HEIDENHAIN IK 5293 - Manual (Page 344)

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Chapter 8 Setup
Step 8
Move the encoder back and forth along the selected axis.
The custom encoder setup window indicates that the calibration is complete
and reports the number of scale errors.
Step 9
Click OK to accept calibration results.
Use the phase mode to determine if the encoder’s two waveforms are adjusted to
each other. Properly adjusted encoders results in a circle as shown.