Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1987-09-04
1989-06-06
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 57R, 324DIG1, G01R 2702
Patent
active
048375012
ABSTRACT:
An apparatus for measuring differential impedances which incorporates a CMOS timer in place of the sine wave generator in a typical AC bridge configuration. A toroidal signal transformer having its primary and secondary windings tightly twisted together and wound around the core lessens temperature drift characteristics. The differential bipolar current signal provided by the secondary winding is passed through an AC to DC converter which is switched by a field effect transistor, thereby eliminating the need for prior art inverter comparator circuits. Finally, by use of a bandpass filter after the signal transformer and by insertion of a capacitor before the AC to DC converter, the need for the active filter stage used in the prior art is eliminated.
REFERENCES:
patent: 4242665 (1980-12-01), Mate
patent: 4672322 (1987-06-01), Gratteau et al.
Fry John J.
Smith Robert A.
Edwards Robert J.
Eisenzopf Reinhard J.
Matas Vytas R.
Miele Anthony L.
The Babcock & Wilcox Company
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