HEIDENHAIN ND 1400 - Manual (Page 128)

114 QC-300 Series User’s Guide
4 Check the Phase Display box to display the combined phases of
the encoder output as an ellipsoidal pattern when the encoder is moved
slowly between the limits of motion. Move the encoder and evaluate
the resulting pattern. The combined-phase pattern will form a circle
when the encoder output phase amplitudes are equal. Generally when
the pattern displayed is not circular, the reader head will need to be
realigned, and the encoder recalibrated from the beginning.
The contrast of the pattern can be changed to facilitate the evaluation
of phase. Touch the Depth button to display the Persistence data field.
Enter higher values for higher-contrast images.
5 Repeat the process described in steps 1 through 4 to calibrate ana-
log encoders on the remaining axes.