Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1983-06-27
1985-12-10
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
324 51, 340573, 340652, 340658, 361 42, G01R 3102
Patent
active
045583099
ABSTRACT:
A monitor for sensing any break in electrical continuity between a body and earth when the body is coupled to earth by way of a grounding tether used to prevent build-up of static charges on such body. The monitor includes an oscillator circuit for generating A.C. output voltages which are adapted to actuate an alarm. Body capacitance and resistance are coupled by way of the tether across an impedance network either in the tuned circuit determining oscillator frequency or in the output load thereof whereby the resistance or inductance of the impedance network provides the path to ground for the body through its tether. With body capacitance and resistance components of the total impedance, variable elements in the impedance network are adjusted to diminish the circuit output voltage below the threshold voltage required to actuate the alarm when continuity exists while developing an output voltage level sufficient to actuate the alarm when a break in continuity occurs.
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Bilker Stanley
Mullen Jr. Thomas J.
Rowland James L.
The Simco Company, Inc.
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