Product Overview
The National Instruments USB-4431 is a sound and vibration device for USB based measurement systems. It is designed for acoustic, vibration, and dynamic signal acquisition applications that require high resolution and low noise. The device provides 24 bit analog input, a plus or minus 10 V input range, and a maximum sampling rate of 102.4 kS/s.
The USB-4431 is part of the NI dynamic signal acquisition family. It connects to a laptop or desktop computer through USB and is supported by NI-DAQmx software. The device is suitable for laboratory research, product validation, noise measurement, vibration testing, and educational experiments in acoustics and mechanics.
Analog Input and Resolution
The USB-4431 provides high resolution analog input channels for dynamic signals. The 24 bit resolution supports measurement of small signals in the presence of larger background noise. The plus or minus 10 V input range covers common sensor outputs and signal levels used in sound and vibration testing. The device includes anti alias filtering and low noise input circuitry to preserve signal quality.
The maximum sampling rate of 102.4 kS/s supports time domain capture and frequency domain analysis. Engineers can use the device to record waveforms for fast Fourier transform, octave analysis, order analysis, and modal analysis. The USB-4431 is designed to work with sensors such as accelerometers, microphones, and other dynamic transducers within its input specifications.
Sound and Vibration Measurement
Sound and vibration measurements often require low noise, stable clocking, and synchronized channels. The USB-4431 provides a USB based platform for these measurements with software configurable sampling and triggering. It can be used with IEPE sensors when the system includes appropriate signal conditioning or when used with compatible input settings.
The device is suitable for acoustic measurements in chambers, vibration testing on shakers, and structural response testing. Proper sensor mounting, cabling, and grounding are important for accurate results. The USB-4431 can be used with NI software for data logging, spectral analysis, and report generation.
Software and USB Integration
The USB-4431 is supported by NI-DAQmx driver software. It can be programmed with LabVIEW, LabWindows/CVI, Measurement Studio, and other NI-DAQmx compatible development environments. Engineers can configure input ranges, sampling rates, triggering, and channel settings through standard software tools.
The USB interface makes the device convenient for bench top and portable measurement setups. It can be connected directly to a computer without a PXI or CompactDAQ chassis. This reduces system size and simplifies setup for acoustic and vibration tests. The device can also be synchronized with other NI hardware where supported by the software and system configuration.
Typical Applications
Acoustic measurement and sound quality test
Vibration measurement and modal analysis
Structural dynamic response testing
Product noise and vibration validation
Laboratory research in acoustics and mechanics
Portable dynamic signal acquisition
The USB-4431 provides 24 bit sound and vibration measurement with plus or minus 10 V input range and 102.4 kS/s sampling. Its USB form factor and NI-DAQmx support make it suitable for laboratory, bench top, and portable dynamic signal applications.
