The National Instruments part number 777697-01, also known as the PXI-2503 Multiplexer Switch Module, is designed for advanced switching applications featuring a bandwidth of 10 MHz and supporting up to 24 channels. This module operates with a maximum switching current of 1A per channel and a maximum voltage capacity of 30 VAC or 60 VDC, making it suitable for a variety of measurement tasks. It is compatible with the Windows-based NI-SWITCH software, facilitating easy configuration and operation. Users can set this versatile switch module in a 24 x 1, 1-wire multiplexer arrangement for common reference measurements, or as a 12 x 1, 4-wire multiplexer tailored for resistive measurements such as RTDs or thermistors. The module can also be configured as a 6 x 4, 2-wire matrix with the addition of a National Instruments TB-2606 terminal block, while supporting a 4-wire analog bus through its 68-pin male SCSI I/O connector, ideal for creating large systems with redundant switch capabilities. The device includes advanced scanning features, allowing for deterministic scanning with a maximum scan rate of 100 channels per second. Built with electromechanical relays, it ensures precision and reliability, boasting a mechanical life of 50 million cycles and an electrical life of 200,000 cycles. The typical relay operation time is 3 ms, extending to a maximum of 5 ms at 20 °C. Compact in design, the module measures 8.5 x 0.8 x 5.1 inches and weighs 8 oz, with power requirements of 370 mA typically and 700 mA maximum at +5 VDC. The National Instruments PXI-2503 (777697-01) is an essential component for efficient and reliable measurement systems.