The National Instruments PXI-2591 (Part Number: 778339-01) is a high-frequency PXI RF Multiplexer Switch Module featuring an unterminated 4 x 1 configuration. This module is capable of switching signals across a frequency range from DC to 4 GHz, with a characteristic impedance of 50 ohms for each channel. It is engineered to manage a maximum voltage of 30 Vrms and a maximum current of 330 mA, making it suitable for a wide array of applications, particularly in automated test equipment (ATE) systems where high-frequency signal channeling is essential. The PXI-2591 demonstrates minimal insertion loss, recording less than 0.6 dB at frequencies up to 2.5 GHz and less than 0.9 dB at 4 GHz. Users can expect a maximum switching voltage of 30 V for both channel-to-ground and channel-to-channel configurations, alongside a maximum carry current of 0.33 A and switching power capability of 10 Watts. Trigger signals for this module are received via STAR and PXI trigger lines 0-7 with a minimum pulse width of 70 ns. The PXI-2591 utilizes non-latching electromechanical relays made with gold contact material, featuring a rapid operate/release time of 15 ms, and is rated for 5,000,000 mechanical and 100,000 electrical cycles. It includes five SMA female I/O connectors for signal interfacing. The module has a compact footprint with dimensions of 3.9 x 6.3 x 1.6 inches and weighs approximately 225 grams (8 ounces). For additional information, a user manual and maintenance manual are available for download, and inquiries regarding pricing should be directed to a sales representative.