Resolution

Resolution relates to the quantity of increments an encoder has in one rotation (for a rotary encoder). An encoder disk has a specified number of lines on it providing for a native resolution equal to the number of line/window pairs on the disk. Resolution can be increased via interpolation, multiplying the native resolution by any number of times. This output, either native or interpolated is the encoder resolution which US Digital refers to as the CPR—cycles per revolution. Using two channels (A & B) of a quadrature encoder enables the output of the encoder to be decoded up to four times the native or interpolated encoder output. US Digital refers to that special decoding as PPR standing for Pulses Per Revolution.