Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication
Patent
1997-05-16
1999-02-16
Do, Diep N.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of ground fault indication
324457, 324510, 361220, 340649, G01R 3102, G08B 2100, H05F 302
Patent
active
058724559
ABSTRACT:
Improved electronic circuitry incorporated into a tag attached to a user worn wrist strap of a static electrical discharge dissipation system. The electronic circuitry monitors the electrical connection of the wrist strap from the user to ground and tests the functionality of the tag. The electronic circuitry comprises an oscillator, a signal transmitter, a discharge resistor and a discharge resistor check circuit for monitoring the accuracy of the discharge resistor. The electronic circuitry also comprises a skin resistance check circuit for monitoring the electrical connection of the wrist strap to the user, and a ground fault detect circuit for monitoring the electrical connection of the wrist strap to ground. The electronic circuitry further comprises a testing circuit for checking the frequency of the oscillator, monitoring the spectrum of a signal transmitted by the signal transmitter, checking the functionality of the ground fault detect circuit, checking low and high limits of the discharge resistor, and checking the functionality of the skin resistance check circuit.
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Guthrie Warren E.
Pohribnij Walter Jerry
Trainor Michael J.
Anderson Terry J.
Do Diep N.
Hoch Jr. Karl J.
Northrop Grumman Corporation
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