eddy-current tachometer

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eddy-current tachometer

instrument

Also known as: drag tachometer

Learn about this topic in these articles:

operation

In tachometer
The eddy-current, or drag, type is widely used in automobile speedometers; a magnet rotated with the shaft being measured produces eddy currents that are proportional to angular speed. Electric-generator tachometers work by generating either an alternating or a direct current. The stroboscope, an instrument that illuminates…
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