Editing Quadrature
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Most optical encoder specify their resolution as pulses per revolution (PPR) which will equal 4X amount of position values per revolution. I.e. 1000 PPR encoder will yield resolution of 4000 counts per revolution. | Most optical encoder specify their resolution as pulses per revolution (PPR) which will equal 4X amount of position values per revolution. I.e. 1000 PPR encoder will yield resolution of 4000 counts per revolution. | ||
==Encoder PPR, CPR, LPR and resolution== | ==Encoder PPR, CPR, LPR and resolution== | ||
− | [[File:QuadratureEncoder.png|thumb | + | [[File:QuadratureEncoder.png|thumb|Basic principle of quadrature encoder which produces quadrature signals when code wheel rotates and detection light passes through segments at different phase. The encoder in the picture has 4 lines per revolution (LPR) thus it's resolution after 4X decoding is 16 counts per revolution.]] |
Most encoder suppliers specify quadrature encoder resolution as PPR (pulses per revolution) or LPR (lines per revolution). This specifies how many electrical pulses (0 to 1 transitions) there will be during one revolution. Some manufacturers (such as Avago and USdigital) uses name CPR (counts per revolution) to specify pulses per revolution which may seem counter-intuitive. | Most encoder suppliers specify quadrature encoder resolution as PPR (pulses per revolution) or LPR (lines per revolution). This specifies how many electrical pulses (0 to 1 transitions) there will be during one revolution. Some manufacturers (such as Avago and USdigital) uses name CPR (counts per revolution) to specify pulses per revolution which may seem counter-intuitive. | ||
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| Mechanical servo accuracy including [[tracking error]] || Theoretically 1/8000. In typical case this would yield 1/500 to 1/2000 mechanical accuracy in dynamic conditions (not standing still). | | Mechanical servo accuracy including [[tracking error]] || Theoretically 1/8000. In typical case this would yield 1/500 to 1/2000 mechanical accuracy in dynamic conditions (not standing still). | ||
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