Multi-Calibration Function; Manual Select Calibration Function; Using Multiple Instruments - Konica Minolta CR-400 Instruction Manual

<Multi-Calibration Function>
The multi-calibration function is used to correct the assigned value using the calibration data in all the
set calibration channels. It is therefore effective in providing an appropriate correction not only for the
vicinity of the calibration target point but also for the value around it.
However, since the correction effect becomes smaller for colors further from the calibration target
point, more effective correction can be achieved by selecting a calibration target color which envelops
the color to be measured.
This function is useful in the following cases.
1) When measuring many different colors
The narrower the region where the calibration target point is placed is, the greater the multi-calibra-
tion effect is.
2) When measuring only certain colors
Setting the optional calibration target color to envelope the color to be measured will achieve a
greater multi-calibration effect.
Multi-calibration corrects the measurement value using the calibration data for all set cali-
bration channels. After measuring using the multi-calibration function, adding to or chang-
ing the calibration channels will create a discrepancy with the measurement value, even if the
same specimen is measured. Note also that color difference target color values which are
corrected during measurement do not change thereafter.
Even more accurate correction can be achieved by creating a list of target colors for the same material
as the measurement specimen and calibrated by the master body.
<Manual Select Calibration Function>
The manual select calibration allows the user to select any calibration channel to correct assigned
values using only that calibration data in that calibration channel.
A list of the target colors for calibration should be made for the same material as the measurement
specimen and attached to the master body.
This function is useful in the following cases.
• When measuring only the same hue
In this case, it is possible to select a color for the user calibration target color which is similar to the
measured color.
<Using Multiple Instruments>
It is possible to minimize the difference (inter-instrument agrement) in the assigned values between
instruments by performing optional calibration as described below, when using multiple instruments.
• When there is a target specimen which is already valued and which is close to the color of the
specimen to be measured.
1) Perform user calibration all bodies with the target specimen using the data for the target speci-
men which is already valued.
• When there is not a target specimen which is already valued and which is close to the color of the
specimen to be measured.
1) Select a master body.
2) Measure a specimen which is close to the color to be measured using the master body.
3) Perform user calibration all other bodies with that specimen. (Calibration data uses measurement
data by the master body.)
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