The ground cable is necessary to perform DMT and SDMT measurements. It connects to the Control Unit and – at the opposite end of the cable – the alligator clamp should grip the rods pushed into the ground. The ground cable must provide a very good electrical contact with the rods advancing the DMT and/or the SDMT in the soil. The ground cable may be connected to the penetration machine instead of to the rods, if there is good electrical contact between machine and rods.

Important Note: If the electric contact is not sufficiently clear to the penetration rods (resistance higher than 200 Ohms), the DMT and especially the SDMT may not work properly. Avoid to clamp the ground cable to parts with paint, mud or rust.