NI PXIe-2524 PXI Express RF multiplexer module

The National Instruments PXIe-2524 is a high-performance PXI Express RF multiplexer module designed to enable flexible signal routing in high-frequency test and measurement systems. As part of NI’s PXIe switch family, it combines 32 channels of single-pole, double-throw (SPDT) relays with a broad frequency range of DC to 6 GHz, making it ideal for applications requiring precise control over RF signals in aerospace, defense, and wireless communication testing.

The PXIe-2524 integrates seamlessly into PXIe chassis, leveraging the high-speed backplane for rapid command execution and synchronization with other instruments like signal generators and analyzers. Its SMA connectors ensure reliable signal integrity, while latching relays reduce power consumption during steady-state operation. Whether configured as a 32×1 multiplexer, multiple independent banks, or a matrix, the PXIe-2524 delivers the versatility needed to streamline complex RF test setups, reducing system size and improving test throughput.

Detailed parameter table

Core advantages and technical highlights

Broad frequency coverage

The NI PXIe-2524 supports signals from DC to 6 GHz, addressing the needs of modern RF systems operating in bands up to 5G and beyond. This wide range eliminates the need for multiple modules in mixed-frequency test environments, simplifying system architecture while maintaining performance across diverse applications—from baseband signal routing to millimeter-wave precursor testing.

Low signal degradation

With insertion loss as low as 1.2 dB at 1 GHz and VSWR below 2.0:1 at 6 GHz, the PXIe-2524 minimizes signal distortion, ensuring accurate measurements even at high frequencies. This is critical in radar and satellite testing, where signal integrity directly impacts the validity of test results, such as range accuracy or modulation quality.

High-density integration

Packing 32 channels into a single PXIe slot, the PXIe-2524 maximizes channel count without expanding chassis footprint. This density is invaluable in production test environments, where space constraints and high throughput demand compact, multi-channel solutions. Latching relays further enhance efficiency by consuming power only during switching, reducing heat buildup in densely packed systems.

Precise synchronization

The PXIe-2524 leverages the PXIe backplane and dedicated trigger lines to synchronize switching with other instruments, achieving sub-microsecond timing alignment. This capability is essential in phased-array antenna testing, where coordinated signal routing across multiple modules ensures accurate beamforming measurements.

Typical application scenarios

In 5G device testing, the NI PXIe-2524 routes RF signals between a device under test (DUT) and multiple test instruments, such as vector network analyzers and power meters. Its 6 GHz range covers sub-6 GHz 5G bands, enabling automated testing of transceivers for parameters like output power and modulation quality. By quickly reconfiguring signal paths, the PXIe-2524 reduces test times for high-volume production lines.

In aerospace and defense, the PXIe-2524 supports radar system validation by switching between antenna elements and test equipment. Its low insertion loss ensures minimal impact on sensitive radar signals, while its rugged design withstands the harsh operating conditions of lab and field testing. For satellite communication systems, the module routes signals between transponders and ground-based test gear, verifying performance across frequency bands up to 6 GHz.

Installation, commissioning and maintenance instructions

Installation preparation

Before installing the NI PXIe-2524, ensure the PXIe chassis is powered off and properly grounded. Use an anti-static wristband to handle the module, avoiding contact with connector pins. Verify the chassis has an available x1 Gen 2 slot and sufficient power (≥3.3 V at 1.2 A and +12 V at 0.8 A). Prepare SMA cables rated for 6 GHz, and inspect connectors for damage. Mount the module in the chassis, securing it with front-panel screws, then connect signal and trigger cables—tightening SMA connectors to 8 in-lbs (0.9 Nm) to prevent signal loss.

Maintenance suggestions

Regularly inspect SMA connectors for corrosion or debris; clean with isopropyl alcohol and a lint-free cloth if needed. Monitor relay operation via NI Switch Executive software to detect sticking or slow responses, which may indicate wear. Avoid exceeding the 6 GHz frequency limit to prevent signal degradation. For long-term storage, power the module quarterly to exercise relays and prevent contact oxidation. If relays require replacement, use only NI-certified parts to maintain performance specifications. Keep the module within operating temperature ranges to avoid thermal stress on components.