Incremental and absolute measurements of spindle encoder.！

 Incremental and absolute measurements
The incremental detection method measures only the displacement increment and uses the number of digital pulses encoder to represent the number of units (ie, the minimum set unit). Each measurement unit sends a measurement signal. The advantage is that the detection device is relatively simple, any one of the midpoint can be used as a measurement starting point. But in this system, the distance is calculated by accumulating the measured signal, once the cumulative error, then the measurement results will be all wrong. In the event of a failure (such as power failure) can not find the correct location before the accident, the accident is removed, the table must be moved to the starting point to re-count to find the correct location before the accident. Pulse encoders, rotary transformers, inductive synchronizers, gratings, magnetic grids, laser interferometers, etc. are incremental detection devices.
Absolute measurement method is measured in a certain absolute coordinate system in the absolute coordinate position value, and the binary or decimal digital signal that is generally converted to a pulse after the digital signal can be sent to compare And display. In this way, the higher the resolution requirements, the more complex the structure. Such a measurement device has an absolute pulse encoder, three-speed absolute encoder (or multi-turn absolute encoder) and so on.

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