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MILHDBK419A
(2)
Following the manufacturer's instruction, obtain a resistance reading, R, with the test set.
(3)
Convert the probe spacing, A, to centimeters. (See Page xvi for metric conversion factors.)
(4)
Compute resistivity from
(in ohmcm)
= 6.26AR
(11)
Assume that a resistance of 2 ohms is measured with probe spacings of 20 feet.
EXAMPLE:
Convert 20 feet to centimeters: 20 f t x 30.5 cm/ft = 610 cm
Calculate resistivity:
= 6.25 x 610 x 2 = 7662 ohm cm
A = ELECTRODE SPACING
B = DEPTH OF PENETRATION < A / 2 0
D = DEPTH AT WHICH RESISTIVITY IS DETERMINED = A
Figure 11. Measurement of Soil Resistivity
13


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