Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1993-03-04
1994-12-20
Wieder, Kenenth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324444, 324693, 324715, 204407, 2041531, 422 8201, 436149, G01N 2700
Patent
active
053748921
ABSTRACT:
An instrument and method for measuring chemical properties, the instrument having electrodes suitable for immersion in a chemical solution. A voltage source and a current-sensing circuit are connected to the electrodes to measure the current produced in the solution in response to a voltage applied to the electrodes to determine a value of the chemical in the solution. The instrument and method further include background compensation for offsetting the value of the analyte by an amount which is reflective of the background value of the solution. The background value is stored in an internal memory of the instrument so that when new experimental measurements are taken, the measurements are immediately offset by the background portion of the new experimental measurements. This allows operation of the instrument at high gain levels, resulting in a broad dynamic range and greater useful precision in the output signal.
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patent: 5220514 (1993-06-01), John
O'Brien Gerald E.
Sturrock Peter E.
Brown Glenn W.
Georgia Tech Research Corporation
Wieder Kenenth A.
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