The National Instruments 778572-98 PXI Transfer Switch Module, also known as the PXI-2598, is a dual-transfer switch module specifically designed for routing RF and microwave signals in automated test systems. With its dual-transfer switch configuration, this module excels in basic signal routing and efficiently inserts or removes components within a signal path. It is particularly effective for facilitating high-order harmonic signals from PXI RF Signal Upconverter modules and routing multiple sources to PXI RF Signal Downconverter modules. The module adheres to Measurement Category I standards and is rated for signal voltages up to 100 V, with a maximum cold-switching voltage of 65 Vrms. It is capable of carrying up to 1.25 Arms per channel and can handle RF carry power up to 75 W for a 50 Ω load.

The 778572-98 module delivers exceptional RF performance, with a characteristic impedance of 50 Ω. It boasts an insertion loss of less than 0.2 dB at frequencies up to 3 GHz and less than 0.7 dB at frequencies up to 26.5 GHz. Additionally, it maintains a low voltage standing wave ratio (VSWR) and provides outstanding open channel isolation exceeding 80 dB at up to 3 GHz, with over 50 dB of isolation maintained at frequencies up to 26.5 GHz. The module also features input and output trigger capabilities with software-selectable pulse widths, requiring supply voltages of 3.3 V at 2.5 W, 5 V at 1 W, and 12 V at 4 W from the PXI chassis.

The relay incorporated in the NI 778572-98 is a Radiall electromechanical, latching type, utilizing beryllium copper and gold-plated contacts. This relay operates and releases within 15 ms, with a mechanical lifecycle expectancy of 2.5 million cycles and a recommended cycling speed of 5 channels per second. The module is equipped with eight SMA jacks for I/O connections, and the torque specification for connections ranges from 0.8 to 1.1 Nm. Its dimensions are 21.6 cm x 4.1 cm x 13.0 cm, and it weighs 302 grams, making it lightweight and suitable for indoor use. The recommended ambient temperature range for operation is between 0 °C and 55 °C. The 778572-98 meets various safety compliance standards, including IEC 61010-1, EN 61010-1, UL 61010-1, and CSA C22.2 No. 61010-1, ensuring its reliability and safety in industrial applications.