HEIDENHAIN ND 1300 OED and Crosshair Systems - Manual (Page 207)

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Setup
will be entered into the Cross Cal Offset value fields automatically by the system during the calibration
process.
2 When the cross calibration is complete, use the crosshairs, and then the edge detector probe to measure
the same circle and compare the measurement results to verify that the teach calibration was successful.
Performing parcentric calibrations
Parcentric calibration eliminates X and Y axis measurement offset errors
that can occur when changing magnifications. Parcentric calibrations are
performed using a single circle artifact in the calibration process dia-
grammed at the right and described below. To perform parcentric calibra-
tions:
1 Zero any existing Parcentric and Parfocal X and Y offsets by selecting
each magnification and entering zero values
into the Offset X and Offset Y data fields.
2 Select the highest optical magnification.
3 Focus the circle artifact image.
4 Measure the circle artifact and create a zero datum point at the center
of the circle feature in the DRO screen. This will zero the X and Y axes at
the center of the circle. Subsequent measurements of this circle artifact at
other magnifications will result in X and Y axis offsets with respect to this
magnification. These offsets will be entered into the Magnification setup
screen for each corresponding magnification.
Magnifications Screen
Measure a circle using the highest
magnification...
and then zero the X and Y axes to
create a zero datum