DIAGNOSTICS AND AUTOMATIC CALIBRATION OF INSTRUMENTS FOR CONTROL OVERTHE COMPOSITION OF SUBSTANCES

Specific features of eight types of linear calibration by two measured signals that are used for determining the concentration are described . It is shown that the calibration characteristic must pass through th e centers of ellipses of equal probability density of signal dispersio n at concentrations differing for different ellipses, but kept constan t within each ellipse. The diagnostics of the operation of a measuring instrument is carried out by the indication of the sign and the value of the dispersion of a pair of signals about the calibration characte ristic. Automatic calibration is performed at regular intervals by the grouping method using signals measured for each of three equal groups . As a result, the measuring instrument always operates using the last corrected automatic calibration characteristic.