Measurement and calculation of electrostatically induced voltage generated on an ungrounded metal box

•We model the experimental situation that a charged body like a human body moves near an ungrounded metal case of electronic equipment.•A comparison between the measured induced voltage and the calculated induced voltage of the metal case, by means of two methods, has been performed.•The results will be helpful to estimate the possibility of malfunction and failure by induced voltage and whether a standard test method should be considered.

When a charged body passes by the front of an ungrounded metal box such as a box of electronic equipment, an electrostatically induced voltage is generated. The induced voltage can cause malfunctions and failure of the equipment. However, whether a voltage is induced in the metal box by a moving charged body and how much is induced is not clear. In this study, measured induced voltages are compared with values calculated for two capacitance-measuring methods. The results will be helpful to estimate the possibility of malfunction and failure by induced voltage and whether a standard test method should be considered.