描述
产品概述
NI 6221是美国国家仪器（National Instruments）推出的M系列多功能数据采集（DAQ）卡，支持PCI总线，适用于工业自动化、实验室研究及嵌入式测量场景。其高密度通道与多信号处理能力，使其成为复杂数据采集任务的理想选择。
核心参数与功能
模拟输入（AI）
-通道配置：8差分或16单端通道，最大输入电压±11 V（信号+共模）；
-分辨率与采样率：16位，单通道最大250 kS/s，多通道聚合250 kS/s；
-精度指标：
-CMRR（DC至60 Hz）：92 dB；
-输入阻抗：10 GΩ||100 pF（设备开启时）；
-过压保护：±25 V（设备开启时，每通道）。
模拟输出（AO）
-通道与性能：2路16位输出，最大更新速率833 kS/s；
-动态特性：支持高精度波形生成（如正弦波、脉冲信号）。
数字I/O（DIO）
-通道数：10路双向数字线，支持关联时钟（8条差分时钟线，频率1 MHz）；
-触发功能：边沿触发与脉冲宽度测量。
计数器/定时器
-资源：2个32位独立计数器，最大频率80 MHz；
以下功能：脉冲序列生成、频率测量及编码器接口。
同步与触发
-触发模式：模拟边沿/窗口触发、数字边沿触发，支持外部数字触发器；
-定时精度：采样率误差≤50 ppm，时序分辨率50 ns。
功能特点
高集成度：单设备整合模拟、数字及计数器功能，减少系统复杂度；
校准认证：NIST可追溯校准证书，支持长期稳定性（建议每1-2年校准）；
软件生态：
-兼容NI-DAQmx驱动及LabVIEW开发平台；
-支持Measurement&Automation Explorer（MAX）配置工具。
典型应用场景
工业控制：多传感器信号采集与实时反馈（如生产线监控）；
科研实验：动态信号分析（如振动测试、声学研究）；
自动化测试：高精度计数与定时控制（如电机转速测量）。
Product Overview
NI 6221 is an M series multifunctional data acquisition(DAQ)card launched by National Instruments.It supports PCI bus and is suitable for industrial automation,laboratory research and embedded measurement scenarios.Its high-density channels and multi-signal processing capabilities make it an ideal choice for complex data acquisition tasks.
Core parameters and functions
Analog input(AI)
-Channel configuration:8 differential or 16 single-ended channels,maximum input voltage±11 V(signal+common mode);
-Resolution and sampling rate:16-bit,maximum single channel 250 kS/s,multi-channel aggregation 250 kS/s;
-Accuracy indicators:
-CMRR(DC to 60 Hz):92 dB;
-Input impedance:10 GΩ||100 pF(When the device is turned on);
-Overvoltage protection:±25 V(per channel when the device is turned on).
Analog output(AO)
-Channels and performance:2 channels 16-bit outputs,maximum update rate of 833 kS/s;
-Dynamic features:Support high-precision waveform generation(such as sine waves,pulse signals).
Digital I/O(DIO)
-Number of channels:10 bidirectional digital lines,supporting associated clocks(8 differential clock lines,frequency 1 MHz);
-Trigger function:edge trigger and pulse width measurement.
Counter/Timer
-Resources:2 32-bit independent counters,maximum frequency of 80 MHz;
The following functions:pulse sequence generation,frequency measurement and encoder interface.
Synchronization and Triggering
-Trigger mode:simulate edge/window trigger,digital edge trigger,support external digital trigger;
-Timing accuracy:sampling rate error≤50 ppm,timing resolution 50 ns.
Functional Features
High integration:single-device integrates analog,digital and counter functions to reduce system complexity;
Calibration certification:NIST traceable calibration certificate supports long-term stability(calibration is recommended every 1-2 years);
Software Ecology:
-Compatible with NI-DAQmx driver and LabVIEW development platform;
-Supports Measurement&Automation Explorer(MAX)configuration tools.
Typical application scenarios
Industrial control:multi-sensor signal acquisition and real-time feedback(such as production line monitoring);
Scientific research experiments:dynamic signal analysis(such as vibration testing,acoustic research);
Automated testing:high-precision counting and timing control(such as motor speed measurement).
