Power outlet ground integrity and wriststrap monitor circuit
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United States of America Patent
Stats
-
Sep 24, 1991
Grant Date -
N/A
app pub date -
Aug 29, 1988
filing date -
Aug 29, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plug-mounted wriststrap detector and ground monitor includes hot, neutral and ground input terminals which are connected to corresponding terminals of a power outlet when the circuit is plugged in. A jack is provided to plug a wriststrap into the circuit to provide electrostatic protection to the user. Means are provided to detect that the user is wearing the wriststrap and that the wriststrap is properly connected to the circuit as a function of whether an a.c. signal of sufficient amplitude is detected coupled to the circuit by the wriststrap and/or user. Lamps and an audible alarm warn the user if the wriststrap is not properly connected. A precision ground integrity circuit is provided to detect whether an unsafe ground condition exists and to alert the user accordingly. The ground integrity circuit uses a constant current source and voltage comparator to determine that the ground impedance does not exceed a predetermined limit.
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Family
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