72 Tips and Tricks
Make sure each participant knows about the possible danger of high voltage.
9.3 Measurements under tough soil conditions
Some environmental conditions make it really hard to conduct a resistivity measurement. There can be
really tough situations like
• very dry soil or sand and
• very hard rock.
But there are also some ways to measure the ground resistivity in that kind of environments.
Sometimes it is not possible to push the electrodes into the ground with bare hands. Then you should
use a hammer. But on really hard rock even that is not possible and you need more helpful tools like a
drilling machine. First drill a hole into the hard underground before placing the electrode. After that the
hole needs to be refilled with wet sand or other good conductive soil to create a good electrical contact
to the surrounding environment as shown in figure 9.5.
If you are working on really dry soil like sand you should use some water (better salt water) and just give
a little splash (small cup) over each electrode shaft to improve the electrical ground contact. You have to
assure that you water all electrodes with the same amount of water. This procedure has to be repeated
each time after replacing the electrodes.
OKM GmbH
www.okmmetaldetectors.com
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