NI PXI-4462
NI PXI-4462
NI PXI-4462
NI PXI-4462

NI PXI-4462 | PXI Dynamic Signal Acquisition Module

  • Brand:​ National Instruments
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    Model:​ PXI-4462
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    Product Type:​ Dynamic Signal Acquisition (DSA) Module
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    Series:​ PXI
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    Core Function:​ Provides 4-channel high-resolution dynamic signal acquisition with built-in IEPE conditioning for vibration and acoustic measurements.
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    Key Specs:​ 4 simultaneous channels, 24-bit resolution, 204.8 kS/s sampling rate, IEPE excitation.
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Description

PXI-4462: Product Overview
The National Instruments PXI-4462 is a 4-channel dynamic signal acquisition module designed for high-resolution measurement applications requiring precise audio, vibration, and acoustic analysis. This module serves as a complete signal conditioning and digitization solution for IEPE (Integrated Electronics Piezo-Electric) sensors, including accelerometers, microphones, and other dynamic transducers. Its architecture is optimized for applications demanding wide dynamic range and low-noise performance, such as sound pressure level measurements, structural vibration monitoring, and electro-acoustic testing.
Installed in a PXI chassis, the module provides simultaneous sampling across all four input channels, ensuring precise phase relationship preservation for cross-channel measurements like frequency response analysis and operating deflection shape analysis. Each channel incorporates software-selectable AC/DC coupling and programmable constant current excitation (2 mA or 4 mA) for powering ICP®-compatible sensors without external signal conditioning. The 24-bit delta-sigma analog-to-digital converters deliver high amplitude resolution across the entire measurement range, while automatic anti-aliasing filters adapt to the selected sample rate to prevent measurement errors from out-of-band signals.

NI PXI-4462

NI PXI-4462

PXI-4462: Technical Specifications
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    Model Number:​ PXI-4462
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    Manufacturer:​ National Instruments
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    Product Type:​ Dynamic Signal Acquisition Module
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    Number of Channels:​ 4 simultaneously sampled channels
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    Resolution:​ 24 bits
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    Maximum Sampling Rate:​ 204.8 kS/s per channel
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    Dynamic Range:​ 118 dB typical
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    Input Coupling:​ Software-selectable AC/DC
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    IEPE Excitation:​ 2 mA or 4 mA constant current, software-selectable
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    Input Ranges:​ ±316 mV, ±1 V, ±3.16 V, ±10 V (software-selectable)
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    AC Coupling Cutoff:​ 0.5 Hz
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    Anti-aliasing Protection:​ Automatic with sample rate selection
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    Common-Mode Rejection:​ >100 dB at 60 Hz
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    Crosstalk:​ < -120 dB at 1 kHz
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    Connector:​ 68-pin high-density D-Sub
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    Sync Clock:​ 10 MHz reference clock input/output
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    Triggering:​ Analog, digital, and software triggering
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    Operating Temperature:​ 0°C to 55°C
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    Relative Humidity:​ 10% to 90% non-condensing

    NI PXI-4462

    NI PXI-4462

Core Features & Customer Value
High-Resolution Measurement Capability: The 24-bit resolution provides 16.7 million discrete quantization levels, enabling accurate capture of both large and small amplitude signals within the same acquisition. This wide dynamic range (118 dB) allows engineers to measure small harmonic distortion components and noise floors without requiring range switching during measurements. For audio testing applications, this capability supports precise total harmonic distortion (THD) and signal-to-noise ratio (SNR) measurements that comply with international standards such as IEC 60268.
Integrated Sensor Conditioning: The built-in IEPE signal conditioning eliminates the need for external signal conditioners when using piezoelectric sensors. The software-selectable constant current sources (2 mA or 4 mA) provide appropriate excitation for various sensor types and cable lengths, simplifying system integration and reducing overall test system cost. This integrated approach ensures proper signal conditioning for accelerometers, microphones, and other IEPE-compatible transducers commonly used in vibration and acoustic measurements.
Anti-aliasing Protection: The automatic anti-aliasing filters adjust their cutoff frequency based on the selected sample rate, providing protection against out-of-band signals while maintaining passband flatness. This automated filtering eliminates the manual filter selection required with traditional spectrum analyzers and ensures valid measurements across the entire frequency range. The steep filter roll-off prevents aliasing errors that could corrupt frequency domain measurements, which is critical for accurate spectral analysis.
Typical Applications
In product quality validation, the module performs vibration testing on electronic assemblies and mechanical components to verify durability and identify resonant frequencies that could affect product reliability.
For building acoustics testing, it measures sound transmission loss through partitions and evaluates room acoustics parameters according to ISO standards, using simultaneous multi-channel measurements for sound intensity mapping.
In predictive maintenance systems, the module continuously monitors vibration levels on rotating machinery such as pumps, fans, and motors, enabling early detection of bearing wear, imbalance, and misalignment conditions.

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