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National Instruments 778739-01 PXI Matrix Switch Module

Commonly known as the PXI-2529, the National Instruments 778739-01 is a high-density PXI matrix switch module made to withstand the demanding requirements of automated test systems. Depending on the terminal block accessories used, this flexible module can be set up as an 8x16 or 4x32 2-wire matrix. Its electromechanical relays provide little thermal offset for precise low-voltage measurements and perform exceptionally well for high-power signal switching.

Because it is designed to withstand a maximum switching voltage of 150V between channels and between channels and between channels and the ground, the 778739-01 PXI Matrix Switch Module can be used in a range of testing situations. It is significant to remember that when inductive loads, like motors and solenoids, are switched, high voltage transients that are higher than the rated voltage of the module may be produced. If this happens, relay life and module functioning may be impacted and further protection may be required.

Maximum switching power (30 W, or 37.5 VA), maximum switching current (1 A), and maximum carry current (2 A) are all available for each channel. The 778739-01 is the best option for applications that need dependable high-power signal routing because of these specs.

Another notable feature of the 778739-01 module is its RF performance. With typical crosstalk values of less than -80 dB at 10 kHz, -65 dB at 100 kHz, and -50 dB at 1 MHz, it provides a single crosspoint bandwidth of larger than 10 MHz in a 50 Ω system. This guarantees the least amount of cross-channel interference, which is essential for accurate measurements and signal integrity.

For triggering, the module features input and output triggers sourced from PXI trigger lines <0...7>, with a minimum pulse width of 150 ns. The front panel voltage is +3.3 V TTL, 8 mA nominal, and the output trigger pulse width is software-selectable, ranging from 1 µs to 62 µs.