Extremely wide speed range measurement system

The speed measurement system is based on an advanced single buffered method utilizing both the pulse counting and the period measurement. The extremely wide speed range from 5×10−5 to 1830 rpm is independent of the sampling time, chosen between 100 μs and 22 ms. The maximum static relative error is limited to 6.67×10−4 for 1 ms or 6.67×10−3 for 100 μs sampling time. This method is useful for a real-time control and an off-line speed analysis.