capacitor tachometer

例句：

1. 1. The capacitor tachometer is used to measure the rotational speed of a rotor in an electric motor.
   电容式转速计用于测量电动机转子的旋转速度。
2. 2. The capacitor tachometer was installed on the machine to monitor its performance accurately.
   在机器上安装了电容式转速计，以准确监测其性能。
3. 3. The engineer used the capacitor tachometer to troubleshoot the issue and determine the cause of the slowdown.
   工程师使用电容式转速计来诊断问题并确定减慢的原因。