The Electrostatic Discharge (ESD) immunity test, IEC61000-4-2, simulates the electrostatic discharge of an operator directly onto an adjacent electronic component. An electrostatic charge usually develops in low relative humidity, and on low-conductivity carpets, or vinyl garments. To simulate a discharge event an ESD generator applies ESD pulses to the equipment-under-test (EUT). This can happen via direct contact with the EUT (contact discharge), or via an air-gap (air-discharge). Characteristics for this test are the short rise time and the short pulse duration of less than 100 ns, indicating a low-energy, static pulse. This test requires a minimum of ten single discharges of positive and negative polarity within a recommended time interval between discharges of one second.