Electrostatically Induced Voltage in Metal Box When Charged Object Like Hand Moves Away From the Box to Three Directions

When a charged human body stands up from a chair or walks in a room using an air conditioner, a malfunction or failure of electronic devices is caused occasionally by the static electricity. When the charged human body operates the electronic device by a charged hand, an instantaneous electrostatically high induced voltage is generated in the metal case of the electronic device. Such the induced voltage is generated in a metal case when a charged object of charged hand moves near the metal case. An experiment is conducted where an induced voltage is measured using a real experimental setup when a charged object moves away from the metal case to the left, right, or back. The voltage induced in the metal case is measured using a spark gap and an electromagnetic wave sensor. The results show that the voltages induced in the metal case are -0.6 times the voltage of a charged object when the charged object moves away from the metal case. The induced voltage of 6 kV is generated in the metal case for the charged hand of -10 kV. The results will be beneficial in solving the malfunction or failure of electronic devices caused by induced voltages.