An improved electrical resistivity field system for shallow earth measurements.
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 7942, 1974 Jan; :1-20
The Bureau of Mines has developed an improved earth resistivity field system that employs a novel technique for obtaining null measurements. The instrument is designed to operate reliably in high-noise environments such as those found in the vicinity of operating mines. The system consists of a low-frequency transmitter, a sensitive receiver, and an external battery pack, each in its own case to provide protection from the elements. The receiver and transmitter units have self-contained rechargeable batteries to supply power to the circuitry and separate built-in battery charges that operate on standard 115 vac power. The system is portable and simple to operate. Measurement accuracy, reliability, and dynamic range are superior to most commercially available equipment even though less time and effort is required to make null readings. Unlike some commercial systems, long integration times are not required to enhance signal-to-noise ratio in areas of high background noise.
Mining-industry; Underground-mining; Analytical-processes; Analytical-instruments; Geology
IH; Report of Investigations
NTIS Accession No.
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 7942