An algorithm and the microprocessor implementation thereof for the measurement of angular velocity and acceleration of rotating machinery are presented. The speed reference signal is derived from a pulse train at a frequency of only one pulse per revolution. This fact places severe constraints on the resolution and measuring time of the instrument. To detect a rate of change of speed of 1 r.p.m./min, a measuring time of at least 1 min is required. Over a 30-s measuring period it is possible to detect a rate of only 4 r.p.m./min. The resolution, therefore, is dependent on the measuring time, and a fixed relationship exists between these two parameters. The values obtained for either velocity or acceleration/deceleration will be average values for the measuring period. The instrument has been implemented using standard microprocessor components and supporting circuitry. The results obtained so far are highly satisfactory.
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