Wrist strap ground monitor

Details Wrist strap ground monitor Wrist strap ground monitor

1985-10-04

1987-01-20

Hix, L. T.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

Specific conduction means or dissipator

340649, 340652, 340658, 324 51, H05F 302, A61N 114, G01R 3102

Patent

active

046383999

ABSTRACT:
Apparatus which can be embodied in an electronic wristwatch monitors the integrity of a wrist strap ground. An input terminal to which a known ground is coupled is provided. An oscillator produces a fixed frequency which is mixed with a signal from the input terminal to provide a composite signal. The composite signal is coupled to one input of an exclusive OR-gate. The other input of the exclusive OR-gate is coupled directly to the output of the oscillator. The output of the OR-gate is processed to produce an output signal indicative of the phase relationship between the oscillator output and the composite signal. When the input terminal is grounded, the phase relationship between the oscillator output and the composite signal changes, resulting in a change in the output signal which can be used to trigger an indicator (e.g., visual display and/or aural alarm) to indicate to a user whether he or she is properly grounded.

REFERENCES:
patent: 3706008 (1972-12-01), Kremer
patent: 3755688 (1973-08-01), Hohler
patent: 3774106 (1973-11-01), MacPhee
patent: 3783340 (1974-01-01), Becker
patent: 3784842 (1974-01-01), Kremer
patent: 4475141 (1984-10-01), Antonevich
patent: 4558309 (1985-12-01), Antonevich

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