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earth resistivity here in egypt is higher, what shall i do to get 1 ohms resistivity

2007-11-22 00:57:12 · 3 answers · asked by Anonymous in Science & Mathematics Earth Sciences & Geology

3 answers

Resistivity readings can vary widely depending upon local conditions. If there is saline water in the soil, resistivity will drop, although I do not think to one ohm. That is such a low reading that it falls within experimental error and should be discounted. Perhaps you need to calibrate your equipment. Resistivity readings can be checked with conductivity readings, since resistivity is the inverse of conductivity. A reading of 1 ohm is the same as a conductivity of 1 mho. Resistivity is measured by driving two metal rods into the ground a certain length apart and measurring the resistance while conductivity is measured (I think, but I am not a geophysicist) by inducting a current into the ground.

2007-11-22 08:27:02 · answer #1 · answered by Amphibolite 7 · 0 0

To test earth resistivity, connect the ground tester as shown below.
As you can see, four earth ground stakes are positioned in the soil in a straight line, equidistant from one another. The distance between earth ground stakes should be at least three times greater than the stake depth. So if the depth of each ground stake is one foot (.30 meters), make sure the distance between stakes is greater than three feet (.91 meters). The Fluke 1625 generates a known current through the two outer ground stakes and the drop in voltage potential is measured between the two inner ground stakes. Using Ohm's Law (V=IR), the Fluke tester automatically calculates the soil resistance.
Because measurement results are often distorted and invalidated by underground pieces of metal, underground aquifers, etc. additional measurements where the stake's axis are turned 90 degrees is always recommended. By changing the depth and distance several times, a profile is produced that can determine a suitable ground resistance system.
earth resistivity measurements are often corrupted by the existence of ground currents and their harmonics. To prevent this from occurring, the Fluke 1625 uses an Automatic Frequency Control (AFC) System. This automatically selects the testing frequency with the least amount of noise enabling you to get a clear reading.
https://www.electrikals.com/

2015-08-27 00:34:16 · answer #2 · answered by john 4 · 0 0

pour water over your electrodes and the ground you stick them in, cat litter also helps.
hope that was what you were aiming for :\

2007-11-22 06:57:19 · answer #3 · answered by Anonymous · 0 1

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