PXI-5122: Product OverviewThe National Instruments PXI-5122 is a high-resolution PXI digitizer module designed for applications requiring precise time-domain and frequency-domain measurements. This module functions as a dual-channel oscilloscope within a PXI system, providing 14-bit resolution for high-fidelity signal acquisition. The instrument is engineered for applications in research and development, production test, and condition monitoring where capturing detailed signal characteristics with low noise is essential.Installed in a PXI chassis, the module operates by simultaneously sampling analog input signals across both channels at rates up to 100 megasamples per second (MS/s). Each channel features independent analog-to-digital conversion with 14-bit resolution, ensuring accurate representation of signal details and excellent dynamic range. The architecture includes deep onboard memory (256 MB per channel standard) for capturing long-duration signals or high-speed transients, with flexible sampling rate selection to optimize the trade-off between acquisition duration and time resolution. The module supports both software and hardware triggering for precise acquisition control.
NI PXI-5122
PXI-5122: Technical Specifications
• Model Number: PXI-5122
• Manufacturer: National Instruments
• Product Type: PXI Digitizer Module
• Number of Channels: 2 simultaneous sampling channels
• Maximum Sampling Rate: 100 MS/s
• Resolution: 14 bits
• Bandwidth: 100 MHz (-3 dB)
• Input Range: ±10 V (software selectable)
• Input Impedance: 1 MΩ || 13 pF, 50 Ω
• Memory: 256 MB per channel standard (512 MB total)
• Spurious Free Dynamic Range (SFDR): >75 dBc
• Coupling: AC/DC/GND (software selectable)
• Triggering: Software, analog, digital, video, and window triggering
Core Features & Customer ValueThe primary value of the PXI-5122 lies in its high resolution and excellent signal fidelity. The 14-bit resolution provides 16,384 discrete levels of measurement precision, significantly better than traditional 8-bit oscilloscopes. This enhanced resolution enables accurate characterization of small signal variations, low-level noise measurements, and detailed harmonic analysis that would be lost in lower-resolution instruments.The module’s deep onboard memory allows for extended data capture at high sampling rates, enabling detailed analysis of transient events or continuous monitoring of dynamic systems. The flexible memory allocation supports both single-shot acquisitions of long-duration signals and continuous streaming applications. The multiple triggering options support complex acquisition scenarios, including pre-trigger and post-trigger configuration for capturing signal events that occur before or after a trigger condition.The flexible input configuration with software-selectable coupling, impedance, and voltage ranges provides measurement versatility, allowing the same module to handle both low-level sensor signals and higher-voltage system signals without external conditioning. The excellent dynamic range with greater than 75 dBc SFDR ensures accurate measurements in the presence of large signals or when analyzing small signal components in the presence of larger carriers.Typical ApplicationsIn power electronics testing, the module captures detailed voltage and current waveforms for efficiency calculations, harmonic analysis, and switching loss measurements in motor drives and power converters.In audio and vibration analysis applications, the high resolution enables precise measurement of low-level signals from microphones, accelerometers, and other transducers for acoustic and structural analysis.For communications system testing, the digitizer analyzes modulated signals with high fidelity, supporting demodulation and signal quality measurements for various communication protocols.
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