NI PXI-5122
NI PXI-5122
NI PXI-5122
NI PXI-5122

NI PXI-5122 | PXI Digitizer / Oscilloscope Module

  • Brand:​ National Instruments
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    Model:​ PXI-5122
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    Product Type:​ PXI Digitizer / Oscilloscope Module
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    Series:​ PXI
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    Core Function:​ Provides high-resolution data acquisition for precision time-domain and frequency-domain measurements.
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    Key Specs:​ 2 channels, 14-bit resolution, 100 MS/s sampling rate, 100 MHz bandwidth.
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Description

PXI-5122: Product Overview
The National Instruments PXI-5122 is a high-resolution digitizer module designed for PXI-based test systems requiring precise signal acquisition with exceptional amplitude accuracy. This instrument functions as a digital oscilloscope replacement, providing 14-bit resolution for applications demanding high dynamic range and accurate representation of signal details. The module serves as a critical component in automated test systems where measurement fidelity is paramount, particularly for characterizing small signal variations, low-level noise, and harmonic content in the presence of large signals.
Installed in a PXI chassis, the module operates with two simultaneously sampled channels, each featuring independent 14-bit analog-to-digital converters. This architecture provides 16,384 discrete quantization levels, significantly more than traditional 8-bit oscilloscopes, enabling accurate capture of subtle signal details that would be lost in lower-resolution systems. The 100 MS/s maximum sampling rate combined with 100 MHz analog bandwidth ensures faithful reproduction of fast signal transitions while the high resolution maintains amplitude accuracy across the entire measurement range. Each channel includes software-selectable input ranges and coupling options, allowing optimization for various signal levels from low-level sensor outputs to higher-voltage system signals.
As part of the PXI platform, this digitizer integrates with other instrumentation modules including signal generators, digital I/O, and switching modules to create complete test solutions. The module supports advanced triggering options including edge, window, and video triggering, enabling precise capture of specific signal events. The combination of high resolution and PXI platform integration makes this instrument suitable for applications requiring both measurement accuracy and system scalability, from research and development laboratories to production test environments.

NI PXI-5122

NI PXI-5122

PXI-5122: Technical Specifications
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    Model Number:​ PXI-5122
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    Manufacturer:​ National Instruments
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    Product Type:​ PXI Digitizer / Oscilloscope Module
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    Number of Channels:​ 2 simultaneously sampled channels
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    Maximum Sampling Rate:​ 100 MS/s
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    Resolution:​ 14 bits
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    Bandwidth:​ 100 MHz (-3 dB)
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    Input Ranges:​ Software-selectable from ±0.1 V to ±40 V full scale
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    Input Impedance:​ 1 MΩ ± 1% || 13 pF or 50 Ω (software selectable)
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    Memory Depth:​ 256 MB per channel standard
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    Dynamic Range:​ >75 dB SFDR (Spurious-Free Dynamic Range)
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    Accuracy:​ ±1.5% of reading ±1.5% of range (typical)
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    Coupling:​ AC/DC/GND (software selectable)
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    Triggering:​ Edge, window, video, and digital triggering
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    Trigger Sensitivity:​ <10 mV
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    Data Transfer:​ PXI Direct Memory Access (DMA)
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    Synchronization:​ PXI trigger lines, 10 MHz reference clock
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    Operating Temperature:​ 0°C to 55°C
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    Power Consumption:​ 7 W typical

    NI PXI-5122

    NI PXI-5122

Core Features & Customer Value
High-Resolution Signal Acquisition: The 14-bit resolution provides significantly better amplitude accuracy compared to standard 8-bit measurement systems, with 16 times more quantization levels. This enhanced resolution enables accurate characterization of small signal variations, low-level noise, and harmonic distortion components that are critical for precision measurements in audio testing, vibration analysis, and power quality monitoring. The improved dynamic range allows measurement of small signals in the presence of large amplitudes without range switching.
Deep Acquisition Memory: The substantial onboard memory per channel supports extended data capture at the maximum sample rate, enabling detailed analysis of transient events or long-duration signals. The memory organization allows for both single-shot acquisitions of complex waveforms and continuous streaming applications. This capability is particularly valuable for applications requiring high sample rates over extended periods, such as recording communication signals or capturing infrequent transient events.
Advanced Triggering System: The sophisticated triggering capabilities extend beyond simple threshold detection to include window and video triggering, enabling isolation of specific signal conditions within complex waveforms. The precision triggering system reduces the amount of data that needs to be stored and processed by capturing only the events of interest. This is especially useful for debugging intermittent problems or analyzing specific portions of complex signals in communication systems and power electronics.
Typical Applications
In audio and acoustics testing, the module performs precise distortion measurements and frequency response analysis with sufficient resolution to characterize harmonic distortion components 80-100 dB below the fundamental frequency. The high dynamic range ensures accurate signal-to-noise ratio measurements for microphone calibration and speaker testing applications.
For power electronics analysis, the digitizer captures switching waveforms in motor drives and power supplies, measuring small voltage variations across switching devices with high timing accuracy. The 14-bit resolution enables accurate calculation of switching losses and harmonic analysis for efficiency optimization in power conversion systems.
In communications system testing, the instrument analyzes modulated signals with high fidelity, supporting demodulation accuracy measurements and error vector magnitude analysis. The combination of high bandwidth and resolution provides accurate representation of both amplitude and phase characteristics in RF and microwave communication systems.

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