The Siglent SEM5024A is a 4-port Electronic Calibration (ECal) Module designed for efficient and precise calibration of vector network analyzers over a frequency range of 100 kHz to 13.5 GHz. This ECal module uses 3.5 mm female RF connectors and connects via USB 2.0 for both power and control. It is compatible with Siglent SNA5000A, SNA6000A, SVA1000X, and SHA800A series VNAs. Once connected, the SEM5024A is automatically recognized by the instrument, allowing quick and consistent calibration without repeated cable reconnections. This reduces human error, minimizes wear on connectors, and shortens calibration time. LED indicators clearly display operational readiness. With compact dimensions and solid construction, it’s suitable for both lab and production environments.