NI PCI-4462 4-Input Sound and Vibration Device

Built-in 24-bit ADC (Analog-to-Digital Converter) with a dynamic range of 115dB and a base noise as low as 1.2μVrms, suitable for high-precision measurement of weak signals (e.g., acoustic emission, vibration acceleration).

Supports ±10V analog input range, directly connectable to IEPE (Integrated Electronics Piezoelectric) sensors, microphones, accelerometers, and other devices.

8-channel synchronous sampling with a maximum sampling rate of 102.4kS/s (single channel), supporting 12.8kS/s synchronous acquisition per channel in multi-channel mode to ensure signal timing consistency.

Each channel integrates a 5th-order low-pass anti-aliasing filter (cutoff frequency software-configurable up to 10kHz), effectively suppressing high-frequency noise and meeting Nyquist sampling theorem requirements.

Supports IEPE sensor power supply (±2mA constant current source), simplifying sensor wiring; 200Vrms electrical isolation between channels prevents ground loop interference, suitable for industrial high-power environments.

Built-in transient protection circuit withstands ±25V overload voltage, enhancing device reliability.

Supports analog triggering (edge/window triggering), digital triggering (TTL level), and external clock synchronization, adapting to multi-device collaborative testing scenarios (e.g., multi-card synchronous acquisition).

On-board 4MB FIFO buffer reduces data transmission delay and supports long-term continuous acquisition.

Automotive NVH (Noise, Vibration, and Harshness) analysis: Acquires engine/transmission vibration signals and in-vehicle noise to optimize acoustic design.

Structural health monitoring: Monitors modal vibrations of bridges and wind turbine towers via accelerometers to evaluate structural stability.

Microphone array calibration and sound field analysis: Collaborates with sound level meters to acquire audio signals for speaker frequency response testing and anechoic chamber performance evaluation.

Ultrasonic testing: Acquires echo signals from ultrasonic transducers for non-destructive testing (NDT) and material defect identification.

Motor fault diagnosis: Monitors bearing vibrations via IEPE accelerometers, analyzes spectral characteristics (e.g., rolling element fault frequencies) to warn of equipment wear in advance.

Hydraulic system condition monitoring: Acquires dynamic signals from pressure sensors to identify abnormal conditions like system leaks and cavitation.

Physics experiment data acquisition: Supports data recording for teaching and research papers in experiments such as acoustic wave interference and vibration modal analysis.

Biomedical signal monitoring: Low-noise characteristics suit acquisition of weak bioelectrical signals (e.g., EMG, EEG) with front-end amplifiers.

Front-end connection: Sensor signals (e.g., voltage from IEPE accelerometers) are input via BNC interfaces or SCB-68 terminal blocks, with IEPE sensors powered by onboard constant current sources.

Signal conditioning: High-frequency noise is filtered by anti-aliasing filters; IEPE signals are directly acquired without additional amplification.

Analog-to-digital conversion: 24-bit ADC converts analog signals to digital quantities, transmitted to the host via PCI bus.

Software control: Configures parameters using NI-DAQmx driver, develops data processing programs with LabVIEW, MATLAB, or C to implement FFT spectral analysis, time-domain waveform display, and data storage.

Hardware: Supports desktop or industrial control computers with PCI slots, compatible with other PCI modules (e.g., NI PCI-6259).

Software: Compatible with Windows (7/10), LabVIEW Real-Time, etc., supports secondary development via API interfaces.