National Instruments 778739-01

The National Instruments part number 778739-01, also referred to as the PXI-2529, is a high-density PXI matrix switch module optimized for the stringent demands of automated test environments. It offers versatile configuration options, supporting an 8x16 or 4x32 2-wire matrix depending on terminal block accessories. Equipped with electromechanical relays, the module ensures minimal thermal offset, allowing for reliable low-voltage measurements while maintaining exceptional performance in high-power signal switching applications. Designed to handle a maximum switching voltage of 150V between channels and to ground, the 778739-01 is suitable for a variety of testing scenarios; however, caution is advised when switching inductive loads, as high-voltage transients may exceed the module’s rated limits, potentially impacting relay life and overall functionality.

This module provides a maximum switching power of 30W (or 37.5 VA) and can manage a maximum switching current of 1A and a maximum carry current of 2A per channel, making it ideal for reliable high-power signal routing. Furthermore, the PXI-2529 demonstrates impressive RF performance, with crosstalk values recorded at less than -80 dB at 10 kHz, -65 dB at 100 kHz, and -50 dB at 1 MHz, alongside a single crosspoint bandwidth exceeding 10 MHz in a 50 Ω system. Such specifications guarantee minimal cross-channel interference, which is critical for maintaining signal integrity and achieving precise measurements.

For triggering functions, the module is equipped with input and output triggers sourced from PXI trigger lines 0 through 7, featuring a minimum pulse width of 150 ns. The front panel voltage is +3.3 V TTL at a nominal current of 8 mA, with the output trigger pulse width being software-selectable, ranging from 1 µs to 62 µs, enhancing the module's versatility in various testing applications.