How does resolution, accuracy and repeatability effect position feedback in a control system?

Resolution defines the smallest measurement that can be made, and thus defines the smallest position increment possible. Accuracy is how the system moves relative to perfect motion. If we commanded a 100 mm move, did the system actually move 100mm ? The error is Accuracy. Repeatability is how well we can repeat a move. Using the 100 mm example, if we did 1000, 100 mm moves, and every time were within 100.5 +/- 0.1, the repeatability would be 0.1 and the Accuracy is 0.5 mm. It is also important to note that accuracy vs. position variation causes velocity variations of the moving object.

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