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3.5 Online Compensation (Offset and Amplitude Control)
Contamination and mounting errors lead to interferences in the optical scanning of the scale
by the scanning head and so to periodic deformations of the sinusoidal counting track signals,
which are exemplified as
• Offset deviations
• Amplitude deviations
• Amplitude differences between the sine and cosine channels
and lead to interpolation errors�
U
sin
+ U
cos
U
sin
/U
cos
U
sin
+ U
cos U
sin
/U
cos
U
sin
/U
cos
U
sin
+ U
cos
U
sin
+ U
cos
U
sin
/U
cos
U
sin
+ U
cos U
sin
/U
cos
U
sin
/U
cos
U
sin
+ U
cos
U
sin
+ U
cos
U
sin
/U
cos
U
sin
+ U
cos U
sin
/U
cos
U
sin
/U
cos
U
sin
+ U
cos
Image 5
Image 4
Image 3
Incorrect Mounting
Scanning head signal with faulty
mounting before activation of the
online compensation�
Active Online Compensation
Scanning head signal with
contaminated scale tape and/or
faulty mounting after activation of the
online compensation�
Contaminated Scale Tape
Scanning head signal with
contaminated scale tape
before activation of the online
compensation�