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A 'universal measurement device'

Posted: 29 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:national instruments? ni? digitizer? pxi-5922?

National Instruments (NI) disclosed that design and test engineers can now use a single modular instrument to make a wide range of dynamic measurements with its new flexible resolution digitizer.

According to the press release, the PXI-5922 digitizer revolutionizes dynamic measurements with a universal measurement device. Engineers can combine the module with NI's LabVIEW 7.1 to create numerous types of instruments, such as AC voltmeters, audio analyzers, frequency counters, spectrum analyzers or I/Q modulation analyzers, that often exceed the measurement performance of high-end traditional instruments with similar functionality, explained the company.

"Virtual instrumentation redefined how test and measurement systems were built," said NI president and CEO Dr. James Truchard. "The PXI-5922 flexible resolution digitizer redefines how the hardware for virtual instrumentation is built by providing a device that spans many different applications. This module ensures error-free measurements for the broadest set of applications of any digitizer and takes us a long way toward our goal of a universal instrument measurement platform," Truchard added.

Unlike traditional measurement devices that have a fixed resolution for all sample rates, the new digitizer uses the NI FlexII ADC that has flexible resolution and can sample anywhere from 16 bits at 15MS/s to 24 bits at 500kS/s. The NI FlexII ADC incorporates patented NI methods for reducing the linearity and temperature drift errors inherent to multi-bit sigma-delta converters to achieve unprecedented dynamic range at high sample rates, explained NI. With the module's large dynamic range and low noise, design and test engineers can directly digitize low-level signals without the need for external signal conditioning. Reduced signal conditioning improves measurement accuracy and reliability while also saving test system development time, added the company.

The PXI-5922 is built on the Synchronization and Memory Core (SMC) architecture for tight synchronization with other SMC-based products such as high-speed digitizers, arbitrary waveform generators and digital waveform generator/analyzers. This gives the module multiple instrument synchronization with module-to-module skew of less than 1ns typical; deep, flexible onboard memory up to 256MB per channel; and high-speed data streaming. In addition, NI said, engineers can use the module to create mixed-signal stimulus response measurements or to expand the number of acquisition channels up to 1,632 channels by synchronizing multiple NI PXI-5922 modules.

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