A pretreatment apparatus for performing pretreatment before a painting process includes a treatment tank to be filled with a treatment liquid for degreasing and chemical conversion. The analog to digital converter operates between a minimum voltage and a maximum voltage and uses one or more comparators to generate one or more digital bits, each of the digital bits representative of a conversion voltage. The remote foot controller can then respond to activation by a user to provide a predetermined signal that drives the handheld unit with the appropriate signal. The entrance grid is operably coupled to, and electrically isolated from, the selection grid, which is, in turn, operably coupled to, and electrically isolated from, the ion collector. Active electronic damping reduces oscillation when an inconsistency in thickness of the article is encountered during weighing. The content may then be streamed or downloaded, or a recording of the content may be scheduled.