OKM FS Future GeoSeeker Mini, User Manual

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32 Conducting a measurement
The GeoSeeker Mini is a geoelectrical measuring instrument and thus intended to measure the
resistivity of underground layers. The conductivity of different layers can be used to find potential places
of water deposits or cavities. The quality of your measured data depends strongly on the accuracy of
your conducted measurement.
Before you are going to conduct a new measurement you have to make sure that all your equipment is
intact and ready to use. Check all cables and connectors for possible damages and recharge all
batteries. Also ensure that no parts are missing before going to your scan field. Keep your equipment
always clean and dry.
6.1 Basic Information
Before you are going to set up a new measurement you have to investigate about your specific scan
area. There are some important aspects you have to be aware of before starting your measurement.
• If you are scanning for cavities the overlying layers must not be too wet otherwise the injected
power will not reach its final depth. The injected power always uses the easiest and most
conductive way to flow through the underground soil.
• Never conduct a measurement during or directly after a thunderstorm. Lightning strikes are not
only influencing your measurement, they are also very dangerous while laying out the cables and
putting the electrodes into the ground.
• When conducting a measurement the surface of your scan field should be equally dry and not
wet. So it will be a bad idea to run a measurement during or directly after rainy days. Wait some
days until the ground is not too wet anymore before conducting a measurement.
• The electrodes have to be in good electrical contact with the surrounding soil. The deeper the
electrodes are placed into the ground the better the contact and the better the final measuring
result.
• The deeper you are scanning the larger the underground objects must be. You cannot detect
very small cavities or water deposits at very high depths. It is also much more easy to detect
thick objects that overlap more depth layers than flat objects as shown in figure 6.1.
OKM GmbH
www.okmmetaldetectors.com
Figure 6.1: Detection of thick objects is better than flat objects
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