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Tachometers can be used to measure speeds (of linear or rotary movement), rates (per minute or per hour), or rates of flow (volumetric, etc.). Pulses are fed to the tachometer at the frequency to be measured. A scale factor is applied to produce readings of the desired type (linear speeds, flow rates, etc.). Crouzet/Syrelec tachometers operate on 2 different principles : 1 - The fixed time base principle, and 2 - The reciprocal principle
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"Basic principles of tachometers"
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