Product category:
Sensors and Data Acquisition
News Release from: National Instruments | Subject: NI USB-6281 and USB-6289
Edited by the Electronicstalk Editorial
Team on 20 March 2008
USB acquisition devices boost resolution
The onboard 18bit ADC provides a 4x increase in resolution over traditional 16bit devices, equivalent to more than 5.5 digits of resolution for DC measurements.
New M Series USB data acquisition (DAQ) devices from National Instruments feature 18bit analogue input accuracy at sampling rates up to 625Ksample/s 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
This article was originally published on Electronicstalk on 21 Mar 2001 at 8.00am (UK)
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An onboard lowpass 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 980uV at a range of +/-10V and 28uV at a range of +/-100mV at a sampling rate of up to 625Ksample/s.
The USB-6281 features 16 single-ended (SE) and eight differential input (DI) analogue input channels, two analogue output channels and 24 digital I/O (DIO) channels, while the USB-6289 features 32 SE and 16 DI analogue input channels, four analogue output channels and 48 DIO channels.
Both devices offer 18bit analogue inputs at up to 625Ksample/s (500Ksample/s when scanning) and 16bit analogue output at 833Ksample/s.
High-accuracy USB-628x devices also provide enhanced waveform generation.
Engineers can now define custom offset and range settings for analogue output and maximise the 16bit output resolution around a fixed DC offset to generate a more accurate representation of small signals and increase the accuracy of analogue waveforms.
High-accuracy NI M Series multifunction DAQ devices are ideal for applications including device test and characterisation and for sensor and signal measurements requiring instrument-class accuracy.
Applications that can now benefit from the higher accuracy 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 ideal for electronics characterisation and research.
Unlike typical multifunction USB data acquisition 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 data acquisition device can sustain only a single high-speed data stream, effectively making it a single-function device.
The new USB-628x devices are shipped with NI-DAQmx driver software and NI LabView SignalExpress LE, an interactive measurement workbench for quickly acquiring, analysing 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 3000 measurement examples; device simulation; and connection diagrams. Request a free brochure from National Instruments ...
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