Electricity: electrical systems and devices – Discharging or preventing accumulation of electric charge
Patent
1984-09-28
1986-04-01
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Discharging or preventing accumulation of electric charge
324 51, 324 63, 324133, 361220, H05F 302
Patent
active
045801886
ABSTRACT:
The continuity of a ground strap (16) is tested by pushing down on a switch activating toggle lever (37). The toggle lever is conductive, is isolated from ground and is coupled to a signal input terminal of a test circuit module (14). Thus, when the hand of the operator touches the toggle lever to activate the test circuit module (14), the resistive path through the operator and the ground strap (16) is coupled into the test circuit as the input-terminal-to-ground resistor of a voltage divider circuit. A resulting voltage at the toggle lever causes an indication by lighting either indicator (33) or indicator (34) whether the operator is properly coupled to ground.
REFERENCES:
patent: 3848185 (1974-11-01), Hentschel
patent: 3963981 (1976-06-01), Vis
patent: 4366434 (1982-12-01), Ellis
patent: 4373175 (1983-02-01), Mykkanen
J. R. Huntsman et al., "Test Methods for Static Control Products," Electrical Overstress/Electrostatic Discharge Symposium Proceedings, Orlando, FL, Sep., 1982.
ESD Product Description, Evaluation Engineering, Oct., 1983, p. 82, last paragraph.
ESD Products, "Resistance Interval Meter Tests Wrist Straps," Evaluation Engineering, Oct., 1983, p. 88.
Application Note, Electronics Test, Mar. 1984, p. 148.
Brown David F.
Jones Joseph L.
Melatti Livio R.
Sullivan David C.
Wilkinson, Jr. George F.
AT&T - Technologies, Inc.
Moose Jr. Harry E.
Schellin W. O.
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