Electromagnetic emission simulators (EES) are hardware or software simulators for simulating electromagnetic environmental conditions that can lead to interference. They are used for disturbance simulation and immunity tests. Simulators are test systems for real-time simulation of electromagnetic signals
Immunity tests are used to determine the resistance of electronic devices and systems to the electromagnetic disturbances expected from their environment. According to the variety of interference sources, numerous simulation methods exist, such as conducted interference, switching voltage interference(burst), overvoltages and harmonics.