描述了一种在恒定流量和恒定扭矩条件下测定容积式旋转流体动力马达低速特性的方法。该方法涉及低速测试，这可能会产生对电机稳定连续扭矩输出有重大影响的频率，并影响电机将连接到的系统。测量精度分为三类，A、B和C，详见附录A。

Describes a method of determining the low-speed characteristics of positive-displacement rotary fluid power motors under constand flow and constant torque conditions. The method involves testing at slow speeds, which may generate frequencies having a significant influence upon the steady continuous torque output of the motor and affect the system to which the motor would be connected. The accuracy of measurement is divided into three classes, A, B and C, which are explained in annex A.