The CN Type M coupling network enables the application of RF test voltage to the power supply lines of 2 and 3 lines of the EUT in common mode, ensuring that the device can withstand conducted disturbances in the 0 Hz to 150 kHz frequency range. In accordance with IEC/EN 61000-4-16, CN Type M provides a reliable method for testing the robustness of power supplies exposed to electromagnetic interference. An additional decoupling transformer is required to protect auxiliary equipment from the test voltage. This configuration ensures that the power supply of the EUT is thoroughly tested, while auxiliary components remain unaffected.