An electronic device for analyzing an aqueous solution may comprise a housing, one or more measurement circuits and a control circuit all arranged inside the housing. The system generates a pressure request to determine if the wheel has lifted. A second etching treatment is carried out to the substrate to form a trench region at the base trench so that the trench region has a rounded-off upper edge. The platen includes a number of radially located elongate working surfaces each providing a servicing function to the printhead that requires a different platen-to-printhead spacing. The first equalization target is a non-DC free equalization target and the second equalization target is a DC-free equalization target. The invention includes determining that a selected slot on the peripheral interface is associated with an adapter of a multiple-slot device, identifying a further slot associated with the multiple-slot device based on the selected slot, and providing power to, or removing power from, the selected slot and the identified further slot.