PXI-5922: Product OverviewThe National Instruments PXI-5922 is a flexible-resolution digitizer module designed for the PXI platform, specializing in high-dynamic-range signal acquisition across a wide range of sampling rates. This instrument utilizes a sigma-delta analog-to-digital converter architecture that provides software-selectable resolution, allowing users to optimize the trade-off between sampling speed and measurement precision. Its primary function is to digitize analog signals with exceptional amplitude accuracy, making it suitable for applications requiring precise measurement of low-level signals, dynamic signals with wide amplitude ranges, or spectral analysis with high frequency resolution.Installed in a PXI chassis, the module operates by simultaneously sampling two input channels with resolution that varies from 24 bits at lower sampling rates to 16 bits at the maximum sampling rate. This adaptive resolution capability enables the same instrument to perform high-precision DC measurements and dynamic AC measurements with optimized performance for each application. The architecture provides anti-aliasing filtering and high linearity, ensuring accurate signal representation across the entire operating range. The module is particularly valuable for applications where signal amplitude varies significantly or where both small signal details and large signal components must be accurately captured.
Core Features & Customer ValueFlexible Resolution Architecture: The sigma-delta converter architecture provides software-selectable resolution that automatically adjusts with sampling rate, offering 24-bit resolution at lower sampling rates for high-precision measurements and 16-bit resolution at the maximum 500 kS/s rate for faster dynamic measurements. For engineers, this means a single instrument can replace multiple measurement devices, providing both high-precision DC measurements and adequate dynamic performance for AC signals. The benefit is reduced system complexity and cost while maintaining measurement optimization for different signal types.High Dynamic Range Performance: The greater than 110 dB dynamic range enables accurate measurement of small signals in the presence of large signals, which is critical for applications such as audio testing, vibration analysis, and communications system testing. This capability allows engineers to characterize harmonic distortion, intermodulation products, and noise floors without requiring range switching or external attenuation. The high linearity ensures that amplitude measurements remain accurate across the entire input range.Integrated Anti-aliasing Protection: The built-in anti-aliasing filters automatically adjust with sampling rate changes, providing protection against aliasing without requiring manual filter selection or external filtering components. This feature ensures that signals are properly conditioned for the selected sampling rate, reducing measurement errors and simplifying system configuration. The automatic adjustment eliminates the need for manual filter changes when modifying acquisition parameters.Typical ApplicationsIn audio and acoustics testing, the module performs precise distortion measurements, frequency response analysis, and signal-to-noise ratio measurements with high amplitude accuracy across the audio frequency spectrum.For vibration and structural analysis, the digitizer acquires data from accelerometers and strain gauges with sufficient dynamic range to capture both large primary vibrations and small harmonic components for modal analysis and structural health monitoring.In power quality analysis, the instrument simultaneously monitors voltage and current waveforms with high resolution to characterize harmonics, interharmonics, and flicker in electrical power systems.
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Full 12-month warranty on all components
