Product Short Description
Product Name
PXI-4472B 8-Channel 24-Bit Dynamic Signal Acquisition Module
Product Overview
The PXI-4472B is a high-resolution dynamic signal acquisition module designed for sound, vibration, and acoustic measurement. It uses delta-sigma ADC technology and integrated IEPE signal conditioning for accelerometers and microphones.
Description
Technical Specifications
- Analog Input Channels: 8 simultaneously sampled
- ADC Resolution: 24 bits
- ADC Type: Delta-sigma
- Sample Rate: 1 kS/s to 102.4 kS/s
- Input Signal Range: ±10 V peak
- Input Coupling: Software-selectable AC or DC
- Dynamic Range: 110 dB typical
- FIFO Buffer: 1,023 samples
- Data Transfer: DMA
- Frequency Accuracy: ±25 ppm
- Operating Temperature: 0 °C to 55 °C
- Warm-up Time: 15 minutes
Functional Features
- Integrated IEPE excitation for piezoelectric sensors
- AC/DC software-selectable coupling
- Anti-aliasing and delta-sigma filtering
- Simultaneous sampling across all channels
- RTSI and PXI trigger bus synchronization
Working Principle
Input signals pass through pseudodifferential conditioning and delta-sigma modulation. The converter oversamples the analog signal, digitally filters it, and produces high-resolution time-domain and frequency-domain data for sound and vibration analysis.
Application Scenarios
- Noise, vibration, harshness (NVH) testing
- Machine condition monitoring
- Structural dynamics
- Acoustic analysis
- Automotive and aerospace vibration test
- Modal and frequency response analysis
Installation Requirements
- Install in standard PXI chassis slot
- Use shielded sensor cables
- Connect IEPE sensors or external signal-conditioning hardware as required
- Install NI-DAQmx and Sound and Vibration Toolkit when needed
- Keep filler panels in unused slots
Usage Notes
- Inputs are sensitive to electromagnetic interference
- Allow 15-minute warm-up for rated accuracy
- Shield cables in noisy environments
- Do not apply voltages beyond overvoltage protection limits
- Perform periodic calibration according to NI recommendations
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