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National Instruments 778572-69 PXI Relay Module

The 778572-69, also known as the PXI-2569, is a general-purpose, high-density relay module manufactured by National Instruments. With its 100 independent single-pole single-throw (SPST) Form A armature relays, this PXI relay module is a great option for automated test loads with medium power requirements. Every electromechanical latching relay has palladium-ruthenium contacts coated in gold, which guarantees strong and dependable connections.

The maximum switching power per channel for the 778572-69 is 60 W, or 62.5 VA, for frequencies up to 60 Hz. It can withstand a maximum switching voltage of 100 V, both channel-to-channel and channel-to-ground. It allows for both switching and carrying at a maximum current of 1 A per channel. A minimum end-of-life resistance of 1.0 ohm and a guaranteed initial DC path resistance of less than 0.55 ohms define the characteristics of the module. For precise measurements, it is advantageous that the typical thermal electromotive force (EMF) is maintained below 12 μV.

Impressive bandwidth capabilities are another highlight of the 778572-69, with a -3 dB bandwidth of at least 20 MHz under ordinary conditions. With values of -85 dB at 10 kHz, -65 dB at 100 kHz, -45 dB at 1 MHz, and -25 dB at 10 MHz, it shows little crosstalk, guaranteeing clear signal integrity even in high-frequency applications.

For triggering, the 778572-69 can utilize PXI trigger lines <0...7> with a minimum pulse width of 150 ns for input triggers. In order to provide flexibility in test sequencing and synchronization, output triggers with software-selectable pulse widths ranging from 1 µs to 62 µs can also be delivered to PXI trigger lines <0...7>.

The module physically connects to an I/O receptacle via a 200 POS LFH Matrix 50 handle. Only inside use is appropriate, and at 25 °C ambient temperature, it can operate at a maximum height of 2,000 meters. It runs in a non-condensing range of relative humidity (10%) to 90% and ambient temperature range of 0 °C to 55 °C. It can be stored in environments with non-condensing relative humidity levels of 5% to 95% and temperatures between -20°C and 70°C.

Having a 32,000-step scan list for deterministic scanning capabilities, the 778572-69 is entirely software programmable. Due to the fact that medium-power test loads depend on relay density being maximized, it is an excellent fit for applications needing automated test equipment.