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A tachogenerator is is an electric generator that generates a voltage that is accurately proportional to the speed of the shaft. Generating a voltage proportional to the speed is an inherent characteristic of all generators, but tachogenerators are specifically designed to provide an accurate signal over a specified range of load currents and operating temperatures. The output signal from a tachometer generator(tachogenerator) is often used to provide feedback to improve the regulation of an electric motor speed control.

A tachometer is an instrument that measures and displays rotational speed. An electric tachometer combines the tachogenerator with a voltmeter that has the dial marked to show speed rather than voltage.

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Q: What is the difference between tachogenerator and tachometer?
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