。 5.2 样品的颜色不影响测量。对样品的有限实验室评估已确定，在试验方法中，具有深色不透明颜色的燃料中，自由水的程度可被评定为比五级更暗 D1500 .

1.1 This test method covers a rapid, portable means for field and laboratory use to inspect visually for particulate matter and numerically rate free water in aviation turbine and distillate fuels. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see 11.2.3 and Annex A1 . 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The test provides a field test to evaluate visually a fuel sample for particulate matter and free water similar to Test Method D4176 plus a numerical rating for free water. High numerical ratings indicate that the fuel is relatively free of free water. The degree of water and particulate contamination can be measured using other methods such as Test Methods D2276 , D2709 , and D6304 . Note 2: Clean and bright is sometimes used in place of clear and bright. The meaning is identical. 5.2 The color of the sample does not affect the measurement. Limited laboratory evaluations of samples have determined the degree of free water can be rated in fuels with dark opaque color having a darker rating than five in Test Method D1500 .