Measurements of potential distributions near flat boards

The authors have developed two types of 2-dimensional measurement systems that measure the potential distribution near electrified flat boards. One system is based on one accurate potential sensor with a mechanical scanning structure; the other system is based on an array of low cost FET probes. These systems show charge distribution on the board. The characteristics of these systems are certified using simply formed printed circuit boards (PCB). Examples of the entirely or partially charged PCB are also shown.