Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – In vehicle wiring
Patent
1988-06-06
1989-11-28
Shoop Jr., William M.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
In vehicle wiring
324524, 324542, 324384, 340653, 340660, G01R 3102
Patent
active
048840335
ABSTRACT:
A test module incorporating a unique diagnostic circuit for monitoring the magnitude of electrical parameters existing between an electrical driver such as the electronic control module (ECM) of an automotive vehicle and an electrical load in the vehicle's electrical system. The circuit employs a visual indicator connected to a point adjacent the driver to provide a visual signal when the voltage at the point of connection lies within a predetermined range with respect to electrical ground. An additional visual indicator, separate from the first, is connected to a point adjacent to the electrical load, and provides a visual signal when the voltage at its point of connection lies within a predetermined range with respect to electrical ground. A third visual indicator is connected between the driver and load, and provides a visual signal in response to current flowing between the driver and load. The third visual indicator has a positive temperature coefficient of impedance whereby it presents a relatively low electrical impedance when experiencing relatively low current flow, and exhibits a higher impedance upon experiencing increased current flow.
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Lehmann H. Gibner
Lehmann K. Gibner
Shoop Jr. William M.
Williams H. L.
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