Checker box of wrist-strap monitoring

Details Checker box of wrist-strap monitoring Checker box of wrist-strap monitoring

1998-01-05

1999-09-14

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 3405731, 324509, 361212, G08B 2100

Patent

active

059529318

ABSTRACT:
A wrist-strap monitoring system includes a first wrist-strap monitoring circuitry and a second wrist-strap monitoring circuitry. The first wrist-strap monitoring circuitry is used to monitor continuously impedance of a first human body to be between an upper level and a lower level. The second wrist-strap monitoring circuitry is used to monitor continuously impedance of a second human body to be between the upper level and the lower level. A logic circuit is responsive to the first and second wrist-strap monitoring circuitry for generating an alarm signal. A sound device is responsive to the alarm signal for generating an audible signal. Further, there is provided a ground detection circuit operatively connected to a ground connection for monitoring continuity of the ground connection.

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patent: 5422630 (1995-06-01), Quinn et al.
patent: 5519384 (1996-05-01), Chanudet et al.
patent: 5686897 (1997-11-01), Loh

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