Multiple turn absolute encoder measuring range large than single turn absolute encoder！

Single-turn absolute encoder to measure the rotation of each channel optical encoder engraved lines to obtain a unique code, when rotated more than 360 degrees, the encoding back to square one, which does not comply with the principle of an absolute encoder only, so rotary encoder can only be used within the scope of measure 360 degrees, known as single-turn absolute encoder. To measure the rotation of more than 360 degrees, it is necessary to use multi-turn absolute encoder.
Encoder manufacturers use mechanical timepiece gear principle, when the center of the code wheel rotates through another set of code wheel gear (or sets of gear, multiple sets of code disk), single-turn encoder, based on the additional number of turns coding, to expand the measurement range of the encoder, absolute encoder so called multi-turn absolute encoder, it is also a unique coding for each location will not be repeated, without memory.
Another advantage of the multi-turn encoder is due to the large measurement range, the actual use is often more affluent, so that the installation of unnecessary hard to find zero, as a starting point to an intermediate position on it, and greatly simplifies the installation difficult.

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