Discussion
A drive quoted as having a 1,000 to 1 speed range with an encoder of 1,024 pulses per revolution will at the bottom of that range
Answer: B
Estimating speed by counting pulses in a fixed window becomes coarse when few arrive, so very low speeds need either a finer encoder or a period-measurement method. It is a common reason for poor low-speed performance in an otherwise sound drive.
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