The National Instruments PXI-2503 is a versatile PXI Multiplexer Switch Module designed for precision applications requiring 1-, 2-, or 4-wire multiplexing configurations. This module offers channel options of 6, 12, 24, or 48, and features a hybrid connector that simplifies integration into various setups. Utilizing electromechanical relays, the PXI-2503 ensures accurate measurements and supports a deterministic scanning process with a 1,024-step scan list. In a conventional setup, it operates as a 14 x 1, 2-wire multiplexer, but it can be software-configured for different configurations, including a 48 x 1, 1-wire multiplexer for multiple measurements at a common reference or a 12 x 1, 4-wire multiplexer for resistive measurements such as RTDs or thermistors. The switch has a bandwidth of 10 MHz and can be further expanded using a terminal block like the National Instruments TB-2606, allowing users to create a 6 x 4, 2-wire matrix. For larger applications, multiple PXI-2503 modules can be linked to form complex systems, such as a 48 x 1, 2-wire multiplexer utilizing two cards. The device features a 68-pin male SCSI I/O connector on the front panel for connecting a 4-wire analog bus, enabling the construction of extensive systems with redundant switch cards. It includes advanced scanning and external trigger inputs for seamless integration with other instrumentation. The PXI-2503 weighs 8 ounces and has dimensions of 8.5 x 0.8 x 5.1 inches. Power requirements are 370 mA typical and 700 mA maximum at +5 VDC. Relay operate times are typical at 3 ms and maximum 5 ms at 20 °C, with a mechanical life expectancy of 5 x 10^7 cycles and electrical life expectancy of 2 x 10^5 cycles. The recommended operating temperature range is 0 °C to 50 °C, with a storage temperature range of -20 °C to 70 °C. A three-year warranty is provided, and user manuals are available for download. For pricing information, please contact a sales representative.