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NI 9234

Product Name
NI-9234 C Series Sound and Vibration Input Module.
Product Introduction
4-channel, 24-bit IEPE-capable analog input module for acoustic, accelerometer, and vibration measurement.
Category:
Description
Technical Specifications
Brand: National Instruments
Model: NI-9234
Channels: 4 analog input
Resolution: 24 bits
ADC Type: Delta-sigma with analog prefiltering
Sample Rate: 51.2 kS/s per channel
Input Range: ±5 V
Input Coupling: AC/DC software-selectable
IEPE Excitation: 2.0 mA min, 2.1 mA typical
Compliance Voltage: 19 V max
Differential Impedance: 305 kΩ
Overvoltage Protection: ±30 V
Performance Parameters
Internal Timebase: 13.1072 MHz
Accuracy Drift Gain: 16 ppm/°C typical
Offset Drift: 19.2 µV/°C typical
Crosstalk at 1 kHz: -110 dB
CMRR at ≤1 kHz: 40 dB min, 47 dB typical
SFDR at 1 kHz, -60 dBFS: 120 dB
Active Power: 900 mW max
Weight: 173 g
Functional Features
Simultaneous sampling.
IEPE sensor power supply.
Tachometer and proximity-probe support.
Anti-aliasing filter.
IEEE 1451.4TEDS Class I support.
BNC front-connector versions available.
Application Scenarios
Machine condition monitoring.
Vibration analysis.
Acoustic measurement.
Accelerometer data acquisition.
Rotating equipment diagnostics.
Laboratory sound and vibration testing.
Structural Characteristics
C Series module.
BNC or screw-terminal variants by part number.
Delta-sigma converter per channel group.
Compact rugged DAQ form factor.
Working Principle
Sensor signal enters AI+ and AI-.
IEPE sensors receive constant-current excitation.
Signal is filtered, digitized, and timestamped.
Controller analyzes frequency, amplitude, and waveform data.
Installation Requirements
Insert into CompactDAQ or CompactRIO chassis.
Keep BNC shells from touching each other.
Use shielded sensor cables.
Match IEPE enable setting to sensor type.
Usage Notes
Do not exceed ±5 V input range.
Enable IEPE only for compatible sensors.
Calibrate annually for precision work.
Avoid ground loops in multi-sensor setups.
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