MI 3290 Earth Analyser
Tests and Measurements
93
Test can be started from the Schlumberger method measurement window. Before carrying
out a test the following parameters (Test Voltage, Distance (a), Distance (d) and Limit
(ρ))
can be edited.
Figure 11.47: Schlumberger method measurement menu
Test parameters for Schlumberger method:
Test Voltage
Set test voltage: [20 V or 40 V]
Length Unit
Set the length unit: [m or ft]
Distance (a)
Set the distance between earth electrodes: [0.1
– 49.9 m] or [ 1 – 200 ft ]
Distance (d)
Set the distance between earth electrodes: [0.1
– 49.9 m] or [ 1 – 200 ft ]
Limit (ρ)
Limit value selection: [
OFF, 0.1 Ωm – 900 kΩm]
Limit value selection:
[OFF, 1 Ωft – 900 kΩft]
Schlumberger method Measurement procedure:
Select the Schlumberger method measurement function.
Set the test parameters (voltage, distances and limit).
Connect the test leads to the instrument and to the test object.
Press the Run key to start the measurement.
Wait until the test result is displayed on the screen.
Save results (optional).
Figure 11.48: Example of Schlumberger method
measurement result
Notes:
Consider displayed warnings when starting the measurement!
High noise currents and voltages in earth could influence the measurement results. The
tester displays the
“noise” warning in this case.
Notes (Probes):
High impedance of S and H probes could influence the measurement results. In this
case,
“Rp” and “Rc” warnings are displayed. There is no pass / fail indication in this
case.
Probes must be placed at a sufficient distance from the measured object.
