Which instrument is used to measure the speed of a Direct Drive Fan Motor?

The tachometer is the instrument specifically designed to measure the rotational speed of a fan motor, such as a Direct Drive Fan Motor. It provides real-time data on the number of revolutions per minute (RPM), which is crucial for evaluating the fan's performance and operation. Monitoring the speed helps technicians ensure that the system is operating as intended and allows for adjustments if necessary.

Other instruments have distinct functions and do not serve this purpose: a manometer measures the pressure of gases or liquids, a voltmeter assesses voltage in electrical systems, and a pressure gauge monitors pressure levels in various applications. While these instruments are valuable in their specific contexts, they do not provide information on the speed of rotating machinery like a tachometer does.