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PXI Express DAQ modules with integrated signal conditioning

National Instruments Corporation (UK) Ltdvisit website

 

PXI Express DAQ modules with integrated signal conditioningNational Instruments is introducing the new NI SC Express data acquisition (DAQ) modules with integrated signal conditioning for scalable, high-performance measurements on PXI Express. The NI SC Express family delivers increased accuracy, high data throughput and best-in-class synchronisation for measuring strain gauges, bridge-based transducers, thermocouples and high-voltage analogue inputs. PXI Express provides 250MB/s 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 synchronisation, the SC Express modules are said to make it easy for engineers to set up and program high-channel-count sensor measurement systems.

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

Automatic synchronisation

According to NI, the new NI PXIe-4330 bridge input module can perform quarter, half and full bridge-based measurements with automatic synchronisation features. The included driver software ensures tight synchronisation across multiple modules and chassis with inter-channel skews as low as 5ppb. The eight-channel bridge input module can scale to a 136-channel system in a single chassis and thousands of channels when synchronising across multiple chassis. The high-accuracy, simultaneity and synchronisation features make the NI PXIe-4330 module particularly suitable 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 0.30degC accuracy on 32 channels. The isothermal terminal block minimises error with a special design that optimises thermal conductivity, making it possible for the nearby cold-junction compensation (CJC) thermistors to measure accurately 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 synchronising across multiple chassis. The increased accuracy and scalable platform make the NI PXIe-4353 module is suitable for precision measurements from a single channel to large systems for applications such as fuel cell testing and monitoring thermal chambers.

Measure voltages up to 300V

Another new module, the NI PXIe-4300 high-voltage isolated analogue input module, is the first analogue input module from National Instruments that can measure up to 300V with simultaneous sampling. With a 16-bit ADC per channel and a 250kS/s per channel sampling rate, the NI PXIe-4300 module can stream 4MB/s per module and 68MB/s in a single chassis. This eight-channel analogue input module can scale to a 136-channel system in a single chassis and thousands of channels when synchronising across multiple chassis. The ability to measure 300V with CAT II channel-to-channel isolation makes the NI PXIe-4300 module useful 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, which is a new feature of NI-DAQmx that helps engineers synchronise multiple modules more easily. The same code that acquires data from one module can synchronise up to 17 modules in a chassis. The modules work with a variety of NI hardware including NI X Series, dynamic signal acquisition (DSA) and NI SCXI products, and more than 1500 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.

Go to www.ni.com/lp/sc-express.htm to learn more about achieving higher measurement performance with the SC Express family.

26 May 2010

National Instruments Corporation (UK) Ltdvisit website
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