Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1992-05-20
1994-07-12
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324679, G01R 2726
Patent
active
053292391
ABSTRACT:
A measuring circuit for measuring a capacitance according to the discharge method includes a measuring circuit input. A constant voltage source charges a capacitor to be measured at the measuring circuit input. The capacitor discharges through a discharge resistor with a known resistance being connected to the capacitor. At least one switch is connected between the capacitor and the constant voltage source. A flow control is connected to the at least one switch for controlling the at least one switch. A comparator is connected to the capacitor. A counter is connected to the comparator for counting clock pulses during a discharge. A PTC element is connected to the measuring circuit input in series with the capacitor. A monitoring device is connected to the capacitor.
REFERENCES:
patent: 2601491 (1952-06-01), Baker
patent: 3761805 (1973-09-01), Dornberger
patent: 3824459 (1974-07-01), Uchida
patent: 4217543 (1980-09-01), Strong
patent: 4429271 (1984-01-01), Doubek et al.
patent: 4743837 (1988-05-01), Herzog
patent: 4825147 (1989-04-01), Cook et al.
patent: 4870528 (1989-09-01), Harford
patent: 5038245 (1991-08-01), Gronskog
patent: 5073757 (1991-12-01), George
Kindermann Robert
Styhler Klaus
Ziegler Herbert
ABB Patent GmbH
Brown Glenn W.
Greenberg Laurence A.
Lerner Herbert L.
Wieder Kenneth A.
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