1.1 本试验方法包括在100℃下对发动机机油粘度的实验室测定 °C和1·10 6. s –1 使用锥形轴承模拟器（TBS）粘度计。 2. 注1: 该试验方法与试验方法类似 D4683 使用相同的TBS粘度计测量150℃下的高剪切粘度 °C。 1.2 用于建立本试验方法的牛顿校准油的范围约为5 mPa·s（cP）至12 100 mPa·s（cP） °C，每个参与者在制定精度声明时使用手动或自动协议。 该温度下试验方法的粘度范围为1 mPa·s（cP）至25以上 mPa·s（cP），取决于TBS的模型。 1.3 用于确定1·10剪切速率的非牛顿参考油 6. s –1 本试验方法的粘度约为10 100 mPa·s °C。 1.4 在准备本试验方法的粘度信息时，尚未确定是否适用于除发动机机油以外的石油产品。 1.5 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。本试验方法使用毫帕秒（mPa·s）作为粘度单位。该单位相当于厘泊（cP），如括号所示。 1.6 本标准并非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制定适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 1.7 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 本试验方法的剪切速率和温度下的粘度被认为是大中速往复式发动机以及在此温度条件下运行的汽车和重型发动机轴承条件的特别代表。 5.2 铁路规范强调了在这些条件下粘度的重要性。 5.3 对于其他行业的需求，该方法也可以在80%下运行 °C，使用制造商提供的不同交叉校准油。在此温度下，尚未确定精度。如试验方法所示，该设备也可在较高温度下使用 D4683 和CEC L-36-90（也参考IP 370）。

1.1 This test method covers the laboratory determination of the viscosity of engine oils at 100 °C and 1·10 6 s –1 using the Tapered Bearing Simulator (TBS) viscometer. 2 Note 1: This test method is similar to Test Method D4683 which uses the same TBS viscometer to measure high shear viscosity at 150 °C. 1.2 The Newtonian calibration oils used to establish this test method range from approximately 5 mPa·s (cP) to 12 mPa·s (cP) at 100 °C and either the manual or automated protocol was used by each participant in developing the precision statement. The viscosity range of the test method at this temperature is from 1 mPa·s (cP) to above 25 mPa·s (cP), depending on the model of TBS. 1.3 The non-Newtonian reference oil used to establish the shear rate of 1·10 6 s –1 for this test method has a viscosity of approximately 10 mPa·s at 100 °C. 1.4 Application to petroleum products other than engine oil has not been determined in preparing the viscometric information for this test method. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. This test method uses the milliPascal second (mPa·s) as the unit of viscosity. This unit is equivalent to the centiPoise (cP), which is shown in parentheses. 1.6 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 to determine the applicability of regulatory limitations prior to use. 1.7 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 Viscosity at the shear rate and temperature of this test method is thought to be particularly representative of bearing conditions in large medium speed reciprocating engines as well as automotive and heavy duty engines operating in this temperature regime. 5.2 The importance of viscosity under these conditions has been stressed in railroad specifications. 5.3 For other industry needs this method may also be run at 80 °C by using different crossover calibration oils available from the manufacturer. No precision has been determined at this temperature. The equipment is also used at higher temperatures as shown in Test Method D4683 and CEC L-36-90 (also referenced from IP 370).