Pseudo-Absolute Encoder

A Pseudo-Absolute Encoder is an incremental encoder used as an absolute encoder on single turn applications which use a homing cycle. This requires that the media (disk or linear strip) include an index. On power-up, the system performs a homing cycle, moving until the index is detected. At that point the exact position is determined. To reduce the amount of movement required to find the index, the media can use more than one index with a unique number of line/window pairs between the indices. During the homing cycle, as soon as the second index is located, the exact position is determined.