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PXI Express DAQ packs signal conditioning

Posted: 27 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:PXI Express? DAQ? signal conditioning?

National Instruments has launched DAQ modules with integrated signal conditioning for scalable, high-performance measurements on PXI Express.

The new NI SC Express family delivers increased accuracy, high data throughput and best-in-class synchronization for measuring strain gauges, bridge-based transducers, thermocouples and high-voltage analog inputs. PXI Express provides 250MBps of dedicated bandwidth for each SC Express module in the chassis, which helps engineers increase channel count without compromising sampling rates or data throughput. With a smaller footprint, simplified cable management and new software features for automatic synchronization, the SC Express modules make it easy for engineers to set up and program high-channel-count sensor measurement systems.

The NI PXIe-4330 24bit simultaneous bridge input module offers 0.02 percent accuracy and 25kSps per channel sample rate for high-performance strain, load, force and torque measurements. The bridge input module achieves high accuracy with a ratiometric design where the ADC references the excitation voltage. This approach removes the measurement's dependence on the stability and accuracy of the excitation voltage. In addition, unique delta-sigma ADCs provide both excellent AC performance as well as DC accuracy, while traditional delta-sigma ADCs only offer AC performance.

The NI PXIe-4330 bridge input module can perform quarter, half and full bridge-based measurements with automatic synchronization features. The included driver software ensures tight synchronization across multiple modules and chassis with inter-channel skews as low as 5 ppb. The 8-channel bridge input module can scale to a 136-channel system in a single chassis and thousands of channels when synchronizing across multiple chassis. The high-accuracy, simultaneity and synchronization features make the NI PXIe-4330 module ideal for high-channel-count structural test applications, such as wind tunnels, bridge monitoring and crash tests.

With the NI PXIe-4353 thermocouple module, engineers can measure temperatures with 0.30C accuracy on 32 channels. The isothermal terminal block minimizes error with a unique design that optimizes thermal conductivity, making it possible for the nearby cold-junction compensation thermistors to accurately measure at the thermocouple junctions. The 32-channel thermocouple module can scale to a 544-channel system in a single chassis and thousands of channels when synchronizing across multiple chassis. The increased accuracy and scalable platform make the NI PXIe-4353 module well-suited for precision measurements from a single channel to large systems for applications such as fuel cell testing and monitoring thermal chambers.

The NI PXIe-4300 high-voltage isolated analog input module is the first analog input module from National Instruments that can measure up to 300 V with simultaneous sampling. With a 16bit ADC per channel and a 250kSps per channel sampling rate, the NI PXIe-4300 module can stream 4MBps per module and 68MBps in a single chassis. This eight-channel analog input module can scale to a 136-channel system in a single chassis and thousands of channels when synchronizing across multiple chassis. The ability to measure 300 with CAT II channel-to-channel isolation makes the NI PXIe-4300 module ideal for automotive testing, such as fuel cell and battery tests.

The new SC Express modules include NI-DAQmx driver software and support for multi-device tasks, a new feature of NI-DAQmx that helps engineers easily synchronize multiple modules. The same code that acquires data from one module can synchronize up to 17 modules in a chassis. The modules work with a variety of NI hardware including NI X series, dynamic signal acquisition and NI SCXI products, and more than 1,500 types of I/O available on the PXI platform. The new modules also integrate with NI software including NI LabVIEW and the LabVIEW Real-Time Module, NI-Sync and NI DIAdem.

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