直流测速发电机是一种测速元件，它把转速信号转换成直流电压信号输出。
直流测速发电机是一个速度传感器，开发直流电压与电机连接的速度成正比。
The DC Tachogenerator is a speed transducer, which develops DC voltage proportional to speed of the motor connected to it.
本文对778光电经纬仪直流力矩电动机与直流测速发电机的调试作了理论分析和实际调试方法的叙述，给出了电机主要参数与结果。
The article analyses and describes the adjustment of DC torque motor and DC speed-measuring motor for 778 photo-theodolite. Main parameters of the motor and results are also given.
本文通过对两起提升机直流调速系统故障的分析，阐述了测速发电机日常维护的重要性，并对如何维护提出建议。
The article analyzes two faults in DC-timing-system of hoist, presents the importance of routine maintenance on measure of speed dynamo, and puts forward proposals about maintenance.
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