NI Debuts PXI-4461 24-bit Analog Input/Output Data Acquisition Module

4/14/2004 - National Instruments announced the NI PXI-4461, the industry’s first 24-bit analog input/output data acquisition module for the PXI platform. With the release of this module, engineers now can simultaneously generate and acquire high-accuracy dynamic signals for sound and vibration measurements.

“We chose the NI PXI-4461 as the cornerstone of our audio test platform because of its rich feature set and outstanding accuracy,” said Juan Reyes, application engineer for Sony Audio Division in Mexico. “The 120 dB dynamic range of the PXI-4461 enables us to perform audio tests faster and with greater accuracy than any other audio test products available.”

The PXI-4461 module features 24-bit delta sigma converters that deliver nearly 120 dB dynamic range over an input bandwidth of 92 kHz at 204.8 kS/s. Its two differential output channels generate frequencies up to 92 kHz, making it ideal for shaker control and stimulus response tests such as swept-sine. To ensure the highest accuracy for precision audio measurements, the PXI-4461 dynamic signal acquisition module includes differential inputs, anti-aliasing protection and integrated electronic piezoelectric (IEPE) conditioning for microphones and accelerometers.

“National Instruments is dedicated to offering customers the latest technology available,” said Tim Dehne, NI senior vice president of research and development. “We continue to advance our dynamic signal acquisition hardware by offering 24-bit generation capabilities in addition to 24-bit analog acquisition. With this new DSA module for PXI, engineers can use the PXI platform to make state-of-the-art, high-precision audio measurements.”

To speed development of sound and vibration applications, engineers can combine the PXI-4461 module with NI LabVIEW 7 Express graphical development software and the new LabVIEW Sound and Vibration Toolkit 3.1, which provides 50 ready-to-run examples. Engineers can use these tools to create complete systems for frequency response measurements, swept-sine analysis or distortion characterization in applications such as noise, vibration and harshness (NVH) testing and audio testing.

About National Instruments
National Instruments ( is a technology pioneer and leader in virtual instrumentation – a revolutionary concept that has changed the way engineers and scientists approach measurement and automation. Leveraging the PC and its related technologies, virtual instrumentation increases productivity and lowers costs through easy-to-integrate software, such as the NI LabVIEW graphical development environment, and modular hardware, such as PXI modules for data acquisition, instrument control and machine vision. Headquartered in Austin, Texas, NI has more than 3,100 employees and direct operations in 40 countries. In 2003, the company sold products to more than 25,000 companies in 90 countries. For the past five years, FORTUNE magazine named NI one of the 100 best companies to work for in America.

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