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Multifunction USB DAQ devices claims high accuracy

Posted: 25 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:USB DAQ devices? analog output? amplifier? LabVIEW?

National Instruments has rolled a new line of M Series USB DAQ devices with 18bit analog input accuracy at sampling rates up to 625KSps.

The NI USB-6281 and USB-6289 feature an 18bit ADC, which provides a 4x increase in resolution over traditional 16bit devices, equivalent to more than 5.5 digits of resolution for DC measurements. These devices also offer enhanced analog output channels that feature programmable range and offset settings. In addition to standard screw terminal or mass termination connectivity options, board-only OEM versions are also available for integration with embedded systems and include 34- and 50-pin insulation-displacement connectors (IDC) for easy board mating.

Improved solutions
To ensure accuracy at all available sampling rates, these devices incorporate the NI-PGIA 2 custom amplifier and NI-MCal self-calibration to minimize settling time and guarantee maximum accuracy. An onboard low-pass filter can be programmatically enabled to further improve measurement accuracy by eliminating high frequency noise. With the NI USB-628x devices, engineers can deliver an absolute accuracy of 980?V at a range of 10V and 28?V at a range of 100mV at a sampling rate of up to 625KSps.

The USB-6281 features 16 single-ended (SE) and eight differential input (DI) analog input channels, two analog output channels and 24 digital I/O (DIO) channels, while the USB-6289 features 32 SE and 16 DI analog input channels, four analog output channels and 48 DIO channels. Both devices offer 18bit analog inputs at up to 625KSps (500KSps when scanning) and 16bit analog output at 833KSps. High-accuracy USB-628x devices also provide enhanced waveform generation. Engineers now can define custom offset and range settings for analog output and maximize the 16bits of output resolution around a fixed DC offset to generate a more accurate representation of small signals and increase the accuracy of analog waveforms.

The NI M Series multifunction DAQ devices are suited for applications including device test and characterization and for sensor and signal measurements requiring instrument-class accuracy. Applications include scientific instrumentation such as geological monitoring, materials analysis, environmental sensing, calorimetry, optics, spectroscopy, structural sensing and gas detection, along with medical device instrumentation such as heart rate monitoring. USB-628x devices are also suited for electronics characterization and research.

Unlike typical multifunction USB DAQ devices, NI M Series USB DAQ devices incorporate NI signal streaming, a patent-pending technology that provides multiple bidirectional high-speed data streams over USB. NI signal streaming, combined with the error correction, noise rejection, power management and power distribution inherent to the USB protocol, yields a flexible, secure and reliable bus. Without NI signal streaming, a multifunction DAQ device can sustain only a single high-speed data stream, making it a single-function device.

The USB-628x devices are shipped with NI-DAQmx driver software and NI LabVIEW SignalExpress LE, an interactive measurement workbench for quickly acquiring, analyzing and presenting data without additional programming. The NI-DAQmx driver also provides time-saving features such as code generation for both the LabVIEW graphical development environment and text-based languages such as ANSI C/C++, C#, Visual Basic .NET and Visual Basic 6.0; more than 3,000 measurement examples; device simulation; and connection diagrams.

Prices start at $1,949 for the NI USB-6281 and at $2,499 for the NI USB-6289.





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