Saturday 5 March 2022

Measurement of Earth resistivity

Earth tester is used for the measurement of resistivity. As shown, instrument reads the resistance directly. The most frequently used earth tester is the four point method .The resistivity is calculated from equation as given below:
P=2πSR, where • P = Resistivity of soil in ohm-meter • S = Distance between successive electrodes in meter. • R = earth tester reading in ohms. The Four electrodes are driven into the earth along a straight line in a chosen direction at equal spacing (formula may not be successful on unequal spacing). The depth of electrodes in the ground is taken generally 6”.The earth tester is placed on even surface. The link between terminals P1 and C1 is opened and the four electrodes are connected to the instrument terminals. An approximate range on the instruments is then selected to obtain clear readings, avoiding the two ends of the scale as far as possible. Reading are taken and averaging is done using the formula.
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