Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1989-04-14
1990-11-06
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324649, 324672, 324679, G01R 2726
Patent
active
049689460
ABSTRACT:
Apparatus and method for determining capacitive and resistive values of an electrical component, such as a fuel level determining probe, includes a waveform generator for subjecting the probe to a time-varying waveform that includes a linearly varying ramp portion and a fixed, constant portion. A selectively controlled sample and hold circuit senses the voltage potential of the probe in response to a zero-crossing detector during the linearly varying ramp portion of the waveform to provide information indicative of the capacitive value and again senses the voltage potential at selected time thereafter during the fixed portion of the waveform to provide resistive value information. The output of the sample and hold is provided to an analog-to-digital converter which provided digital information to a stored-program controlled processor which provides the desired output information. In one form of the invention, a calibration standard is periodically switched into the circuit to provide reference values for comparison against the measured values.
REFERENCES:
patent: 3530379 (1970-09-01), Demerliac
patent: 4080562 (1978-03-01), Rubel et al.
patent: 4426616 (1984-01-01), Maier
patent: 4820973 (1989-04-01), Alvarez
Eisenzopf Reinhard J.
Lovercheck Dale R.
Mueller Robert W.
Simmonds Precision Products Inc.
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