Why Modern Test Systems Are Moving Beyond the Rack
Test systems have changed dramatically over the past decade.
A modern aerospace engine test facility no longer consists of a single rack of instrumentation connected to a nearby device under test. Instead, engineers collect measurements from engine test cells, environmental chambers, structural rigs, hardware-in-the-loop simulators and distributed control systems that may be located throughout an entire facility.
As programmes become larger and more complex, engineers face a different challenge—not simply collecting more data, but collecting it from multiple locations while ensuring every measurement remains synchronised, accurate and easy to manage.
This shift is one of the key reasons why Ethernet-based measurement architectures have become increasingly important.
Rather than concentrating every instrument inside one chassis, engineers can place measurement hardware where it is needed, connect it across a standard network and build systems that expand as requirements grow.
For organisations designing long-life automated test systems, that flexibility is becoming just as important as raw measurement performance.
Why LXI Is Becoming the Architecture of Choice
LXI (LAN eXtensions for Instrumentation) was developed to bring the advantages of standard Ethernet networking to automated test and measurement.
Unlike a traditional chassis-centric approach, LXI enables instruments to communicate over a network, making it easier to distribute measurement hardware across laboratories, production facilities and large test cells.
Instead of bringing the signal over long cables to your measurement PXIe rack, LXI brings the instrument to the sensor, thus shortening the cable between the sensor and your measurement device. The pick-up of noise in long cables between the sensor and the rack, worsens the Signal-to-Noise ration drastically as EMC noise is picked up in these long cables.
For aerospace, defence and research organisations, this offers several practical advantages:
- Distributed measurement without being constrained by a single chassis
- Easier system expansion as projects evolve
- Standard Ethernet connectivity using existing network infrastructure
- Simplified integration with other network-connected equipment
- Support for precise synchronisation across multiple instruments
Instead of asking engineers to redesign an entire test system when additional channels are required, an LXI architecture allows new measurement resources to be added as the system grows.
This scalability makes LXI particularly well suited to large facilities where instrumentation may be spread across multiple locations rather than confined to one rack.
Why a Traditional PXIe Chassis Isn’t Always Enough
PXIe has earned its reputation by providing high-performance modular instrumentation with exceptional bandwidth and low latency.
For many applications, it is the right solution.
However, traditional PXIe systems are fundamentally centred around a local chassis.
As test systems become increasingly distributed, engineers often need to synchronise measurements across multiple locations, integrate network-based instruments and manage data from different parts of a facility.
At that point, the challenge is no longer simply choosing the fastest measurement hardware.
The challenge is building an architecture that connects everything together without compromising timing, scalability or future expansion.
This is not a limitation of PXIe technology itself. Rather, it reflects the fact that today’s automated test environments extend well beyond a single chassis.
Why Bustec Developed the ProDAQ 6400
This is where the ProDAQ 6400 takes a different approach.
Bustec did not set out to build another conventional PXIe mainframe.
Instead, the objective was to combine the proven flexibility of PXIe measurement cards with the scalability and openness of the Bustec LXI ecosystem.
The result is an LXI platform that hosts high-performance PXIe measurement cards.
From the user’s perspective, the ProDAQ 6400 becomes another intelligent resource on the LXI network. It integrates naturally with existing Bustec LXI systems, DAAS software and synchronisation infrastructure, allowing engineers to expand their measurement capability without changing the way they design or operate their test systems.
In other words, PXIe provides the modular measurement technology, while LXI provides the architecture that connects everything together.
That distinction is what makes the ProDAQ 6400 fundamentally different from a conventional PXIe chassis.
Introducing the Bustec LXI Ecosystem
The ProDAQ 6400 is not intended to stand alone.
It forms part of a broader measurement ecosystem designed to support organisations throughout the lifecycle of their automated test systems.
Today, that ecosystem includes:
- LXI for distributed, Ethernet-based measurement
- PXIe measurement cards for modular, high-performance acquisition
- VXI for organisations maintaining long-life legacy systems
- DAAS software for configuration, acquisition, synchronisation and analysis
Rather than forcing customers to replace existing investments, Bustec enables them to extend and modernise their systems while continuing to use proven technologies where they deliver value.
This philosophy of investment protection has long been part of Bustec’s approach and remains central to the ProDAQ 6400.
Distributed by Design
The greatest strength of the ProDAQ 6400 is not simply that it supports PXIe measurement cards—it’s that those cards become part of a distributed LXI architecture.
Traditional automated test systems often evolve over many years. What starts as a single rack of instrumentation can grow into multiple test cells, environmental chambers, control rooms and remote measurement locations. As these systems expand, engineers need an architecture that grows with them without introducing unnecessary complexity.
Because the ProDAQ 6400 is built on the Bustec LXI platform, additional measurement resources can be integrated into the existing Ethernet-based infrastructure rather than being confined to a single chassis.
For engineers, this means:
- Expand systems as requirements increase
- Locate measurement hardware closer to the device under test
- Simplify network integration using standard Ethernet
- Reduce the need for extensive proprietary infrastructure
- Build systems that are easier to maintain and upgrade over time
Instead of designing around the limitations of a chassis, engineers can design around the needs of the application.
That flexibility is increasingly important in aerospace engine testing, structural testing, environmental qualification and large-scale research programmes.
Precision PXIe Measurements
While the platform is LXI, the measurement performance comes from high-performance PXIe instrumentation.
This combination allows organisations to benefit from modern modular measurement technology without sacrificing the advantages of a distributed LXI architecture.
Bustec’s design philosophy has always prioritised one principle above all else:
When Accuracy Matters.
In mission-critical applications, the objective is not simply to collect more samples per second—it is to ensure every measurement is trustworthy.
Whether monitoring temperatures during environmental testing, measuring strain on aircraft structures or capturing analogue signals from propulsion systems, engineers need confidence that the data accurately represents the physical system under test.
The ProDAQ 6400 has been designed to support precision PXIe measurement cards featuring capabilities such as:
- High-resolution analogue measurement
- True channel isolation
- FPGA-based processing
- High channel density
- Deterministic performance
This makes the platform suitable for demanding applications including:
- Aerospace engine testing
- Ground support equipment
- Hardware-in-the-loop (HIL) simulation
- Defence electronics validation
- Research laboratories
- Energy and industrial test systems
Rather than viewing PXIe as the complete solution, Bustec uses it as the measurement engine within a broader LXI-based architecture.
Synchronize Everything
As automated test systems become more distributed, synchronisation becomes just as important as measurement accuracy.
Measurements collected from different instruments only become valuable when they can be accurately correlated in time.
The Bustec architecture has been designed to support synchronised measurements across the wider LXI ecosystem, allowing engineers to build systems where multiple measurement devices operate from a common timing strategy.
This is particularly valuable in applications such as:
- Engine development
- Structural load testing
- Environmental qualification
- Integrated vehicle testing
- Long-duration endurance testing
Instead of analysing isolated datasets, engineers gain a unified view of the complete system under test.
When combined with DAAS software, synchronised measurements from multiple sources can be acquired, visualised and analysed within a consistent environment.
The result is faster troubleshooting, improved correlation between measurements and greater confidence in engineering decisions.
One Measurement Ecosystem
Perhaps the greatest advantage of the ProDAQ 6400 is that it does not force customers to choose between technologies.
Many organisations already have significant investments in automated test infrastructure.
Some operate distributed LXI systems.
Others continue to rely on proven VXI platforms.
Many now require the flexibility offered by modern PXIe instrumentation.
Rather than replacing one technology with another, Bustec brings them together.
The Bustec measurement ecosystem includes:
- LXI for distributed, Ethernet-based instrumentation
- PXIe for high-performance modular measurements
- VXI for long-life legacy support
- DAAS for configuration, acquisition, synchronisation and analysis
This unified approach enables organisations to modernise at their own pace while protecting existing investments.
Instead of creating isolated technology silos, the ProDAQ 6400 becomes another building block within a complete measurement architecture.
Built for Existing Bustec Customers
For organisations already using Bustec products, the ProDAQ 6400 represents a natural extension of the existing platform.
Current LXI customers can add high-performance PXIe measurement capability while continuing to work within the same distributed architecture.
Existing VXI users can modernise gradually without replacing operational systems overnight.
DAAS users continue to benefit from a familiar software environment while expanding the hardware available within their measurement network.
This investment protection is particularly valuable in aerospace and defence programmes where systems may remain operational for decades.
Future-Proofing Mission-Critical Test Systems
Technology changes rapidly.
Aircraft programmes, defence systems and research facilities do not.
The ProDAQ 6400 has been developed with long-term lifecycle support in mind, allowing organisations to build measurement systems that remain relevant as projects evolve.
By combining:
- Open standards
- Ethernet networking
- FPGA technology
- Modular PXIe instrumentation
- The Bustec LXI ecosystem
engineers gain a platform designed to adapt alongside future requirements rather than requiring wholesale replacement.
Modern test facilities demand more than a fast measurement chassis.
They require an architecture capable of supporting distributed measurements, deterministic synchronisation and long-term scalability without compromising measurement quality.
That is the philosophy behind the ProDAQ 6400.
Rather than building another conventional PXIe mainframe, Bustec has created an LXI platform that harnesses the flexibility of PXIe measurement technology while remaining fully integrated within the wider Bustec ecosystem.
For aerospace, defence, energy and research organisations, this provides the best of both worlds: the performance of modern modular instrumentation combined with the openness, scalability and investment protection of an LXI architecture.
As test systems continue to grow in complexity, the question is no longer LXI or PXIe?
The better question is:
Why not combine the strengths of both?
