Consider two possible schemes for measuring angular velocity with an encoder. In

Question

Consider two possible schemes for measuring angular velocity with an encoder. In Scheme A, a timer is set for a specified time interval TA, and the number of W/B transitions, MA, Occurring in that interval are counted. In Scheme B, the time, TB. required for a fixed number MB of W/B transitions is measured. Which of the following statements is true? 1. In scheme A, time interval TA is not the exact time that has elapsed for MA W/B transitions. 02. In scheme A, time interval TA is the exact time that has elapsed for MA W/B transitions. 3. Scheme A and scheme B, both have the same level of accuracy. 04. Scheme A is better than scheme B. 5 Scheme A is equivalent to scheme B.

Explanation / Answer

5) Scheme A is equivalent to scheme B

As the counter measures the velocity of the encoder using the A and B signals, which are offset by 90°. The velocity is calculated using the A and B input signal transitions and the amount of time that elapses between the changes in the encoder count value.

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