HEIDENHAIN ND 1200 - V2.16, Operating Instructions Manual, Page: 96 / 141

96 2 Installation and Specifications
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Optical edge detection setup
The Edge menu and Misc setup screen contain fields and other tools
for configuring optical edge detection.
Edge menu tools
The Edge menu contains tools for installing and calibrating optical
edge detection. To install optical edge detection:
U Turn the ND 1200 and the comparator on to check the optical light
levels.
U Press MENU/EDGE/INSTALL to display the Light Levels screen.
Two vertical bars will be shown. The left bar shows the screen
sensor light level, and the right bar shows the reference light level.
The light levels are relative and extend from 0 to 255.
U
Position the reference cable near the comparator light source to
increase the Ref value until it reaches 255, and the left vertical bar
reaches the top.
U
Move the stage to position the optical sensor first over a dark area
then over an illuminated area of the screen. The SCR value should
increase from a low value to a higher value. Acceptable values can
be from 10% to 90% of the range indicated by the right vertical bar.
A mid value near 128 is ideal, but lower and higher values are
satisfactory.
U Press the FINISH key to return to the DRO screen.
U Calibrate the optical edge detector as described in chapter 1 (See
"Calibrate the optical edge detector" on page 33).
Press MENU/EDGE/INSTALL to display
the Light Levels screen and vertical bars Position the reference cable until the
REF value is 255 and the right bar is at
the top Positioning the sensor over an
illuminated area causes the SCR value to
increase