Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1984-08-24
1986-10-21
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324DIG1, G01D 100
Patent
active
046188185
ABSTRACT:
An evaluation circuit for a passive measurement variable pickup having resistor sensors disposed in a bridge circuit is disclosed. In one embodiment, a double throw switch alternately connects a balancing resistor across resistors of the bridge circuit. A balancing difference signal is generated by a preamplifier coupled to the output of the bridge circuit. The preamplifier transmits d-c components of the balancing difference signal. The output of the preamplifier is coupled to a phase sensitive rectifier. The preamplifier has a linear phase frequency response and a linear modulation characteristic. The output of the rectifier is coupled to a null amplifier and the balancing resistor is coupled to a polarity reversing switch feeding the bridge circuit by circuitry which passes d-c components, e.g., a conductor, an operational amplifier or a switching device.
REFERENCES:
patent: 3588690 (1971-06-01), Griffin
patent: 3875501 (1975-04-01), Hayashi
patent: 3944819 (1976-03-01), Sherwood
Eisenzopf Reinhard J.
Siemens Aktiengesellschaft
Solis Jose M.
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