| 摘要 |
PROBLEM TO BE SOLVED: To reduce a measuring time necessary for automatic calibration by performing the measuring only one time with a reference sample at one proper point or several points on a calibration curve in steal of preparing the calibration curve again, and judging the completion of the calibration depending on whether the result is significantly separated from data at the time of previous calibration. SOLUTION: At a calibration time, a reference sample is measured once. Judgment is performed on whether the one time measurement data is in a first allowable range for data at the time of the previous calibration. If they are in the range, it is judged that they are not separated significantly therefrom, and any further measurement is not performed, and a calibration curve made by the measured data at the time of the previous calibration is used continuously. If they are out of the range, the two-time additional measuring is repeated with regard to the reference sample. Standard deviation(SD) and a coefficient of variation(CV) are calculated on the total three- time measured data. CV(%)=DS×100/average value is expressed. If SD and CV are in a set second allowable range, the total three-time average values are calculated, the result in compared with the calibration data at the previously time, and the previous calibration curve is used from within the range.
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