Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1986-12-11
1988-05-10
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 60C, G01R 2726
Patent
active
047438371
ABSTRACT:
A capacitance measuring circuit operating by the principle of switched capacitors includes a switchover device which alternately and periodically with a predetermined switchover frequency connects the measured capacitance for charging to a constant voltage and for discharging to a storage capacitor whose capacitance is large compared with the measured capacitance and whose terminal voltage is held substantially at a constant reference potential by a controlled discharge current. The magnitude of the discharge current is then proportional to the measured capacity and represents the measured value. A further switchover device applies a shield associated with the measured capacitance with the switchover frequency periodically and alternately to potentials which correspond substantially to the constant voltage and reference potential respectively. As a result, the potential of the shield is caused to follow the potential of the electrode to be shielded in accordance with the principle of "active shielding".
REFERENCES:
patent: 2923880 (1960-02-01), Mayes
patent: 3781672 (1973-12-01), Maltby et al.
patent: 3886447 (1975-05-01), Tanaka
patent: 4187460 (1980-02-01), Dauge et al.
Elektronik, 1980, No. 21, pp. 67-70.
Wireless World, May 1981, pp. 31-41.
Electronic Engineering, Feb. 1981, pp. 23-25.
Eisenzopf Reinhard J.
Flowtec AG
Harvey Jack B.
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