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The word Digital Tachometer is derived from two Greek words: tachos means “speed” and metron means “to measure”. It works on the principle of a Digital Tachometer generator, which means when a motor is operated as a generator, it produces the voltage according to the velocity of the shaft. It is also known as revolution-counter, and its operating principle can be electromagnetic, electronic or optical-based. Power, accuracy, RPM range, measurements and display are the specifications of a Digital Tachometer. Digital Tachometers can be analog or digital indicating meters; however, this article focuses only on the digital Tachometers.
Digital Tachometer Types • The Digital Tachometer are classified into four types based on the data acquisition and measurement techniques. • Contact type • Non-Contact type • Time measurement • Frequency measurement
The Digital Tachometer counters on cars, aircraft, and other vehicles show the rate of rotation of the engine's crankshaft, and typically have markings indicating a safe range of rotation speeds. This can assist the driver in selecting appropriate throttle and gear settings for the driving conditions. Prolonged use at high speeds may cause inadequate lubrication, overheating (exceeding capability of the cooling system), exceeding speed capability of sub-parts of the engine (for example spring retracted valves) thus causing excessive wear or permanent damage or failure of engines.
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