Electrical resistance monitoring device
First Claim
1. A device for indicating whether a conductive element has an electrical resistance equal to or less than a predetermined value or whether the conductive element is reliably connected to earth reference potential by a resistance equal to or less than a predetermined value, said device comprisinga clamp device for connecting said device to the conductive element;
- wherein said clamp device incorporates a battery powered monitoring unit comprising a current-to-voltage converter with a voltage output that is inversely proportional to the resistance of the conductive element;
a comparator which compares at predetermined intervals said voltage output to a pre-set reference, and determines whether the measured resistance is equal or less than the predetermined value; and
a signaling device which is actuated to provide an indication as to whether the measured resistance is equal to or less than the predetermined value, the predetermined value of the measured resistance being in the range 1-100 Ohms.
1 Assignment
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Accused Products
Abstract
A device for indicating whether a conductive element has an electrical resistance equal to or less than a predetermined value or whether the conductive element is reliably connected to earth reference potential by a resistance equal to or less than a predetermined value. The device includes a clamp device for connecting the device to the conductive element and which incorporates a battery powered monitoring unit. The monitoring unit includes a current-to-voltage converter with a voltage output that is inversely proportional to the resistance of the conductive element, a comparator which compares at predetermined intervals voltage output to a pre-set reference and determines whether the measured resistance is equal or less than the predetermined value, and a signaling device which is actuated to provide an indication as to whether the measured resistance is equal to or less than the predetermined value.
17 Citations
13 Claims
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1. A device for indicating whether a conductive element has an electrical resistance equal to or less than a predetermined value or whether the conductive element is reliably connected to earth reference potential by a resistance equal to or less than a predetermined value, said device comprising
a clamp device for connecting said device to the conductive element; -
wherein said clamp device incorporates a battery powered monitoring unit comprising a current-to-voltage converter with a voltage output that is inversely proportional to the resistance of the conductive element;
a comparator which compares at predetermined intervals said voltage output to a pre-set reference, and determines whether the measured resistance is equal or less than the predetermined value; and
a signaling device which is actuated to provide an indication as to whether the measured resistance is equal to or less than the predetermined value, the predetermined value of the measured resistance being in the range 1-100 Ohms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification