The adequate testing of a TEM system has to involve measurements in field with large transmitter and receiver loops and an artificial conductor with controlled transient response. As such a conductor it is convenient to use a large horizontal wire loop terminated to a resistor. The merits of a large loop conductor are the ease of placing out on the ground and the possibility of calculating its transient response. To assess the limitations of a loop conductor as a source of testing TEM signals, the effect of eddy currents in the ground on the transient response of a loop conductor was investigated. This investigation implies that the more resistive is the ground, and/or the smaller are the transmitter and receiver loops, the less the measured transient response differs from the intrinsic response of a loop conductor. Both field measurements and numerical experiments support the validity of using a large loop conductor for testing a full-sized TEM system.


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