G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 19/165 (2006.01) C12M 1/40 (2006.01) G01N 27/327 (2006.01) G01N 27/49 (2006.01) G01N 33/487 (2006.01) G01R 19/257 (2006.01) G01R 19/30 (2006.01) G01R 31/28 (2006.01)
Patent
CA 2126296
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 ss) across said sensor to a reference voltage (V 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 svaitching 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 bsave) passing through said sensor (41).
Asulab S.a.
Gowling Lafleur Henderson Llp
LandOfFree
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