1.1 本试验方法包括在-40℃下，使用恒定剪切应力粘度计测量传动系润滑剂（齿轮油、自动变速器油等）的粘度 °C至10 在规定的预热和受控冷却至最终试验温度后，°C。对于-40的测试温度，规定了精度 °C至-26 °C。 1.2 尚未确定该特定试验方法对除传动系润滑剂以外的石油产品的适用性。 1.3 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。 1.3.1 本标准使用基于国际单位制的单位毫秒（mPa·s）表示粘度，相当于厘泊（cP）。 1.4 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在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 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 传动系润滑剂在低温下的粘度对齿轮润滑和自动变速器中的流体循环至关重要。对于齿轮油（GOs），问题是流体特性是否会使油在水下齿轮开始旋转和重新旋转时流入其挖出的通道- 在它们继续旋转时对其进行润滑。对于自动变速器油液、扭矩和拖拉机油液，问题是油液是否会以足够快的速度流入泵并通过分配系统，以使设备正常工作。 5.2 传动系润滑剂流动特性的低温性能最初通过通道测试进行评估。在本试验中，将平底锅填充至约2.5 cm的规定深度，然后冷却至试验温度。在试验温度下浸泡指定时间后，通过液体的整个深度和锅的长度刮擦通道来进行试验。测量并报告了液体覆盖通道所需的时间。通道测试被测试方法取代 D2983 1971年。 5.3 该试验程序的结果与试验方法中获得的粘度测量值相关 D2983 . 4. 获得的相关性为: 哪里: 五、 = 通过本试验方法测量的表观粘度，以及 五、 D2983 = 用试验方法测量的表观粘度 D2983 . 5.3.1 该方程是通过强制拟合过零得到的。变异系数( R 2. )因为该相关性为0.9948。

1.1 This test method covers the measurement of the viscosity of drive line lubricants (gear oils, automatic transmission fluids, and so forth) with a constant shear stress viscometer at temperatures from –40 °C to 10 °C after a prescribed preheat and controlled cooling to the final test temperature. The precision is stated for test temperatures from –40 °C to –26 °C. 1.2 The applicability of this particular test method to petroleum products other than drive line lubricants has not been determined. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 This standard uses the SI based unit of milliPascal second (mPa·s) for viscosity which is equivalent to centiPoise (cP). 1.4 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. 1.5 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 of drive line lubricants at low temperature is critical for both gear lubrication and the circulation of the fluid in automatic transmissions. For gear oils (GOs), the issue is whether the fluid characteristics are such that the oil will flow into the channel dug out by the submerged gears as they begin rotating and re-lubricating them as they continue to rotate. For automatic transmission fluids, torque, and tractor fluids the issue is whether the fluid will flow into a pump and through the distribution system rapidly enough for the device to function. 5.2 The low temperature performance of drive line lubricant flow characteristics was originally evaluated by the channel test. In this test, a pan was filled to a specified depth of approximately 2.5 cm and then cooled to test temperature. The test was performed by scraping a channel through the full depth of the fluid and across the length of the pan after it had soaked at test temperature for a specified time. The time it took the fluid to cover the channel was measured and reported. The channel test was replaced by Test Method D2983 in 1971. 5.3 The results of this test procedure correlate with the viscometric measurements obtained in Test Method D2983 . 4 The correlation obtained is: where: V = the apparent viscosity measured by this test method, and V D2983 = the apparent viscosity measured by Test Method D2983 . 5.3.1 The equation was obtained by forcing the fit through zero. The coefficient of variation ( R 2 ) for this correlation is 0.9948.