HEIDENHAIN ND 1400 - Manual (Page 127)

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10
Setup
Calibrating analog encoders
The process of calibrating analog encoders is identical for current and voltage output devices. To calibrate
an analog encoder:
1 Select the desired axis and touch the Cal button. The calibration
screen will be displayed and you will be instructed to move the axis.
2 Touch OK and begin moving
the axis in slow, gradual back and
forth or up and down motions. The
sine wave output of the analog en-
coder will be displayed as the axis
is moved. The display is shown
as two sine waves that are 90 de-
grees out of phase. The real-time
display changes as the encoder is
moved, however, still images can be captured for evaluation at any time by clicking the Pause button.
NOTE
The wave shape can include imperfections that won’t affect the accuracy of measure-
ments. However, erratic frequency or amplitude variations or high noise content can
cause inaccuracies. If any continuing erratic output is noted, or if scale errors appear,
check the encoder head mounting, alignment and wiring for problems.
3 Continue moving the encoder slowly between the limits of mo-
tion until scale errors are encountered or the process completes without
scale errors. The system will fit the wave shape between the two hori-
zontal lines as the calibration is performed. A dialog box will appear
upon completion that shows encoder position and scale errors. When
calibration has been completed without scale errors, click OK.
NOTE
The display of scale position and error counts can be
recalled at any time by clicking the Counter button.
Encoder Screen