Method for correcting a signal delivered by a measuring instrument

Method for correcting a signal delivered as a result of an analysis of a characteristic of a test product by a slave measuring instrument, said method comprising:

• establishing a calibration model for a master measuring instrument of a same type as the slave measuring instrument on the basis of a plurality of calibration products each being of a same type as the test product and having a known calibration characteristic;
• using said slave measuring instrument and said master measuring instrument of the same type to deliver slave standardization signals and master standardization signals as to each of the calibration products;
• performing a series decomposition of each of the master instrument and slave instrument standardization signals delivered respectively by the master and slave instruments for each of the calibration products;
• establishing mathematical relationships between parameters resulting from the series decompositions of the master and slave standardization signals;
• using the established mathematical relationship to determine correction coefficients for the parameters resulting from the series decomposition of the slave standardization signals delivered from the slave instrument with respect to similar parameters resulting from the series decomposition of the master standardization signals delivered from the master instrument for each calibration product;
• storing the correction coefficients in the form of a correction matrix;
• using the slave instrument to analyze a test product;
• performing a series decomposition of a resulting test product signal delivered by the slave instrument;
• correcting coefficients resulting from the series decomposition of the signal delivered by the slave instrument using the stored correction matrix;
• using the corrected coefficients in recomposing a corrected version of the signal delivered by the slave instrument analyzing the characteristic of the test product;
• and
• determining the desired characteristic of the test product analyzed by the slave instrument by applying the calibration model to the corrected version of the signal delivered by the slave instrument.