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category： Resistance Meters
Surface resistivity survey meter for 1D VES Vertical Electrical Sounding
Geological Instrument
The theory and field methods used for resistivity surveys are based on the use of direct current, because it allows greater depth of investigation than alternating current and because it avoids the complexities caused by effects of ground inductance and capacitance and resulting frequency dependence of resistivity.
Resistivity surveys are made to satisfy the needs of two distinctly different kinds of interpretation problems: (1) the variation of resistivity with depth, reflecting more or less horizontal stratification of earth materials; and (2) lateral variations in resistivity that may indicate soil lenses, isolated ore bodies, faults, or cavities. For the first kind of problem, measurements of apparent resistivity are made at a single location (or around a single center point) with systematically varying electrode spacings. This procedure is sometimes called vertical electrical sounding (VES), or vertical profiling. Surveys of lateral variations may be made at spot or grid locations or along definite lines of traverse, a procedure sometimes called horizontal profiling.
Application:
The resistivity survey meter is a new generation DC electric method instrument developed by combining Chinese situation and referring to other advanced electric instrument of foreign countries. It is based on our design and manufacture experience of many years, and we consider user’s latest needs. It is of mutil-function, high accuracy, high speed, high reliability and other excellent function of extension. The instrument can be extensively applied in metal and nonmetal mineral resources detection, city geophysical exploration, railway and bridge exploration, and other application. It is also applied in hydrologic geology and engineering geology such as searching for ground water, locate the base of a dam and hidden trouble of flood protection levee, and can still used for geothermal prospecting.
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