NI PXI-4462

Description

NI PXI-4462 Product Description

Detailed Parameter Table

NI PXI-4462

Product Introduction

The NI PXI-4462 is a high-channel-count 3U PXI dynamic signal acquisition module designed for large-scale acoustic and vibration measurement systems. As an enhanced version of the PXI-4461, it retains the same high-performance specifications while doubling the channel count to 8, making it ideal for applications requiring simultaneous monitoring of multiple dynamic signals—from multi-point structural vibration testing to array-based acoustic measurements.

This module integrates seamlessly with PXI chassis such as the PXI-1031, leveraging the PXI bus for synchronized operation with controllers, signal generators, and other DSA modules. Its built-in IEPE support eliminates external signal conditioning, simplifying connections to accelerometers, microphones, and other transducers. Whether deployed in automotive NVH testing, aerospace structural analysis, or industrial machinery monitoring, the PXI-4462 delivers low-noise, time-aligned data across all 8 channels, enabling comprehensive dynamic signal analysis.

Core Advantages and Technical Highlights

Expanded Channel Count with Consistent Performance

The PXI-4462 offers 8 differential input channels—twice that of the PXI-4461—without compromising on sampling rate or resolution. This makes it ideal for large-scale testing scenarios, such as monitoring vibrations across an entire engine block or capturing audio from a multi-microphone array in a concert hall. All 8 channels sample simultaneously at up to 204.8 kS/s, ensuring phase-coherent data critical for analyzing complex dynamic interactions.

High-Speed Sampling for Transient Capture

With a 204.8 kS/s sampling rate per channel, the PXI-4462 excels at capturing high-frequency transients, such as impact events or acoustic bursts. In automotive crash testing, for example, it can record vibration spikes from multiple sensors mounted on the vehicle frame, providing detailed data on structural response during impact. The 24-bit resolution ensures that even subtle pre- and post-impact vibrations are captured with exceptional clarity.

Per-Channel IEPE Configuration

Like the PXI-4461, the PXI-4462 features software-selectable 4 mA IEPE excitation, configurable per channel. This flexibility allows mixed use of IEPE and voltage-mode sensors in the same system—for instance, combining IEPE accelerometers with voltage-output microphones in a noise and vibration test. The integrated excitation eliminates the need for external power supplies, reducing system complexity and cost.

Broad Frequency Coverage

With a frequency response from DC to 80 kHz (-3 dB), the PXI-4462 handles a wide range of dynamic signals, from low-frequency structural oscillations (e.g., bridge sway) to high-frequency acoustic emissions (e.g., turbine blade noise). This versatility makes it a single-module solution for multi-frequency testing, eliminating the need to swap modules for different measurement ranges.

Typical Application Scenarios

Automotive NVH Testing

In automotive development, the PXI-4462 is used to measure noise and vibration across multiple points on a vehicle. Engineers mount accelerometers on the engine, suspension, and chassis, while placing microphones inside the cabin. The module’s 8 channels capture simultaneous data, enabling correlation of engine vibrations with cabin noise. This helps identify sources of unwanted noise (e.g., transmission whine) and optimize designs for a quieter ride.

Structural Health Monitoring

Civil engineers use the PXI-4462 to monitor vibrations in large structures such as bridges, dams, and skyscrapers. By distributing 8 sensors across critical points (e.g., bridge supports, building corners), the module captures dynamic responses to environmental forces (wind, traffic) or internal stress. Analysis of the time-aligned data helps detect structural weaknesses, such as resonant frequencies indicating potential fatigue.

Acoustic Array Measurements

In acoustic research, the PXI-4462 supports multi-microphone array systems for sound source localization. For example, in concert hall design, an array of 8 microphones connected to the module maps sound propagation, helping optimize speaker placement or acoustic treatments. The module’s high dynamic range ensures accurate measurements even in complex acoustic environments with overlapping sound sources.

NI PXI-4462

Related Model Recommendations

NI PXI-1031: A 5-slot PXI chassis that houses the PXI-4462 and a controller, providing a compact platform for mid-sized dynamic signal systems. For larger setups, the PXI-1042 (18-slot) offers expanded capacity.

NI PXI-4461: A 4-channel DSA module that complements the PXI-4462 in mixed-channel systems. For example, combining one PXI-4462 (8 channels) with two PXI-4461s (4 channels each) creates a 16-channel system for large-scale testing.

NI PXI-8106: A PXI controller with an Intel Core i7 processor, which processes high-speed data from the PXI-4462 in real time. It runs LabVIEW-based analysis tools for FFTs, order tracking, and acoustic metrics.

NI Sound and Vibration Toolkit: Software that enhances the PXI-4462 with pre-built functions for octave band analysis, sound pressure level (SPL) calculations, and modal analysis—critical for structural and acoustic testing.

NI BNC-2145: A terminal block with 8 BNC connectors, designed to simplify connections between IEPE sensors/voltage sources and the PXI-4462. It includes status LEDs for excitation and signal presence, easing system validation.

Installation, Commissioning, and Maintenance

Installation Steps

Module Insertion: Power off the PXI chassis (e.g., PXI-1031). Insert the PXI-4462 into an available slot, ensuring full seating in the backplane. Secure with front-panel screws to prevent movement during operation.

Sensor Connection: Use the BNC-2145 terminal block to connect up to 8 IEPE sensors or voltage sources. For IEPE sensors, enable 4 mA excitation per channel via software. Use shielded cables for low-level signals (e.g., microphones) to minimize noise.

Software Setup: Install NI-DAQmx drivers and the Sound and Vibration Toolkit on the PXI controller. Launch NI Measurement & Automation Explorer (MAX) to verify module detection and configure channel settings (range, excitation, coupling).

Commissioning

Calibration Verification: Inject a calibrated 1 kHz sine wave (1 Vrms) into each channel and verify measurements match within specified tolerances. Test frequency response across 0–80 kHz using a signal generator.

Synchronization Check: Connect a common signal to all 8 channels and confirm time stamps are aligned using NI-DAQmx tools. This ensures phase relationships are preserved for multi-channel analysis.

IEPE Functionality Test: Connect an IEPE accelerometer to one channel, apply a known vibration (e.g., 1 g at 100 Hz), and verify the module captures amplitude and frequency accurately. Repeat for a subset of channels to confirm consistency.

Maintenance Tips

Annual Calibration: Use NI’s accredited calibration services to maintain measurement accuracy, critical for compliance with standards like ISO 17025 (testing laboratories) or ISO 10844 (acoustic testing).

Connector Care: Clean BNC connectors with isopropyl alcohol quarterly to prevent corrosion, which can introduce noise. Inspect cables for damage, replacing those with frayed shielding or loose connectors.

Power Management: Ensure the PXI chassis provides sufficient power (the PXI-4462 draws ~10 W). Avoid overloading the chassis with high-power modules, which can cause voltage fluctuations.

Software Updates: Keep NI-DAQmx drivers updated to access performance improvements and new features. NI’s website provides compatibility matrices for software and hardware versions.

Service and Guarantee Commitment

The NI PXI-4462 comes with a 2-year standard warranty covering defects in materials and workmanship. National Instruments’ global technical support team offers 24/7 assistance for installation, troubleshooting, and software integration via phone, email, and online resources.

NI provides NIST-traceable calibration services to ensure the module meets published specifications. Extended warranty and calibration plans are available for customers requiring long-term support. Engineered for reliability, the PXI-4462 delivers consistent performance in demanding multi-channel dynamic signal applications, backed by NI’s commitment to quality and customer success.