About User Calibration - Konica Minolta CA-410 Instruction Manual

3. About User Calibration

• User calibration allows users to set their own correction coefficients to the calibration channel of the probe by measuring
any display colors and setting calibration values (x, y, Lv) to the instrument.
Afterward, the value corrected with the specified correction coefficients will be displayed/output for every measurement.
• Two types of user calibration can be performed for a CA-410 series probe: single-point calibration and RGB+W matrix
calibration.
• RGB+W matrix calibration has been performed when the instrument is shipped from the factory.
• User calibration is performed independently for each probe.
• User calibration can be performed for every calibration channel (except for CH00).
• When a probe is used for the first time after being shipped from the factory, measurement is performed in accordance
with the Konica Minolta calibration standard in all calibration channel. You can use user calibration to apply the following
corrections to measurements based on the specified correction coefficients.
(1) Corrects the difference in the reading due to the deviation of spectral response from the CIE 1931 color-matching
function.
(2) Corrects the difference in the readings between probes when multiple probes are used for measurement.
• When user calibration is performed, the color is set to the same calibration channel as its target at the same time.
Targets become the base color for displaying how different another measurable color is, which is used as the base for
color difference display.
When multiple probes are used
When using multiple probes for measurement, you can correct the difference in the readings by performing user calibration
as follows:
When the target color value for the display to be measured is known
Make a standardized color display on a standard display and perform user calibration for all probes.
When the target color value for the display to be measured is not known
(1) Determine one master probe.
(2) Set the measurement mode to xyLv mode, make the master probe face perpendicular to the display on which the target
color is displayed, and perform measurement.
(3) Record the measured value.
(4) Using the display on which the target color is displayed and the value displayed in (3), perform user calibration for other
probes.
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