Source Equivalent Modeling Method in Conducted Susceptibility Testing

During conducted susceptibility testing using the bulk current injection (BCI) method, the position of the injection probe significantly impacts the magnitude of the induced current at the port of the device under test (DUT). To precisely quantify probe effects, establishing its equivalent model is essential. Existing models typically characterize the probe and cable independently and overlook the connection of the line impedance stabilization network (LISN) in practical test setups. Building upon current probe modeling methodologies, this paper proposes a simplified calibration fixture design and innovatively constructs a unified equivalent source model integrating the injection probe, coupling cable, and LISN. This approach overcomes the limitations of separate characterization, better aligns with real-world testing scenarios, and establishes a modeling foundation for accurately determining the induced current at the DUT port.