G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 27/08 (2006.01) G01R 31/00 (2006.01)
Patent
CA 2072980
An automated test system (10) makes voltage and resistance measurements. A breakout cable (34) is connected between the vehicle electronic control module (30) and the vehicle sensors and controls (32). Resistance measurements are made between a selected pair of connector pins of the breakout cable (34) by connecting a current loop (50) which includes a power supply (56) and a known resistance (R1, R2) through a first multiplexing circuit (70, 72) to the selected pair of pins. A voltage measuring circuit (52) measures voltage across the known resistance (R1, R2) and between the pair of pins. The voltage measuring circuit (52) includes a second multiplexing circuit (82, 84) and a voltmeter (86, 88, 90, 92). The second multiplexing circuit (82, 84) receives inputs from the various pins, as well as from opposite sides of the known resistance (R1, R2) in the current loop (50). The second multiplexing circuit (82, 84) provides its output to the voltmeter (86, 88, 90, 92) for measurement. By measuring the voltage across the known resistance (R1, R2), and the voltage between the selected pair of pins, the resistance between the two pins can be derived.
Marino Joseph A.
Niemetschek Raymond H.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Spx Corporation
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