Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1978-04-28
1979-09-25
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
73362AR, G01R 2702
Patent
active
041692438
ABSTRACT:
This relates to a circuit for generating a voltage which is proportional to changes in the resistance of a remote resistive sensing element, due to, for example, changes in temperature, pressure (such as from a strain gauge), etc. The sensing element is coupled to the circuit by three lead wires each having lead wire resistance. Means including first and second operational amplifiers are provided for cancelling errors in the output voltage due to voltage drops in the lead wires.
REFERENCES:
patent: 3437925 (1969-04-01), Gillette
patent: 3503261 (1970-03-01), Riester et al.
patent: 3817104 (1974-06-01), Sapir
patent: 3924470 (1975-12-01), Sander
patent: 4000454 (1976-12-01), Brakl
patent: 4060715 (1977-11-01), Scott
patent: 4109196 (1978-08-01), Carmody
Molloy John J.
Payne Francis L.
Burr-Brown Research Corp.
Krawczewicz Stanley T.
Weiss Harry M.
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