National Instruments 778572-84 PXI Multiplexer Switch Module

The National Instruments 778572-84, often referred to as the PXI 2584, is a 12-channel, 600 V, 1-wire PXI multiplexer switch module, designed specifically for high-voltage applications such as fuel cell and battery stack testing. With its reed relays' longer lifespans and quicker actuation times, this module is a dependable test equipment component. The 778572-84 greatly increases test performance thanks to its hardware trigger-supported deterministic operation and integrated relay counting for monitoring.

In DC systems, the module can handle up to 10 W of switching power per channel and 0.5 A of maximum current rating per channel or common. Throughout its operational career, the DC path resistance remains constant, starting at ≤1.1 Ω and increasing to >2 Ω as it nears its end of life. The 778572-84 exhibits dynamic properties such as a maximum scan rate of 600 channels per second and a typical relay operating time of 0.81 ms, ranging from 0.4 ms to 0.81 ms.

In terms of physical construction, the 778572-84 is made of rhodium contact material reed relays and is included in a small 3U, one-slot PXI/cPCI module measuring 21.6 cm × 2.0 cm × 13.0 cm (8.5 in. × 0.8 in. × 5.1 in.) and weighs just 212 g (7.5 oz). The module connects using a MINI-COMBICON connector that has 16 locations and a pitch of 3.81 mm. PXI power requirements are 0.2 W at 3.3 V and 1.6 W at 5 V.

Based on IEC 60068-2-1 and IEC 60068-2-2 standards, the 778572-84 is intended for indoor use and functions effectively within an ambient temperature range of 0 °C to 55 °C and a relative humidity range of 10% to 90%, noncondensing.  It can be stored at temperatures up to 55 °C and in noncondensing relative humidity levels between 5 and 95 percent. The operational shock rating of the module, which satisfies IEC 60068-2-27 and MIL-PRF-28800F requirements with a peak of 30 g and an 11 ms pulse, as well as its vibration tolerance, which spans from 5 Hz to 500 Hz at 0.31 grms during operation and 2.46 grms during non-operation, further demonstrate its robustness.