PXI-2549

The PXI-2549 is a PXI RF Relay Module from National Instruments, designed for RF signal routing, automated RF testing, switch network expansion, high-channel-count multiplexer construction, and modular PXI test systems. As a 2.7 GHz, 50 Ω, dual-terminated SPDT PXI RF relay module, the NI PXI-2549 provides a general-purpose single-pole double-throw switching solution with internal termination resistors. NI lists the PXI-2549 with part number 778572-49.

The NI PXI-2549 is useful for engineers who need controlled RF path switching in automated test systems. It can be used to route RF signals between signal generators, spectrum analyzers, vector signal analyzers, RF upconverters, RF downconverters, filters, amplifiers, antennas, and devices under test. Compared with manual RF switching, the PXI-2549 allows RF paths to be controlled through software, making it suitable for repeatable test sequences, laboratory automation, and production RF testing.

One of the main advantages of the PXI-2549 RF Relay Module is its dual-terminated SPDT topology. The termination resistors help minimize reflections on open channels and help protect the signal source or device under test from possible damage. This is especially useful in RF systems where unterminated paths can cause reflected power, signal distortion, or measurement instability.

The National Instruments PXI-2549 supports 50 Ω RF signal routing up to 2.7 GHz. This frequency range makes it suitable for RF and wireless test applications such as RF front-end testing, communication device validation, amplifier testing, filter validation, receiver testing, RF source routing, and automated signal path selection. NI also describes the module as having strong insertion loss, VSWR, and isolation performance to help reduce signal degradation during RF switching.

The PXI-2549 can be used to add flexibility to RF switch networks or to maintain uniform signal paths when building high-channel-count multiplexers. This makes it practical for test systems that require consistent RF path behavior across multiple channels. The SPDT architecture is useful for source selection, measurement path switching, signal routing, and compact RF switch network design.

Another useful feature of the NI PXI-2549 is onboard relay count tracking. This feature helps users monitor relay usage and estimate relay lifetime, reducing the risk of unexpected downtime in automated test systems. Relay count tracking is especially valuable in production environments where RF switch modules may operate repeatedly over long periods.

In system integration, the PXI-2549 PXI RF Relay Module installs into a compatible PXI or PXI hybrid chassis and can be used with RF signal generators, spectrum analyzers, vector signal transceivers, digitizers, source measure units, data acquisition modules, and other PXI instruments. This allows engineers to build compact automated RF test systems with software-controlled RF signal routing.

The PXI-2549 is suitable for applications such as RF signal routing, RF switch network expansion, wireless device testing, RF source selection, RF path switching, receiver testing, production RF test, and automated measurement systems. Its dual-terminated SPDT design is especially useful when reflection control and source protection are important.

Overall, the NI PXI-2549 PXI RF Relay Module is a flexible RF switching solution for PXI-based automated test systems. With its 2.7 GHz bandwidth, 50 Ω impedance, dual-terminated SPDT topology, relay count tracking, and software-controlled switching capability, the PXI-2549 is well suited for RF signal routing, wireless validation, switch network expansion, production testing, and modular PXI test applications.