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Reference.org
Encoder (position)
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<p>An encoder is a sensor which turns a position into an electronic signal. </p><p>There are two forms: </p> <ul><li><a href="/facts/Absolute_encoder/HonPQvzJ">Absolute encoders</a> give an absolute position value.</li> <li><a href="/facts/Incremental_encoder/5sWEjwjr">Incremental encoders</a> count movement rather than position. With detection of a datum position and the use of a counter, an absolute position may be derived.</li></ul> <p>The position may be measured as either linear or angular position </p> <ul><li><a href="/facts/Linear_encoder/yslJ6jeE">Linear encoder</a>, converts linear position to an electronic signal</li> <li><a href="/facts/Rotary_encoder/HonPQvzJ">Rotary encoder</a>, converts rotary position to an electronic signal</li></ul>