| 摘要 |
PURPOSE:To obtain a calibration constant for a calibrating point by storing the calibration constant in the form of the ratio between the calibration constant for the calibrating point and a reference calibration constant, recalibrating only the calibration constant for a reference calibrating point and calculating the calibration constant for said calibrating point based on the recalibrated calibration constant. CONSTITUTION:There are calibrating channels 0-9 and a calibrating key in a keyboard 12 is pressed to input the channel 0. That is, a reference calibrating data is prepared and tristimulus values representative of a calibrating point are inputted by the ten-keys of the keyboard 12. Then, the calibrating data are measured by operating a measuring key and a reference calibration constant is stored in a RAM 7. Then, an arbitrary channel (i) is selected from among the channels 1-9 and the calibrating data for the channel (i) are measured in the same manner to obtain tristimulus values. The tristimulus values are corrected by using the reference calibration constant and a calibration constant is obtained to be stored (7). This calibration constant is obtained in the form of the ratio between the calibration constant based on a general definition and the reference calibration constant. Accordingly, in the next calibration and thereafter, the error factors common to all the channels can be canceled only by taking the step to calibrate a reference calibrating point.
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