Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – With auxiliary means to condition stimulus/response signals
Patent
1994-06-21
1996-07-02
Regan, Maura K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
With auxiliary means to condition stimulus/response signals
327 77, G01R 2702
Patent
active
055326021
ABSTRACT:
The invention concerns a diagnostic circuit for amperometrically determining the current passing through a sensor (41). The circuit comprises a current source (V+, 46) for passing a constant DC current through said sensor (41), switching means (45) for selectively operating said current source, comparing means (42) for comparing the potential difference (V.sub.BS) across said sensor to a reference voltage (V.sub.ref), and producing a control signal (D) control means (44) for controlling said switching means (45) in response to said control signal (D), and timing means (48,49) for measuring the cumulative time during which said switching signal (Q) has said first logic level during a selected time interval, so as to provide an output signal (50) indicative of a mean value of current (I.sub.bs ave) passing through said sensor (41).
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Asulab S.A.
Regan Maura K.
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