5. A first rewarding example
In the device you will find a Schlumberger table (ExampleSCH) that we will use for this
example.
A few premises before starting:
operations performed in sequence by the instrument:
1. transmits current between the two current electrodes (AB or C1C2) connected to the
ground;
2. measures the potential difference between the potential electrodes (MN or P1P2)
once the measurements have reached the set Sigma;
3. calculates the apparent resistance as K x V / I (where K is the geometric factor);
4. memorizes the data of the measurement.
The operator moves the electrodes up to the new measuring point and starts a new
sequence, the instrument performs the operations again a b c d
The operator intervenes again and proceeds to the end of the measurements indicated in
the table.
Once the measurements are complete, they transfer to the inversion software to obtain a
stratigraphy that will then be correlated to the geology of the ground.
In the paragraph Hardware connections in Figure 13, the appliance-cable-ground
connections to be performed are indicated.
Practical information for use:
• The GEA RM1 resistance meter is placed at the center of the laying;
• To reduce contact resistance, the electrodes must be inserted as deeply as possible into
the ground; if necessary, the piling point must be wet with salt water and if this is not
sufficient, several electrodes must be connected in parallel to increase the contact
surface.
The connection cables between the electrodes must be kept distant from one another to
avoid problems of insulation and mutual coupling.
Before starting the measurements it is necessary (if you have not already) to prepare the
tables. The example is shown in the following images
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