Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – With auxiliary means to condition stimulus/response signals
Patent
1989-09-29
1992-06-02
Harvey, Jack B.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
With auxiliary means to condition stimulus/response signals
324678, 324706, 324711, 73726, 341172, G01R 2702, G01L 904, H03M 112
Patent
active
051190338
ABSTRACT:
A voltage-to-digital converter comprising a storage circuit for providing a storage capacitance with a plurality of selectable magnitudes. The storage circuit provides a charge output representative of applied voltage input signals and the selected capacitive magnitude. A charge accumulation circuit is coupled to the charge output. The total charge accumulated is proportional to the integral of the amount of charge discharged from the storage circuit. The charge accumulation circuit provides a balance output representative of a comparison of the accumulated charge and a reference charge. A control circuit is coupled to the balance output for providing feedback signals as functions of the balance output for periodically charging and discharging the storage capacitance whereby a first sequence of charge packets is provided on the charge output for driving the accumulation of charge toward the reference within a first set of limits when a first capacitive magnitude is selected in the storage circuit and whereby a second sequence of charge packets is provided on the charge output for driving the accumulation of charge toward the reference charge within a second set of limits when a second capacitive magnitude is selected in the storage circuit. A calculation circuit is coupled to the feedback circuit for counting the number of charged packets generated in a measurement cycle. An output circuit provides an output indicative of the voltage input signals as a function of the number of packets counted.
REFERENCES:
patent: 4437164 (1984-03-01), Branch, III
patent: 4791352 (1988-12-01), Frick et al.
120PC Series-Excitation, Micro Switch, Application Notes, Note 3, a Division of Honeywell, Sep. 1978.
120PC Series-Null and Sensitivity Adjustment, Sensitivity Temperature Compensation, Micro Switch, Application Notes, Note 2, a Division of Honeywell, Feb. 1079.
Frick Roger L.
Schulte John P.
Harvey Jack B.
Rosemount Inc.
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