TENTECH MTD 20KWe Manual De Uso página 11

Select the position ρ (4 pole) in the FUNCTION Selector Switch 
2.
and connect the rods, as it is shown in figure 02.
3. Find the most
Pushbutton.
4. To obtain the soil resistivity value, Wenner's equation should be
applied. In its simplified form, this equation is as follows:
Where:
ρ = soil resistivity value, expressed in [Ωm]
•
π = 3.14159
•
R = value shown on the display.
•
D = distance between the rods, expressed in meters.
•
appropriate range
ρ = 2πRD
12
and press the START