The NI PXIe-4492 is a high-performance PXI Express module for sound and vibration data acquisition. It delivers eight simultaneously sampled analog input channels with 24-bit resolution, sampling rates up to 204.8 kS/s per channel, and 114 dB dynamic range. The module integrates IEPE signal conditioning, built-in antialiasing filters, and TEDS smart sensor support for precision measurements in NVH analysis, microphone arrays, and structural testing.
Technical Specifications
-# Analog Input Performance
• 8 simultaneous analog input channels, 24-bit resolution
• Sampling rate: up to 204.8 kS/s per channel
• Dynamic range: 114 dB (unweighted, 1 kHz input tone, -60 dBFS)
• Input coupling: software-selectable AC or DC
• Gain settings: +20 dB maximum, supporting ±1 V to ±10 V input ranges
-# Signal Conditioning
• IEPE current excitation: software-selectable at 0 or 4 mA per channel
• Per-channel IEPE sensor open and short detection
• High-pass filter cutoff: 0.5 Hz
• Antialiasing filters: built-in, automatically adjusting to sampling rate
• Digital and analog low-pass filters for Nyquist bandwidth screening
-# Timing and Synchronization
• Onboard PLL circuitry locks 100 MHz VCXO to PXI/PXIe 10 MHz reference clock
• Multiple triggering modes including external digital triggering
• PFI digital trigger input interface
-# Connectors and Cabling
• 4X InfiniBand connectors for analog I/O with shielded signal pair separation
• Shielded breakout cable with 8 BNC connectors
• 19 in. rack-mount adapter with 32 BNC connectors (supports up to four PXIe-4492 modules)
-# Power Requirements
• +3.3 V @ 2000 mA
• +12 V @ 400 mA
– Key Features
• TEDS support for transducer electronic data sheet integration
• Configurable AC/DC coupling for flexible source adaptation
• Integrated sensor diagnostics with open/short detection
• Synchronized acquisition across all eight channels
– Typical Applications
• Noise, vibration, and harshness (NVH) analysis
• Large microphone array measurements
• Dynamic structural testing and modal analysis
– Compatibility & Integration
Designed for PXI Express systems, the PXIe-4492 leverages the platform’s architecture for high-speed, synchronized data acquisition across multiple modules.
