Method and measuring electronic instrument accuracy is enhanced to improve the measurement accuracy in an electronic instrument

摘要

PROBLEM TO BE SOLVED: To provide the method for improving the measurement accuracy in an electrical appliance by using an adaptive digital filter. ;SOLUTION: An A/D converter 116 converts an input signal 112 received via a front end circuit 114 into a series of measured values for the measurement stage. A series of the measured values is given to an adaptive digital filter 117, which calculates the measured values mathematically and one set of digital filter values obtained for a calibration stage are used to eliminate the effect by a frequency response of the front end circuit 114 in the convolution process for a time region. Since the condition of the frequency response of the front end circuit 114 is reduced by adding the adaptive digital filter 117 to the method, the simple front end circuit 114 having a fewer components and not needing manual adjustment is used to an electronic appliance 110.;COPYRIGHT: (C)1997,JPO