Optical Rotary Encoder Accuracy ！

Accuracy of rotary encocer (unlike resolution) depends in whole-system interations with the application, and is traceable to the encoding disc (a subcomponent we’ll discuss further) and the deviation between actual and theoretical position. A good 12 or 13-bit encoder, for example, accuracy of rotary encoder is accurate to within half a count on the least significant bit.

Repeatability, the encoder’s ability to read the same point each time the shaft is in a particular position, is defined as the deviation of actual encoder position between subsequent identical code readings. Although it has no relation to accuracy, it is usually four to ten times better.

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