Electrostatic tolerance

Refers to the resistance to static electricity that allows power supply circuits and similar devices to continue normal operation without failure.
There are three causes of static electricity: discharge occurring when a charged human body or clothing comes into contact with equipment, discharge received from other charged electrical or electronic devices, and charging caused by the equipment itself. To evaluate electrostatic withstand capability, electrostatic breakdown tests are conducted, with specific test methods corresponding to each of the three causes mentioned above. When static electricity is applied externally, such as from a human body or other electronic or electrical equipment, the electrostatic withstand capability is expressed in the following two ways, indicated by the peak value of a repeatedly applied pulse representing the tolerable level of static electricity.
(1) Operational electrostatic withstand capability
The maximum value at which normal operation can be maintained when static electricity is applied to any part of the enclosure while the input of the power supply circuit is under rated conditions.
(2) Storage electrostatic withstand capability
The maximum value at which no failure or destruction occurs when static electricity is applied to any part of the outer surface of the enclosure, including input and output terminals, while the input of the power supply circuit is off (not operating).