HEIDENHAIN QUADRA-CHEK 3000 Operating Instructions Manual page 205

Measurement | Conducting a measurement
Setting the contrast threshold
The currently selected contrast threshold of the product may need to be adjusted
to varying brightness conditions of the surroundings, e.g. changes in daylight. The
contrast threshold defines the contrast value starting from which the product will
recognize a light-to-dark transition as a transition.
A change in brightness could result in light-to-dark transitions—and therefore
edges—being detected earlier or later, thus falsifying the measurements.
Further information:
HEIDENHAIN | QUADRA-CHEK 3000 | Operating Instructions | 6/2016
Tap Settings in the main menu
Tap Sensors
Open in the sequence
Video edge detection (VED)
Contrast settings
Select the Edge algorithm for the edge detection
Tap Start
The teach sequence is started and the Measure menu is
displayed
Follow the instructions of the wizard
Select the lighting palette
Adjust the sliders to achieve the highest possible contrast at
the edge
Tap Confirm in the wizard to confirm the positioning of the
measuring tool and the lighting settings
The teach sequence is complete
Tap Undo to repeat the teach sequence
Tap Close to close the wizard
"Contrast settings", page 328
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