Work station monitor

Details Work station monitor Work station monitor

1989-07-06

1991-10-15

Pellinen, A. D.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

340652, 324538, 324705, 324713, G01R 3102, H05F 302

Patent

active

050579657

ABSTRACT:
A device for monitoring the grounding characteristics of both an electrically dissipative work surface and a conductive wrist strap having a grounding tether. The device includes a mat monitor and a strap monitor. The mat monitor checks the resistance of the mat ground path and alerts the user if this resistance exceeds a predetermined resistance. The strap monitor checks the resistance of the wrist strap and tether ground path, and employs a timer to send electrical pulses to the wrist strap rather than having a constant voltage output to the strap. The strap monitor establishes a resistance window for the strap ground path, and alerts the user if the strap ground path resistance falls outside of the resistance window.

REFERENCES:
patent: 4398277 (1983-08-01), Christiansen et al.
patent: 4558309 (1985-12-01), Antonevich
patent: 4580188 (1986-04-01), Brown et al.
patent: 4605984 (1986-08-01), Fiedler
patent: 4638399 (1987-01-01), Maroney et al.
patent: 4639825 (1987-01-01), Breidegam
patent: 4649374 (1987-03-01), Hoigaard
patent: 4710751 (1987-12-01), Webster
patent: 4720764 (1988-01-01), Lucas
patent: 4745519 (1988-05-01), Breidegam
patent: 4785294 (1988-11-01), Campbell
3M Circular entitled "716 Wrist Strap" Tester, published in Jan., 1989.

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