Tachometers measure pulses per unit of time, typically pulses per second with frequency measurements or pulses per minute with rotary speed measurement or production quantities and volumes. Two different measurement principles are used: time-interval measurement, where the time between 2 pulses is measured, or gate time (time base), where the number of pulses within a certain time window is measured. The latest models use a mix of both principles, which offers a fast reaction time coupled with the greatest possible accuracy. Devices with limit values can be used for monitoring rotary speed or rate of production.
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