Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Calibration
Patent
1996-01-30
1997-12-16
Brown, Glenn W.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Calibration
324 74, 324 7615, 36457101, G01R 3500
Patent
active
056989849
ABSTRACT:
An adaptive digital filter is provided to obtain improved measurement accuracy in an electronic instrument which has a front-end circuit for coupling to an input signal to be measured. An analog to digital converter converts the input signal received through the front-end circuit into a stream of measurement values during the measurement phase. The stream of measurement values are then provided to the adaptive digital filter which mathematically operates on them to remove the frequency response effects of the front-end circuit in a process of convolution in the time domain using a set of digital filter values obtained during the calibration phase. Because the frequency response requirements of the front-end circuit have been eased with the addition of the adaptive digital filter, a simpler front-end circuit with fewer components and with no need for manual adjustment may be employed in electronic instruments.
REFERENCES:
patent: 5463893 (1995-11-01), Pla et al.
patent: 5557267 (1996-09-01), Poduje et al.
patent: 5594612 (1997-01-01), Henrion
Gibson Greg S.
Little Erik R.
Swift Steven D.
Barker Douglas J.
Brown Glenn W.
Fluke Corporation
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