Earth resistivity measuring instrument C313SEV

digitalfor quadrupole measurementsUSB

Digital Georesistivimeter for V.E.S.Vertical Electric Surveys. Equipment is characterized by maximum resolution and accuracy in geoelectric survey and great functioning rapidity. Once data acquisition is completed, data can be immediately processed with related data processing software. Power is supplied by embedded battery pack and it is managed through a microprocessor able to provide wide autonomy of acquisition. Recording and saving of data takes place on internal Disk or on USB key (supplied). Unit is fully computerized and all operating functions are selected simply by touching menu on color LCD monitor 7" with integrated touch screen. This type of survey is carried out with the purpose to reconstruct an electro-tomography 1D for a measurement point. The geo-electric method consists in the experimental determination of the resistivity distribution characterising the electric structure of a medium. In the SEV method, the distance between the electrodes is increased progressively and the ratio between d.d.p. and the current intensity is measured from time to time. The resistivity values thus obtained are influenced by the characteristics of the materials at increasingly greater depths. In view of this second effect, a geometric correction must be made and therefore factors that depend on distances MN (measurement electrodes) and AB (input electrodes) must be introduced in the calculation of the resistivity. According to the variations of the electrodes positions along the geo-electric area, different quadrupole systems are identified: Wenner and Schlumberger.