Product Short Description
Product Name
C Series Sound and Vibration Input Module
Product Introduction
The NI 9234 is a 4-channel sound and vibration analog input module from National Instruments, optimized for IEPE sensor measurement. It delivers 24-bit resolution and 51.2 kS/s per channel simultaneous sampling, ideal for vibration monitoring, acoustic testing, and condition monitoring applications.
Description
Technical Specifications
- Number of Channels: 4 differential analog input channels
- ADC Resolution: 24 bits
- Maximum Sampling Rate: 51.2 kS/s per channel (simultaneous)
- Input Voltage Range: ±5 V
- IEPE Excitation: Software-selectable 0 mA or 2 mA
- Coupling: Software-selectable AC/DC coupling
- Input Impedance: 1 MΩ
- Connector Type: BNC
- Operating Temperature: -40°C to 70°C
- TEDS Support: IEEE 1451.4 TEDS Class I
Functional Features
- Built-in anti-aliasing filters automatically adjust to sample rate
- Software-configurable IEPE excitation and coupling
- Simultaneous sampling for phase-accurate vibration measurement
- Compatible with piezoelectric accelerometers, microphones, and proximity probes
- Integrated TEDS sensor identification for automatic sensor configuration
Application Scenarios
- Rotating machinery vibration monitoring and analysis
- Acoustic noise measurement and sound quality testing
- Structural dynamics and modal analysis
- Bearing fault detection and condition monitoring
- Automotive NVH (Noise, Vibration, Harshness) testing
Structural Characteristics
- BNC connector interface for standard sensor cables
- Rugged industrial housing with conformal coating option
- Compact C Series form factor for portable and embedded systems
- Shielded internal design for low noise measurement
- Channel status indicators for operational diagnostics
Working Principle
The module accepts input signals from IEPE or passive sensors, provides configurable IEPE excitation current, and conditions the analog signals through precision amplification and filtering. A 24-bit delta-sigma ADC converts the analog signals to digital data at simultaneous sampling rates. The digital data is transferred to the DAQ system for time and frequency domain analysis.
Installation Requirements
- Install into any C Series slot in CompactDAQ or CompactRIO chassis
- Use 50 Ω coaxial BNC cables for sensor connection
- Ensure sensor cables are properly shielded and grounded
- Avoid routing sensor cables near high-power electrical equipment
- Allow sufficient clearance for cable bending
Usage Notes
- Enable IEPE excitation only when using IEPE-type sensors
- Set coupling mode according to measurement requirements
- Calibrate the measurement chain periodically with reference standards
- Avoid excessive input voltage beyond ±30 V overvoltage protection limit
- Use TEDS-enabled sensors for simplified system configuration
Reviews
There are no reviews yet.