Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1991-05-22
1992-10-13
Harvey, Jack B.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324 66, G01R 1900, H04B 346
Patent
active
051554402
ABSTRACT:
A hand-held apparatus for testing cable harness for faults and performance impairments comprises three sets of voltage references, CMOS comparator circuitry, programmable DIP switches, an LED status display for error detection, an LED for indication of overall system condition, and a power source. The voltage dividers are utilized to determine reference voltages; each voltage divider comprises a resistor pair. In the preferred embodiment a first set of voltage references is utilized for checking open conditions and is generally associated with odd-numbered wires in the cable harness. A second and a third set of voltage references may be employed for all types of testing, with the second set of voltage references being generally associated with odd-numbered wires and the third set of voltage references being generally associated with even-numbered wires. The voltage references provide the CMOS logic level for a plurality of CMOS comparators in a VLSI gate array are linked to a status display and respond to variations in reference voltage. Each set of voltage references utilize large resistance values to decrease power consumption so that a 9V battery with an associated 5V regulator may be used in the preferred embodiment.
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IBM Technical Disclosure vol. 16 No. 12 May, 1974 Cable Tester Formica 324 (66).
Harvey Jack B.
Pressman David
Regan Maura K.
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