Campbell Scientific’s vehicle data acquisition (DAQ) systems have a proven history of operating at the edge of performance in the vehicle testing environment. This includes extreme and repetitive temperature testing cycles, remote over-the-road testing, and environmental fatigue testing. Systems typically measure temperature, pressure, loads, and strains; and they monitor the vehicle data bus with general-purpose Controller Area Network (CAN) channels. Our systems are rugged, versatile, portable, and reliable. They are compatible with a wide variety of sensors with multiple wireless and wired communication capabilities including cellular, Bluetooth, Wi-Fi, and Ethernet.
A distributed DAQ for vehicle testing lowers the total cost of instrumentation with shorter sensor cable lengths, reduced cable costs, fewer vehicle modifications, and decreased sensor installation time—all with less cable to route. This unique design also improves measurement fidelity with reduced signal interference because components are located closer to the point of measurement.
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The GRANITE™10 Data-Acquisition System was designed with vehicle testing in mind. As Campbell Scientific’s most computationally powerful data-acquisition system, the GRANITE™10 is the core of the vehicle testing data-acquisition network. Providing four general-purpose CAN channels, the GRANITE™10 is CAN bus and CAN FD compatible. When integrated with the GRANITE™ measurement modules, a complete system is capable of measuring temperature, strain, pressure, load, and many other parameters. The GRANITE ™10 DAQ can support multiple measurement rates simultaneously, ranging from every few hours to more than 10,000 measurements per second. Measurement types, processing algorithms, and recording intervals are also programmable. The GRANITE™10 CAN bus allows time-synchronized storage of vehicle computer data with independently measured data from the GRANITE™ DAQ.
On-board instruction sets contain programmed algorithms that process measurements and output results in the desired engineering units. For example, data can be displayed as rainflow or level-crossing histograms. These rainflow and level-crossing algorithms allow processing for extended periods, not just a limited number of cycles. Our instruction sets also allow unattended measurement and control decisions based on time or conditional events.
The modular architecture of our GRANITE™ system allows each measurement module to independently connect directly to a PC or DAQ. As an independent module, the real-time measurements can be displayed directly on the PC. One or more measurement modules can be connected to the GRANITE™10 DAQ to create the perfect networked configuration for each application. When connected, they form a time-synchronized, distributed data-acquisition system.
Multiple GRANITE™ measurement modules can be distributed throughout the vehicle. Each module is connected to a central GRANITE™10 DAQ. This networking capability decreases the quantity and lengths of the sensor cables between the sensors and the GRANITE™10. Fewer sensor cables reduces cost, improves system simplification, and lessens the risk of signal corruption from noise.
Synchronization is key to the success of a distributed network. There are three significant levels to the GRANITE™DAQ synchronization:
Because each of the GRANITE™10 DAQs are compatible with almost every commercially available sensor, our systems give you the freedom to use the sensors that best meet your application. GRANITE™ measurement module channel types include analog (single-ended and differential), temperature (thermocouple and thermistor), bridge, switched excitation, continuous analog output, anti-aliasing filter, and digital input/output (I/O).
Typical sensors used with our systems include thermocouples, pressure transducers, pulse pickups, flow transducers, potentiometers, strain gauges, load cells, digital switches, accelerometers, Linear Variable Differential Transformers (LVDT), and tilt sensors.
Communication interfaces for retrieving, storing, and displaying data include direct connection to a PC or laptop, microSD cards, Ethernet, and several options for wireless communication (including built-in Wi-Fi).
Our PC-based software options support connecting the GRANITE™ measurement modules directly to a PC or scheduling remote, automated data collection from the GRANITE™10. Real-time monitoring and control simplify the entire data-acquisition process, while robust error-checking ensures data integrity. We can even help you post your data to the Internet.
Our data-acquisition systems have been instrumental in testing the following: