The resolution and accuracy of the encoder！

the resolution and accuracy of the encoder
 
 
    On the sensor resolution and accuracy of understanding, we can use the mechanical three-pointer-type watch to play such a metaphor: hour hand resolution is hours, minute hand resolution is minutes, second hand resolution is seconds, quick eye reaction , Through the second hand in the second space, we can even distinguish to about 0.3 seconds, which is three-pin mechanical pointer watches can do; and precision is what each watch is the accuracy of standard time, which is Each watch is different, or at different times of use (farther or faster or farther and slower), roughly between 1 second and 30 seconds.
    Similarly, in the use of rotary encoders, resolution and accuracy are two completely different concepts.


    The resolution of the encoder is the minimum angle that can be read and output by the encoder. The corresponding parameters are: line per revolution, pulse per revolution (PPR), minimum step, (Bit) and so on.
    The accuracy of the encoder refers to the accuracy of the actual angle measured by the encoder output signal data. The corresponding parameters are angle (°) and angle seconds ( ").

    Resolution: The line is the optical line of the encoder's encoder. If the encoder is a direct square wave output, it is the number of pulses per revolution (Fig. 1), but if it is a cosine (sin / Cos) signal output, it is possible to change the electronic subdivision by the analog quantity of the signal to obtain more square wave pulse PPR output (Figure 2). The square wave output of the encoder has A phase and B phase, A phase and B phase difference of 1/4 pulse period, you can determine the direction of rotation (in turn is 3/4 cycles), can also be through the rising edge and falling edge of the Judgment, you can get 1/4 pulse cycle of the change in step (4 times), which is the smallest measurement step (Step), so strictly speaking, the minimum measurement step is the encoder resolution.

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