描述
NI PXI-4461是一款专为声音与振动应用设计的高精度数据采集模块，具有双输入/双输出通道，适用于工业测试、科研和工程领域。以下是其核心功能与技术特点的综合解析：
一、产品概述
NI PXI-4461是基于PXI平台的动态信号采集（DSA）模块，支持同时采集和生成高精度声音与振动信号。其设计旨在满足音频测试、NVH（噪声、振动与声振粗糙度）分析、机器状态监测等复杂应用需求，提供高分辨率、低噪声和宽动态范围的测量能力。
二、核心参数
信号通道配置
双输入通道：24位模拟输入，支持差分或伪差分模式，输入范围±316 mV至±42.4 V，六种增益设置可调。
双输出通道：24位模拟输出，最高更新速率204.8 kS/s，支持正弦波、方波等波形生成。
性能指标
动态范围：118 dB（24位分辨率），确保宽幅信号的精确测量。
采样率：最高204.8 kS/s，支持92 kHz无混叠带宽。
抗混叠滤波：可变滤波器设计，避免信号失真。
传感器兼容性
支持IEPE调理功能，适用于麦克风、加速度计等高动态范围传感器。
支持AC/DC耦合配置，适应不同信号类型。
三、技术特点
多模块同步
通过PXI触发总线实现多模块同步，通道间相位失真小于0.1度，适用于大规模数据采集系统。
工业级设计
抗干扰能力强，支持恶劣环境下的稳定运行（工作温度-40℃至70℃）。
热插拔功能，方便系统维护。
灵活扩展
模块化接口设计，可与其他PXI设备集成，构建多功能测试系统。
四、典型应用领域
声音测试与音频分析
麦克风校准、音频设备性能评估、声场分布测量。
振动与结构健康监测
机械系统振动分析、桥梁/风力发电机健康诊断、汽车NVH测试。
机器状态监测
轴承/齿轮箱故障检测、旋转机械动态特性分析。
教育与科研
声学实验、振动理论验证、工程教学。
PXIE-8135
PNI800A
NI PXI-4461 is a high-precision data acquisition module designed for sound and vibration applications.It has dual input/dual output channels and is suitable for industrial testing,scientific research and engineering.The following is a comprehensive analysis of its core functions and technical features:
I.Product Overview
NI PXI-4461 is a dynamic signal acquisition(DSA)module based on the PXI platform that supports the simultaneous acquisition and generation of high-precision sound and vibration signals.It is designed to meet the needs of complex applications such as audio testing,NVH(noise,vibration and harshness)analysis,and machine condition monitoring,providing high-resolution,low-noise and wide dynamic range measurement capabilities.
II.Core Parameters
Signal Channel Configuration
Dual input channels:24-bit analog input,supports differential or pseudo-differential mode,input range±316 mV to±42.4 V,and six adjustable gain settings.
Dual output channels:24-bit analog output,maximum update rate 204.8 kS/s,supports waveform generation such as sine wave and square wave.
Performance indicators
Dynamic range:118 dB(24-bit resolution),ensuring accurate measurement of wide-band signals.
Sampling rate:up to 204.8 kS/s,supporting 92 kHz alias-free bandwidth.
Anti-aliasing filter:variable filter design to avoid signal distortion.
Sensor compatibility
Supports IEPE conditioning function,suitable for high dynamic range sensors such as microphones and accelerometers.
Supports AC/DC coupling configuration to adapt to different signal types.
III.Technical features
Multi-module synchronization
Multi-module synchronization is achieved through the PXI trigger bus,and the phase distortion between channels is less than 0.1 degree,which is suitable for large-scale data acquisition systems.
Industrial-grade design
Strong anti-interference ability,supports stable operation in harsh environments(operating temperature-40℃to 70℃).
Hot-swap function,convenient system maintenance.
Flexible expansion
Modular interface design,can be integrated with other PXI devices to build a multi-functional test system.
IV.Typical application areas
Sound test and audio analysis
Microphone calibration,audio equipment performance evaluation,sound field distribution measurement.
Vibration and structural health monitoring
Vibration analysis of mechanical systems,health diagnosis of bridges/wind turbines,and automotive NVH testing.
Machine condition monitoring
Bearing/gearbox fault detection,dynamic characteristics analysis of rotating machinery.
Education and scientific research
Acoustic experiments,vibration theory verification,and engineering teaching.
