Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1982-03-11
1984-08-07
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
G01R 1900
Patent
active
044646224
ABSTRACT:
A portable device for locating a wall stud or similar object positioned behind a wall surface comprises means for detecting a change in the dielectric constant of the wall due to the presence of a stud or similar object and, in combination therewith, means for detecting the presence in the wall of a source of alternating current. In addition, a display is provided for visually indicating the presence of a source of alternating current in the wall in response to a signal from the means for detecting. The circuit also includes an amplifier to compensate for variations in characteristics of the electrical components used in the structure and an improved circuit for bleeding a bias charge used to calibrate the device when the device is shut off while preventing this charge from being bled when the device is turned on, and structure for indicating to the user that the device is being calibrated.
REFERENCES:
patent: 4099118 (1978-07-01), Franklin
patent: 4315218 (1982-02-01), Rankin
Maloney, "Locating Cable Faults"--IEEE Transactions on Industry, Applications--vol. IA-9, No. 4, Jul./Aug. 1973--pp. 392.
Dobkin, "OP AMP Circuit Collection", Application Note AN-31, National Semiconductors--Feb. 1970--pp. 6 & 17.
Caserza Steven F.
Krawczewicz Stanley T.
MacPherson Alan H.
Solis Jose M.
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