HEIDENHAIN ND 100 User Manual - Manual (Page 88)

88 2 Installation and Specifications
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p Nonlinear error correction (NLEC)
NLEC minimizes or eliminates the small inaccuracies in the X-Y
measurement plane due to machine irregularities and encoder
nonlinearity. Error correction coefficients are obtained by measuring a
certified calibration grid. The actual values are then compared to the
nominal grid values by the DRO. When NLEC is enabled, the
corrections are applied across the measured area of the X-Y
measurement plane. To apply NLEC to a measurement plane:
 Verify that the appropriate encoder reference marks are selected in
the Encoders setup screen (See "Encoders screen" on page 76).
 Verify that the Startup Zero field of the Measure setup screen is set
to Yes (See "Measure screen" on page 95).
 Cycle the DRO power off and then back on to establish the machine
zero if necessary.
 Press MENU>Setup to display the Setup menu and then highlight the
Scale Factor menu item.
 Verify that the Active choice field specifies No.
 Press MENU>Clear to clear all existing datums, part alignments and
part data.
 Press MENU>Setup to display the Setup menu and then highlight the
LEC menu item.
 Verify that all Standard and Observed data fields contain the value:
1.000 to eliminate the possibility that a previous LEC correction will
influence this NLEC correction.
Notice
Reference marks, or a manual reference position must be
recognized by the DRO upon startup to create a repeatable
machine zero. Machine zero is required for NLEC.
Notice
When scale factors are used, they must be applied after
error corrections.