Single-Turn vs. Multi-Turn
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In a single-turn encoder, the encoder shaft makes one revolu-tion for one complete cycle of machine operation, where as in a multi-turn application, the encoder shaft makes more than one revolutions to complete one machine cycle. Angular rota-tion of a crankshaft in a punch press or rotary indexing table are typical examples of single-turn applications. In linear posi-tioning, where the encoder shaft makes several turns to com-plete total travel, a multi-turn encoder will be required.

Absolute multi-turn encoders and resolvers are available with various built-in gear ratios. Incremental encoders can be used both in single-turn and multi-turn applications.