Amprobe Multitest-1000 Continuity-Tester - Manual (Page 31)

4.4. EARTH ρ: EARTH RESISTANCE AND RESISTIVITY MEASUREMENT
Turn the rotary knob to the EARTH ρ position.
Switch on the instrument.
The FUNC key permits to select one of the following measuring modes
(which can be shown cyclically when pressing the key):
FUNC
)
Mode “2P” (the instrument measures earth resistance between 2 points).
) Mode “3P” (the instrument measures earth resistance using two auxiliary
earth rods).
) Mode “ ρ“ (the instrument measures earth resistivity).
The resistance is measured with a 4-cable voltamperometric method, so the value
measured is not dependant on the utilized cables. For this reason this method doesn’t
need any cable calibration.
If the cables aren’t long enough, lengthen them or utilize cables longer than the standard
ones.