描述
产品概述
PXI-4461是美国国家仪器（NI）推出的高精度声音与振动数据采集模块，专为动态信号采集与生成设计。其集成24位分辨率模数转换器、软件可配置的AC/DC耦合及IEPE传感器调理功能，适用于音频测试、机械振动分析及工业监测等场景。
核心参数与功能
信号采集与生成能力
-模拟输入：
-通道数：2或4通道（差分/伪差分可选）；
-输入范围：±316 mV至±42.4 V（6种增益设置）；
-最大采样率：204.8 kS/s（单通道）；
-动态范围：118 dB（典型值）。
-模拟输出：
-通道数：2通道（同步更新）；
-输出范围：±10 V。
信号调理与处理
-抗混叠滤波：硬件级抗混叠滤波器（截止频率可配）；
-耦合模式：软件可切换AC/DC耦合；
-传感器支持：
-内置IEPE激励（兼容压电式加速度计、麦克风）；
-支持高动态范围传感器（如声学传感器）。
同步与扩展性
-多模块同步：通过PXI星触发（Star Trigger）实现多设备同步；
-接口兼容性：
-PXI总线供电；
-支持与NI PXIe-6363等模块构建混合系统。
技术特点
高精度与低噪声：
-24位分辨率模数转换器（ADC），噪声基底<1µV（典型值）；
-板载数字滤波器抑制带外干扰。
灵活配置：
-伪差分输入模式（通过BNC外壳接地优化共模抑制）；
-通道独立设置增益与耦合模式。
软件生态：
-兼容LabVIEW、TestStand及NI-DAQmx驱动；
-支持Python、MATLAB等第三方开发环境。
典型应用场景
工业测试与监测
-汽车NVH（噪声、振动与声振粗糙度）分析；
-机器状态监测（MCM）与预测性维护。
声学研究
-音频设备测试（如扬声器频率响应分析）；
-水声信号采集（结合LabVIEW开发水下探测系统）。
科研实验
-结构动力学测试（多点振动同步采集）；
-声学传感器校准（高动态范围支持）。
Product Overview
PXI-4461 is a high-precision sound and vibration data acquisition module launched by National Instruments(NI),designed for dynamic signal acquisition and generation.It integrates 24-bit resolution analog-to-digital converter,software-configurable AC/DC coupling and IEPE sensor conditioning functions,and is suitable for audio testing,mechanical vibration analysis and industrial monitoring scenarios.
Core parameters and functions
Signal acquisition and generation capabilities
-Analog input:
-Number of channels:2 or 4 channels(differential/pseudo-differential optional);
-Input range:±316 mV to±42.4 V(6 gain settings);
-Maximum sampling rate:204.8 kS/s(single channel);
-Dynamic range:118 dB(typical).
-Analog output:
-Number of channels:2 channels(simultaneous update);
-Output range:±10 V.
Signal conditioning and processing
-Anti-aliasing filter:hardware-level anti-aliasing filter(cutoff frequency can be matched);
-Coupling mode:software switchable AC/DC coupling;
-Sensor support:
-Built-in IEPE excitation(compatible with piezoelectric accelerometers and microphones);
-Supports high dynamic range sensors(such as acoustic sensors).
Synchronization and scalability
-Multi-module synchronization:Multi-device synchronization is achieved through PXI star trigger;
-Interface compatibility:
-PXI bus power supply;
-Supports the construction of hybrid systems with modules such as NI PXIe-6363.
Technical Features
High precision and low noise:
-24-bit resolution analog-to-digital converter(ADC),noise base<1µV(typical);
-Onboard digital filter suppresses out-of-band interference.
Flexible configuration:
-Pseudo-differential input mode(optimized common mode rejection through BNC shell grounding);
-Channels independently set gain and coupling modes.
Software Ecology:
-Compatible with LabVIEW,TestStand and NI-DAQmx drivers;
-Supports third-party development environments such as Python and MATLAB.
Typical application scenarios
Industrial testing and monitoring
-Automotive NVH(noise,vibration and sound and vibration roughness)analysis;
-Machine status monitoring(MCM)and predictive maintenance.
Acoustic Research
-Audio equipment testing(such as speaker frequency response analysis);
-Water acoustic signal acquisition(development of underwater detection system in conjunction with LabVIEW).
Scientific research experiments
-Structural dynamics test(simultaneous acquisition of multi-point vibration);
-Acoustic sensor calibration(high dynamic range support).
