Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1985-09-11
1987-04-28
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
G01R 1152, G01R 2726
Patent
active
046617680
ABSTRACT:
A signal generating circuit useful in determining the value of a capacitor includes a charging source having a resistive element and a plurality of switches, each switch being positionable between a first, open position and a second, closed position in response to logic signals. The switches are thereby controllable for sequentially connecting a first reference capacitor of known value and a second capacitor to the resistive element for charging said capacitors to a potential. An oscillating comparator network establishes a trigger reference voltage and generates a clocking pulse when the sequentially detected charge potential of the capacitors is equal to the trigger reference voltage. A logic network is connected to the comparator network for generating the logic signals in response to the clocking pulse and the logic network includes a network for resetting the signal generating circuit. Also included is means for determining a first time required to charge the first capacitor from an initially-depleted state to the trigger reference voltage and for determining a second time required to charge the second capacitor from an initially-depleted state to the trigger reference voltage. A method for determining the value of a capacitance is also disclosed.
REFERENCES:
patent: 3460032 (1969-08-01), Bement et al.
patent: 3824459 (1974-07-01), Uchida
patent: 4065715 (1977-12-01), Jaffe et al.
patent: 4153873 (1979-05-01), Grindeheim
patent: 4187460 (1980-02-01), Dauge et al.
patent: 4227419 (1980-10-01), Park
patent: 4492916 (1985-01-01), Johnson
Jochman Joseph J.
Johnson Service Company
Krawczewicz Stanley T.
Shupe Larry L.
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