The NI PXI-4472B is an 8-channel, 24-bit dynamic signal acquisition module purpose-built for vibration and acoustic measurements. It delivers simultaneous sampling at up to 102.4 kS/s per channel with integrated IEPE conditioning for accelerometers and microphones. The module combines a 45 kHz alias-free bandwidth, greater than 110 dB dynamic range, and software-configurable AC/DC coupling to support demanding frequency domain analysis across machine condition monitoring and NVH testing workflows.
Technical Specifications
Analog Inputs
• 8 channels, 24-bit ADC resolution
• Sampling rate: 102.4 kS/s maximum per channel, simultaneous across all channels
• Alias-free bandwidth: 45 kHz
• Dynamic range: Greater than 110 dB
• Input voltage range: ±10 V
• AC coupling cutoff frequency: 0.5 Hz
• Input coupling: Software-configurable AC/DC
• Integrated IEPE signal conditioning for direct accelerometer and microphone connection
• Built-in antialiasing filters with automatic rate-dependent adjustment
• Delta-sigma modulating ADCs for low noise and distortion
Power Consumption
• +3.3 VDC: 400 mA maximum
• +5 VDC: 2000 mA maximum
• +12 VDC: 120 mA maximum
• −12 VDC: 120 mA maximum
Triggering
• Pretrigger and posttrigger modes
• Trigger sources: analog input channels, external digital input, PXI trigger bus, RTSI bus, software
• Analog triggering: window, edge, and edge with hysteresis modes
Interface & Data Transfer
• PCI mini-MITE DMA bus-master interface
• Data transfer: 20–30 MB/s full DMA, up to 132 MB/s burst
• Multi-device synchronization via PXI star trigger or RTSI bus
Physical & Environmental
• Dimensions: 6.3 × 3.9 inches
• Weight: 8.5 oz
• Operating temperature: 0 to 55 °C
• Storage temperature: −20 to 70 °C
• Recommended conditions: 18–28 °C, relative humidity below 80%
– Key Features
• Simultaneous 8-channel acquisition eliminates cross-channel timing skew
• 24-bit resolution captures subtle vibration and acoustic signatures
• Integrated IEPE eliminates external signal conditioning for IEPE sensors
• Window and hysteresis triggering reduce false triggers in noisy environments
• Automatic antialiasing filter adjustment prevents data corruption across sample rates
– Typical Applications
• Machine condition monitoring and predictive maintenance
• NVH testing and analysis
• Structural health monitoring
• Acoustic emission detection
• Modal analysis and vibration characterization
– Compatibility & Integration
The module operates within the NI PXI platform and synchronizes with other NI 447x devices for extended channel counts. DMA-based data transfer to host memory supports continuous acquisition workflows. PXI trigger and RTSI buses enable timing coordination across multi-instrument test systems.
