Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1986-07-14
1988-04-26
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
324503, 324556, 324384, G01R 3102, G01R 1914
Patent
active
047407450
ABSTRACT:
A polarity and continuity tester of simple construction identifies grounded and positive lead wires in an automobile and is also capable of confirming proper operation of high voltage spark wires, all with one simple circuit. A tri-color light emitting diode is included in the testing device, along with a ground wire, a tester battery, a resistor and a conductive point probe, all connected in series. When the ground wire is secured to ground in the automobile, the point probe when touched to grounded conductors will cause the light emitting diode to emit a first color such as green, with current flowing through the diode in a first direction under influence of the tester battery. When the point probe is touched to a hot lead above about 5 volts, the tester battery becomes merely a conductor, current flows in the opposite direction, and the light emitting diode emits a second color such as red. If the point probe is touched to a high voltage spark wire with the automobile's engine running, current will flow in the first direction and the first color will be emitted, confirming that the coil is properly connected and properly producing spark.
REFERENCES:
patent: 4005362 (1977-01-01), Fortino
patent: 4207517 (1980-06-01), Bloxam
patent: 4366434 (1982-12-01), Ellis
patent: 4584526 (1986-04-01), Lobastov
Eisenzopf Reinhard J.
Freiburger Thomas M.
Harvey Jack B.
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