Explanation of Specifications
   Measuring Standard       Accuracy        Scanning       Interfaces       Mounting       Explanations   
   
   
Accuracy
   
  The accuracy of rotary encoders is influenced mainly by:
 
The directional deviation of the radial grating.
The eccentricity of the graduated disk to the bearing.
The radial deviation of the bearing.
The error resulting from the connection with the rotor couplings. On rotary encoders with stator coupling this error lies within the system accuracy.
The interpolation deviation during signal processing in the integrated or external interpolation and digitizing electronics.
   
   
   
  For incremental rotary encoders with line counts up to 5000:
The extreme values of directional deviation at 20 C ambient temperature and slow speed (scanning frequency between 1 kHz and 2 kHz) lie within
 
 18 mech. 3600    [angular seconds]
Line count z
 
which equals
 
 1   grating periods.
 20 
   
  ROD rotary encoders with line counts of 6000 to 10000 have a system accuracy of 12 angular seconds.
   
 
incremental rotary encoders Circular graduations of
incremental rotary encoders
   
   
   
  The accuracy of the absolute position values from absolute rotary encoders is given in the specifications for each model.
 
For absolute rotary encoders with additional incremental signals, the accuracy depends on the line count:
   
 
Line count Accuracy
  512 60 angular seconds
2048 20 angular seconds
8192 10 angular seconds
   
  The above accuracy data refer to incremental measuring signals at an ambient temperature of 20 C (68 F) and at slow speed.
   
 
absolute rotary encoders Circular graduations of
absolute rotary encoders
   

 


 
 

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