The National Instruments PXI-2594 is a high-performance RF multiplexer switch module designed for demanding applications requiring signal routing from DC up to 2.5 GHz. This 4x1 multiplexing switch operates with a characteristic impedance of 50 Ohms and supports a maximum voltage rating of 30 Vrms alongside a maximum switching current of 500 mA. It is particularly well-suited for automated test equipment (ATE) frameworks due to its low insertion loss, making it ideal for high-recurrence signal applications. The PXI-2594 features excellent voltage standing-wave ratio (VSWR) and isolation characteristics, ensuring reliable performance in various testing environments. Additionally, it is equipped with relay count tracking to minimize unexpected downtime. While higher frequency signals can be transmitted through this module, it is essential to review the insertion loss, VSWR, and isolation specifications relative to the application's bandwidth to determine the most suitable switch module. The path resistance is influenced by both relay contact resistance and trace resistance, with contact resistance remaining low throughout the relay's lifespan until nearing its end. Notably, the PXI-2594 can detect trigger pulse widths as short as 150 ns by disabling digital filtering, enhancing its versatility in high-speed applications. For further details, a user manual and maintenance documents are available for download.