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Segmented linear error correction (SLEC)
SLEC compensates for machine irregularities and encoder non-
linearities by applying correction values to individual segments that
cover the entire range of motion along an axis. To apply SLEC to a
measurement axis:
U
Verify that the crosshair probe is selected. Press the PROBE soft
key to select it if necessary.
U
Verify that the appropriate encoder reference marks are selected in
the Encoders setup screen (See "Encoders screen" on page 92).
U
Verify that the Startup zero field of the Measure setup screen is set
to YES (See "Measure screen" on page 112).
U
Cycle the ND 1200 power off and then back on the establish the
machine zero if necessary.
Reference marks, or a manual reference position must be
recognized by the ND 1200 upon startup to create a
repeatable machine zero. Machine zero is required for
SLEC error correction.
U
Press MENU/SETUP to display the setup menu and then highlight
the Scale Factor menu item.
U
Verify that the Active choice field specifies NO.
When scale factors are used, they must be applied after
error corrections.
U
Press MENU/SETUP to display the setup menu and then highlight
the LEC menu item.
U
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 SLEC correction.
U
Highlight the NLEC setup menu item and verify that the NLEC
choice field specifies OFF.
SLEC can not be performed if a different error correction
is already enabled.
U
Highlight the SLEC setup menu item and verify that the Enabled
choice field is OFF. SLEC correction can not be configured while
SLEC is enabled.
102
2 Installation and Specifications
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