Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1993-04-08
1996-01-02
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324714, 73765, G01B 718
Patent
active
054812011
ABSTRACT:
A circuit for generating a linear current proportional to the displacement of the movable member of a transducer receives an undetermined supply voltage from a monitoring circuit which has a relatively high internal resistance. The circuit is provided with two parallel current paths with one path including a resistive potentiometer strip and other path including a transistor and resistor connected in series. The movable member of the transducer has an electrical contact member attached thereto with the contact member having one end making contact with the resistive potentiometer strip and with the other end thereof making contact with a conductive strip which is connected to the gate of the transistor so that the current drawn by the circuit will be linearly related to the movement of the movable member.
REFERENCES:
patent: 3906338 (1975-09-01), Grindheim
patent: 4362060 (1982-12-01), Okayama et al.
patent: 4419620 (1983-12-01), Kurtz et al.
patent: 4492122 (1985-01-01), Dimeff
patent: 4550611 (1985-11-01), Czarnocki
patent: 5122756 (1992-06-01), Nelson
Kelly Robert S.
Tobin Christopher M.
Wieder Kenneth A.
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