OKM FS Future GeoSeeker Mini, User Manual

Page: 44 / 52

44 Analyzing a Measurement
While scanning an area you will see the measured values (power, voltage and resistivity) of the current
scan point on the display of the control unit. Based on that values you can make first conclusions about
your scan field conditions.
You always have to take the following aspects into your considerations:
• You always have to inform yourself about the geological structures in your area to know about
the underground conditions.
• Soil composition, ground moisture and temperature are influencing the soil resistivity. Soil is
rarely homogeneous and the resistivity of the soil will vary geographically and at different soil
depths.
• Very low resistivity values are indicating a good conductance, which could indicate a high
probability of water deposits.
• Very high resistivity values are indicating a bad conductance, which could indicate a high
probability of cavities.
7.1 Interpretation of scan values
There are 3 basic values indicated after each single scan process. So you will get a rough idea about the
underground conditions while scanning the area. The measure values are shown in figure 7.1.
The available measure values are:
• Voltage (mV): The voltage is measured in Millivolt (mV) and indicates the potential difference
measured by the voltage electrodes.
• Power (mA): The power is measured in Milliampere (mA) and indicates how much electrical
current has been injected into the underground through the power electrodes.
• Resistivity (Ωm): The ground resistivity is measured in Ohm-Meter (Ωm) and indicates the
resistance of the underground at the current scan point and depth. It is mainly calculated by the
power, voltage and distance of the electrodes.
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Figure 7.1: Measure values as indicated during a measurement
Measure Values