Designed to be particularly useful for agricultural surveys measuring soil salinity, the EM38 can cover large areas quickly without ground electrodes. Based on the same patented induction principle as the EM31, the EM38 provides depths of exploration of 1.5 meters and 0.75 meters in the vertical and horizontal dipole modes respectively.
Very lightweight and only one meter long, the EM38 provides rapid surveys with excellent lateral resolution. Measurement is normally made by placing this instrument on the ground and recording the meter reading. Digital meters are located on the top and the side of the EM38 for the horizontal and vertical dipole measurements. Continuous or station measurements can also be taken from a standing position using the optional carrying handle with trigger and cable for connection to the DL720 data logger. In this mode of operation 3000 data points can easily be obtained in one hour.
The EM38 has proven very useful in many geotechnical applications such as in archeology where use can also be made of the inphase component giving a measurement of the soil magnetic susceptibility.