Defines the immunity test requirements for information technology equipment (ITE, as defined in CISPR 22) in relation to continuous and transient, conducted and radiated disturbances, including electrostatic discharges (ESD). Procedures are defined for the measurement of ITE and limits are specified which are developed for ITE and within the frequency range from 0 Hz to 400GHz.This publication establishes requirements which will provide an adequate level of intrinsic immunity so that the equipment will operate as intended in its environment. The test requirements are specified for each port considered.