Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1994-02-24
1995-09-12
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324672, 324679, G01N 2722, G01R 2726
Patent
active
054500150
ABSTRACT:
An impedance measurement system including a series circuit having a reference impedance leg and a measurement leg, the measurement leg including first and second spaced apart electrodes defining a region for receiving a sample of material to be tested; an oscillator circuit connected in parallel with the series circuit and providing a reference voltage and a signal voltage proportioned to the impedance of the measurement leg; and a detector circuit producing an output voltage proportional to changes between the reference voltage and the signal voltage.
REFERENCES:
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patent: 4370611 (1983-01-01), Gregory et al.
patent: 4568875 (1986-02-01), Piso et al.
patent: 4845421 (1989-07-01), Howarth et al.
patent: 5068618 (1991-11-01), Fry et al.
patent: 5371469 (1994-12-01), Anderson
Mastico Robert A.
Moline Robert R.
Brown Glenn W.
Forte Technology, Inc.
Jarcho Harold G.
Toupal John E.
Wieder Kenneth A.
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