Principle of Earth Resistivity (ρ) Measurement
| According to the Wenner 4-pole method, apply AC current "I" between the "E" (earth electrode) and "H(C)" (current electrode) to find out the potential difference "V" between the two potential electrodes "S(P)" and "ES". To obtain the earth resistance "Rg (Ω)", devide the potential difference "V" by AC current "I"; where the distance between electrodes is "a" (m). Then use the formula: ρ = 2 • π • a • Rg (Ω • m). |  |
Measurement method
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Stick the four Auxiliary Earth Spikes into the ground deeply. They should be aligned at an interval of 1-30m(a). The depth should be 5% or less of the interval between the spikes. Note) |
 Connection for Earth Resistivity Measurement |