Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1996-08-08
1999-06-29
Snow, Walter E.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324672, G01R 1900, G01R 2726
Patent
active
059173149
ABSTRACT:
A device for locating the edges of wall studs includes a comparison circuit connected to each of three capacitive elements. As the device is moved along a wall, the comparison circuit monitors the relative charge time associated with each capacitive element, the charge times providing an indication of the relative capacitances of the three capacitive elements. Changes in the relative capacitances of the three elements as the device is moved along a wall are due to a change in the dielectric constant of the wall, which normally results from the presence of a wall stud behind the surface over which the device is moved. The comparison circuit uses differences in the measured relative capacitances of the first, second, and third capacitive elements to locate the edges of the stud.
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Dodd Paul W.
Heger Charles E.
Klivans Norman R.
Snow Walter E.
Zircon Corporation
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