Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1976-11-10
1978-03-28
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
323 75N, 324 62, 324130, G01R 2702
Patent
active
040817440
ABSTRACT:
A conditioning circuit for a resistance bridge transducer that includes output signal amplification, a voltage regulated DC power source for transducer excitation and a calibration select circuit for selectively inserting a shunt calibration resistor into parallel with one bridge arm. The calibration select circuit comprises a field effect transistor switch that is connected in series with the calibration resistor between two adjacent transducer terminals. The field effect transistor switch is operated by the output of an operational amplifier in response to positive and negative DC control signals. The conditioning circuit is adaptable to miniaturization through the use of integrated and hybrid circuits.
REFERENCES:
patent: 3203223 (1965-08-01), Petrow
patent: 3209248 (1965-09-01), Siefert
patent: 3319155 (1967-05-01), Kooiman et al.
patent: 3450978 (1969-06-01), Norman
patent: 3501696 (1970-03-01), Riley
patent: 3568044 (1971-03-01), Elazar
patent: 3667041 (1972-05-01), Senour
patent: 3783692 (1974-01-01), Hansen
Krawczewicz Stanley T.
Matthews, Jr. Willard R.
Rusz Joseph E.
The United States of America as represented by the Secretary of
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