Complex Testing with 6-Axis Load Cells and BX8 DAQ Instrumentation

Advanced testing applications often require the simultaneous measurement of complex, multi-directional loads. In environments that require complex measurement analysis, such as sophisticated aerospace structural tests, fast-paced robotics development, life-saving medical device R&D, and critical vehicle safety, forces do not act along a single axis.

Traditional testing methods rely on nesting multiple single-axis sensors, a practice that introduces mechanical stack-up errors, increased mass, and alignment complexities. With sensor technologies designed for multi-component test and measurement requirements, the test and measurement industry is shifting toward integrated solutions that provide more data to enable real-time decisions and deliver critical information for analysis.

The solution for complex testing requirements is to take advantage of the advanced capabilities of multi-axis configurations, achieved by combining an Interface 6-Axis Load Cell with a high-speed BX8 Data Acquisition System (DAQ).

Defining the Multi-Axis System Architecture

A complete multi-axis measurement system consists of a specialized sensor, such as the Interface 6A Series or the 6ADF DIN Flange-Type 6-Axis Load Cell, capable of capturing forces along three mutually perpendicular axes and torques about those same axes. The sensor uses independent internal strain gauge bridges to output multiple millivolt-per-volt signals simultaneously. Because physical loads on a multi-axis structure inherently cause mechanical crosstalk across channels, raw signals cannot be read independently without mathematical correction.

To resolve this, the system relies on high-speed data acquisition instrumentation, such as the Interface BX8-HD44 BlueDAQ Series Data Acquisition System for Multi-Axis Sensors. This data acquisition instrument features eight synchronized channels that sample data simultaneously up to 48kHz per channel with 24-bit internal resolution. By pairing the 6-Axis Load Cell directly with the BX8 DAQ, this architecture eliminates multiplexing delays, ensuring that transient events across all six axes are captured at the exact same moment in time.

TIP: Explore Interface’s Multi-Axis Fundamentals Guide for detailed information about setup, design, calibration, and features.

Mathematical Hardware Processing

The defining shift in test and measurement dynamics is where and how multi-axis math calculations occur. Historically, raw data was saved and processed post-test using external software scripts. Advanced instrumentation handles these calculations at the hardware level.

During system calibration, a unique 36-term or 72-term coefficient matrix is generated for the specific 6-Axis Load Cell. This matrix defines the exact mathematical relationship between the raw output of each bridge and the true applied load. Using the BlueDAQ software interface, this matrix is loaded directly into the internal memory of the BX8 DAQ.

The BX8 DAQ processes these complex calculations internally. As a result, the device automatically eliminates crosstalk and actively scales its independent analog outputs according to the true computed forces and moments. This hardware calculation allows test engineers to view accurate data live during testing, trigger hardware safety shutdowns immediately if limits are exceeded, and output clean signals directly to external control loops.

Technical Benefits in Dynamic Testing Using Advanced Multi-Axis Complete Systems

Implementing an integrated Interface 6-Axis Load Cell and BX8 DAQ system provides several distinct technical advantages over fragmented configurations.

• High-Speed Synchronized Throughput: The BX8 DAQ samples at 48kHz per channel across all inputs, ensuring high fidelity in dynamic and high-impact testing environments.
• Hardware Isolation and Signal Integrity: The BX8 DAQ features full galvanic isolation between analog inputs, analog outputs, digital inputs and outputs, and the PC interface to prevent ground loops and electrical noise from degrading data.
• Sensor Versatility: The BX8 DAQ accepts a broad range of inputs beyond standard multi-axis strain gauges, including individual quarter and half-bridge completion, voltage outputs, and PT1000 temperature sensors.
• Standardized Data Export: BlueDAQ software records data in high-efficiency binary TDMS formats, which can be directly converted to text or CSV for advanced structural analysis.

Interface 6-Axis Complete Systems

Interface offers a range of 6-Axis Load Cells and Instrumentation that are available for system calibration.  Here are three examples of Multi-Axis Complete Systems that are ready for easy implementation and set-up.

• 6A55RI 6-Axis Robot Flange Force-Torque Sensor System
• 6A Series 6-Axis Standard Capacity Load Cells – Fx Fy Fz Mx My Mz and BX8-AS BlueDAQ Series Data Acquisition System with Industrial Enclosure
• 6ADF Series 6-Axis DIN Flange-Type Load Cells and BX8-HD44 BlueDAQ Series Data Acquisition System for Multi-Axis Sensors with Lab Enclosure System

Industry Applications and Shifting Dynamics for Multi-Axis and DAQ Systems

The integration of multi-axis calculation has rewritten testing protocols across several advanced engineering sectors.

In robotics and automation, the 6ADF DIN Flange-Type 6-Axis Load Cell mounts directly to the wrists of industrial arms. The compact, low-profile design allows automated systems to monitor precise insertion forces and complex tool torques without altering robot kinematics. Feedback from the BX8 DAQ enables adaptive force control, allowing robots to perform delicate tasks like polishing or component assembly.

The aerospace and defense industries utilize these systems for wind tunnel testing, rocket thrust stands, and flight control surface evaluation. In these applications, aerodynamic lift, drag, side forces, pitch, roll, and yaw must be recorded simultaneously. The BX8 DAQ’s ability to calculate these values instantly ensures that rapid changes in airflow or structural load do not cause data skew.

Automotive testing departments rely on the 6A Series 6-Axis Load Cell for tire durability testing, suspension force analysis, and component crash testing. Understanding how energy dissipates across multiple planes during an impact requires both the mechanical robustness of an Interface 6-Axis Load Cell and the precise high-speed synchronization of the BX8 DAQ.

By moving matrix math processing out of post-test computing and directly into high-speed hardware, these integrated systems allow engineers to interact with precise, cross-talk-corrected data immediately, speeding up development cycles and increasing safety margins across critical applications.

6-Axis and BX8 Solve Advanced Testing Challenges

Integrated multi-axis testing solutions represent a fundamental shift away from complex, multi-sensor hardware nests and post-test software processing. Combining an Interface 6-Axis Load Cell with the high-speed processing power of the BX8 DAQ moves matrix math calculations directly into the hardware layer. This configuration successfully eliminates channel cross-talk, provides fully synchronized high-speed sampling at 48kHz, and delivers cross-talk-corrected outputs in real time. For industries managing highly complex structural forces, this streamlined architecture reduces development cycles, protects expensive test articles, and ensures absolute data integrity.

To implement a multi-axis measurement system or to update your existing laboratory instrumentation, contact an Interface application engineer to discuss a complete system solution.