method and device for determining a measure for the oberflaechenpotential one by means of a corona - aufladeeinrichtung charged medium.

摘要

A medium to be charged is conveyed past a corona charging device, so that charge emitted by the corona charging device is deposited on the medium surface. A measuring wire disposed between the medium and the corona charging device, but positioned near the medium, collects a part of the emitted charge. A first measuring circuit is used to determine a measure id of the charge current collected by the measuring wire. A second measuring circuit determines a measure if of that part of the emitted charge current that flows to the medium. In accordance with a predetermined relation, a value E of the surface potential is derived from these measures if and id.