Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1990-11-06
1993-01-05
Harvey, Jack B.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324503, 324384, 324378, 36443101, 36442403, G01R 2708, F02P 1700
Patent
active
051774470
ABSTRACT:
An automated test system makes voltage and resistance measurements. The breakout cable is connected between the vehicle electronic control module and the vehicle sensors and controls. Resistance measurements are made between a selected pair of connector pins of the breakout cable by connecting a current loop (which includes a power supply and a known resistance) through a first multiplexing circuit to the selected pair of pins. A voltage measuring circuit measures voltage across the known resistance and between the pair of pins. The voltage measuring circuit includes a second multiplexing circuit and a voltmeter. The second multiplexing circuit receives inputs from the various pins, as well as from opposite sides of the known resistance in the current loop. The second multiplexing circuit provides its output to the voltmeter for measurement. By measuring the voltage across the known resistance, and the voltage between the selected pair of pins, the resistance between the two pins can be derived.
REFERENCES:
patent: 2710375 (1955-06-01), Mengali
patent: 4757463 (1988-07-01), Ballou et al.
Service Bulletin, "Vehicle System Test", Ford Granada '85-Scorpio: Section 290, Feb. 1985.
EDN Magazine, Mar. 15, 1990 "Analog Switches & Multiplexers" by Doug Conner.
Machine Design Magazine, Sep. 7, 1989 by Hauge et al. entitled "How to Avoid ADC Errors in Microvolt Signals".
Evaluation Engineering Magazine, May 1990 by Paul O'Shea entitled "Continuity/Bare-Board Testing".
EDN Magazine Feb. 16, 1989 by Anne Watson Swager entitled "Crosspoint Switch ICs Enter Digital Domain".
Marino Joseph A.
Niemetschek Raymond H.
Bear Automotive Service Equipment Company
Harvey Jack B.
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