How to distingush single-turn and multi-turn absolute encoder?！

Single-turn and multi-turn encoders refer to absolute rotary encoders, which can sense the current absolute angular position at any moment, especially at the moment of power-up.
 
The single circle can only be perceived within a circle of absolute angular position;
  Multi-turn can not only sense the absolute angular position within a circle, but also can sense the number of revolutions of the rotary encoder since the date of use.

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