Here in this PPT I’ll discuss several types of tachometers that are classified on the basis of their working principle, construction, and usage. Take a look at some of its major types:
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They are very simple and easy to use. Their needle gives the current reading and marking shows the current and dangerous levels. But, they are not designed to store the readings and they cannot compute details like deviation and average.
This type of tachometer is basically a permanent magnet generator. Its output is indicated as 2 to 10 volts per 1,000 rpm. For speed indications, there is a voltmeter with a high resistance value that is built with calibration in RPM
As the name suggests it is an alternating current tachometer, which consists of revolving permanent magnet field with a stationary winding. The voltage output and frequency which it generates remains in proportion rotation speed.
They consists of LCD or LED readout and have enough memory for storage. These are known for performing statistical operations and gives precision measurements. Digital tachometers give accurate readings in numerical form, which is far better than using dials and needles