# Earth Resistance/Resistivity/Measurement Method

2016-03-17 12:13:43 0

Earth Resistivity

 Earth Resistivity Principle of Earth Resistivity(ρ)MeasurementAccording 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 MethodStick 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)The supplied Test Leads can be used for the distance between the spikes up to 20m.Connection for Earth Resistivity Measurement Earth Resistance

 Principle of Earth Resistance MeasurementThis instrument makes earth resistance measurements with fall-of-potential method, which is a method to obtain earth resistance value "Rx" by applying AC constant current "I" between the measurement object "E" (earth electrode) and "H(C)" (current electrode), and finding out the potential difference "V" between "E" (earth electrode) and "S(P)" (potential electrode). Simplified Measurement (2-Wire)2-Wire Earth Resistance Measurement Precise Measurement (3-Wire)3-Wire Earth Resistance Measurement Precise Measurement (4-Wire)4-Wire Earth Resistance Measurement 