PXIe-5171: Product OverviewThe National Instruments PXIe-5171 is a high-performance PXI Express digitizer module that functions as a multi-channel oscilloscope for automated test and measurement systems. This instrument provides eight synchronized input channels, each capable of high-speed signal acquisition with 14-bit resolution, making it suitable for applications requiring precise time-domain and frequency-domain analysis of complex signals.Installed in a PXI Express chassis, the module serves as the core data acquisition component in systems requiring simultaneous multi-channel measurement. It operates by sampling analog input signals at rates up to 1 gigasample per second across all channels, with adjustable sampling rates and memory depth to optimize for specific measurement scenarios. The high-resolution 14-bit analog-to-digital converters provide greater dynamic range and accuracy compared to traditional 8-bit oscilloscopes, enabling detailed analysis of signal characteristics and subtle anomalies.
NI PXIe-5171
PXIe-5171: Technical Specifications
• Model Number: PXIe-5171
• Manufacturer: National Instruments
• Product Type: PXI Express Digitizer
• Number of Channels: 8 simultaneously sampled channels
• Resolution: 14 bits
• Bandwidth: 250 MHz (-3 dB)
• Maximum Sampling Rate: 1 GS/s (aggregate), 250 MS/s per channel simultaneously
• Input Range: ±100 mV to ±10 V full scale (software-selectable)
• Input Impedance: 1 MΩ ± 1% || 16 pF ± 2 pF
• DC Accuracy: ±1.5% of reading ±1.5% of range (typical)
• Memory: 256 MS/channel standard (up to 512 MS optional)
• Triggering: Advanced digital triggering (edge, window, hysteresis, runt)
Core Features & Customer ValueThe PXIe-5171 delivers significant value through its high channel density and synchronization capabilities. The eight fully synchronized channels enable simultaneous measurement of multiple signals with precise timing relationships, which is essential for applications like multi-phase power analysis, array sensor processing, and MIMO communications system testing. The 14-bit resolution provides 16 times more amplitude resolution than standard 8-bit oscilloscopes, allowing engineers to detect small signal variations and noise components that would be lost in lower-resolution systems.The module’s flexible acquisition memory allows users to balance sampling rate and record length based on their specific needs, from capturing long-duration signals at lower rates to brief transients at the maximum 1 GS/s rate. The advanced digital triggering system includes features like window triggering and runt triggering that help isolate specific signal events of interest without capturing excessive irrelevant data. Integration with the PXI Express backplane ensures high-throughput data transfer to the system controller for real-time processing or storage, while the built-in synchronization capabilities enable multi-module systems with precise timing alignment.Typical ApplicationsIn radar system testing, the PXIe-5171 captures multiple intermediate frequency (IF) signals simultaneously with precise timing, enabling characterization of beamforming parameters and pulse compression algorithms.In power electronics validation, the module measures voltage and current waveforms across multiple phases of motor drives or power inverters, providing the synchronized data needed for efficiency calculations and harmonic analysis.For communications system design, the digitizer captures I and Q baseband signals with sufficient resolution to evaluate modulation accuracy and error vector magnitude in emerging wireless standards.
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