Multi-function interface unit for applied potential tomography

In applied potential tomography, the negative effects of measurement precision due to multiplexer feedthrough and crosstalk and of connection stray capacitances have been highlighted. Envisaging a fully parallel configuration, a circuit is suggested that, when coupled with each electrode, can function as a current source with feedback, as a short circuit to ground or as a voltage buffer, following the positions of a set of local switches. A local regulation system helps to reduce crosstalk and improves the precision when the unit functions as a current source. A local buffer and switching system and a stray capacitance compensation circuit help to reduce stray capacitances and their effects on measurement accuracy.<>