In rotary encoders, what does CPR stand for?

• A. Counts Per Rotation
• B. Cycles Per Rotation
• C. Counts Per Revolution
• D. Cycles Per Revolution

Answer: (C)

The main idea here is encoder resolution: how many discrete position steps you get in one full turn of the shaft. CPR, or Counts Per Revolution, tells you that directly—the number of counts produced during a complete 360-degree rotation. That makes it the precise way to express how finely the encoder can distinguish different angles.

Why this term is the best fit is because it uses “counts” (the discrete increments you detect) and “revolution” (one full turn). It matches how encoders are specified and how you’ll use the data for positioning and control. The other phrasing with “cycles” isn’t the standard way encoders are described, and “rotation” is a synonym for revolution but isn’t the conventional unit used in the spec. So Counts Per Revolution is the correct, standard expression.