描述
NI 9221产品详情
产品概述
NI 9221是National Instruments（NI）推出的一款高精度、多通道模拟输入模块，属于CompactDAQ（cDAQ）或CompactRIO（cRIO）系列。它专为数据采集（DAQ）应用设计，支持同步采集多路电压信号，适用于工业自动化、结构健康监测、科研测试等场景。该模块通过NI-DAQmx驱动与LabVIEW、LabWindows/CVI等软件无缝集成，提供灵活的配置和高效的信号处理能力。
核心功能
多通道同步采集
提供16路单端或8路差分模拟输入通道，支持通道间同步采样，确保多传感器数据的时间一致性。
每通道独立配置增益和耦合方式（直流/交流），适应不同信号类型。
高精度测量
分辨率：16位（65,536计数），可检测微小信号变化。
采样率：单通道最高50 kS/s（每秒千采样），多通道时采样率均分（如16通道时约3.125 kS/s/通道）。
绝对精度：±0.02%读数（典型值），满足高精度测试需求。
灵活的信号输入范围
支持±10 V、±5 V、±1 V、±0.5 V四档量程，通过软件自动切换。
输入阻抗：≥1 GΩ（差分模式），减少对被测电路的影响。
触发与同步功能
提供数字触发输入（TTL电平），支持外部事件触发采样。
可与其他NI模块（如数字I/O、计数器模块）同步，实现多系统协同工作。
坚固耐用的设计
工业级温度范围：-40°C至70°C（扩展温度型号），适应恶劣环境。
抗冲击振动：符合MIL-STD-202G标准，适合车载或野外应用。
技术规格
参数规格
通道数16路单端/8路差分
分辨率16位
最大采样率50 kS/s（单通道），多通道时均分
输入范围±10 V、±5 V、±1 V、±0.5 V（软件可配置）
输入耦合直流（DC）或交流（AC，需外部耦合电容）
绝对精度±0.02%读数（典型值，25°C）
触发方式外部数字触发（上升沿/下降沿可配置）
连接方式50针D-SUB连接器（兼容NI cDAQ/cRIO机箱）
电源需求由cDAQ/cRIO机箱供电（无需外部电源）
尺寸紧凑型设计（符合cDAQ/cRIO模块标准尺寸）
软件支持NI-DAQmx驱动，兼容LabVIEW、C/C++、Python等
应用场景
工业自动化测试
采集传感器信号（如温度、压力、振动），用于设备状态监测和故障诊断。
结构健康监测
同步采集应变片、加速度计数据，分析桥梁、建筑等结构的动态响应。
科研与教育
实验室信号采集，如生物电信号（EEG/ECG）、光信号、声学信号分析。
能源管理
监测电网电压、电流波形，分析电能质量（如谐波、闪变）。
NI 9221 Product Details
Product Overview
NI 9221 is a high-precision,multi-channel analog input module launched by National Instruments(NI),belonging to the CompactDAQ(cDAQ)or CompactRIO(cRIO)series.It is designed for data acquisition(DAQ)applications and supports the synchronous acquisition of multiple voltage signals.It is suitable for scenarios such as industrial automation,structural health monitoring,and scientific research testing.The module is seamlessly integrated with software such as LabVIEW and LabWindows/CVI through the NI-DAQmx driver,providing flexible configuration and efficient signal processing capabilities.
Core Functions
Multi-channel Synchronous Acquisition
Provides 16 single-ended or 8 differential analog input channels,supports synchronous sampling between channels,and ensures the time consistency of multi-sensor data.
Each channel independently configures gain and coupling mode(DC/AC)to adapt to different signal types.
High-precision measurement
Resolution:16 bits(65,536 counts),which can detect small signal changes.
Sampling rate:up to 50 kS/s(thousand samples per second)for a single channel,and the sampling rate is evenly divided for multiple channels(e.g.,about 3.125 kS/s/channel for 16 channels).
Absolute accuracy:±0.02%reading(typical value),meeting high-precision test requirements.
Flexible signal input range
Supports four ranges of±10 V,±5 V,±1 V,and±0.5 V,which are automatically switched by software.
Input impedance:≥1 GΩ(differential mode)to reduce the impact on the circuit under test.
Trigger and synchronization function
Provides digital trigger input(TTL level)to support external event trigger sampling.
Can be synchronized with other NI modules(such as digital I/O,counter modules)to achieve multi-system collaboration.
Rugged design
Industrial temperature range:-40°C to 70°C(extended temperature model),adaptable to harsh environments.
Shock and vibration resistance:Meets MIL-STD-202G standards,suitable for vehicle-mounted or field applications.
Technical Specifications
Parameter Specifications
Number of channels 16 single-ended/8 differential
Resolution 16 bits
Maximum sampling rate 50 kS/s(single channel),time-averaged for multiple channels
Input range±10 V,±5 V,±1 V,±0.5 V(software configurable)
Input coupling DC or AC,external coupling capacitor required
Absolute accuracy±0.02%reading(typical,25°C)
Trigger mode External digital trigger(rising edge/falling edge configurable)
Connection method 50-pin D-SUB connector(compatible with NI cDAQ/cRIO chassis)
Power requirements Powered by cDAQ/cRIO chassis(no external power supply required)
Dimensions Compact design(conforms to the standard size of cDAQ/cRIO modules)
Software support NI-DAQmx driver,compatible with LabVIEW,C/C++,Python etc.
Application scenarios
Industrial automation testing
Collect sensor signals(such as temperature,pressure,vibration)for equipment status monitoring and fault diagnosis.
Structural health monitoring
Synchronously collect strain gauge and accelerometer data to analyze the dynamic response of structures such as bridges and buildings.
Scientific research and education
Laboratory signal acquisition,such as bioelectric signals(EEG/ECG),optical signals,and acoustic signal analysis.
Energy management
Monitor grid voltage and current waveforms and analyze power quality(such as harmonics and flicker).
