描述
产品概述
NI PXI-6254是美国国家仪器（National Instruments）推出的PXI总线多功能数据采集（DAQ）模块，属于M系列高精度产品线。其设计兼顾高速采样与多信号处理能力，适用于工业自动化、精密测试及复杂控制场景。
核心参数与功能
信号采集能力
-模拟输入：
-通道配置：32单端或16差分通道（最大输入电压±11V）；
-分辨率与采样率：16位，单通道最大1.25 MS/s，多通道平均1 MS/s。
-模拟输出：2路16位输出，支持高动态信号生成。
数字I/O与计数器
-数字通道：48路双向DIO，支持关联时钟（32条差分时钟线，频率10 MHz）；
-计数器/定时器：2个32位独立计数器，最大频率80 MHz，支持脉冲生成、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（可选极性）；
-同步总线：兼容PXI RTSI触发机制，实现多机箱协同。
环境与扩展性
-物理接口：2个68针VHDCI连接器，支持高密度信号接入；
-兼容性：适配PXI混合总线架构，支持Linux、Windows及实时操作系统。
精度与校准
-定时精度：采样率误差≤50 ppm；
-校准认证：内置NIST可追溯校准证书，70+种信号调理选项提升测量可靠性。
技术优势
高密度集成：单槽位设计整合模拟、数字及计数器功能，节省机架空间；
动态性能：NI-MCal调谐技术优化信号调理路径，确保全速运行时16位分辨率精度；
软件生态：兼容NI-DAQmx驱动及LabVIEW开发平台，支持快速原型开发。
典型应用场景
工业控制：多轴运动控制中的位置反馈与脉冲分配；
电子测试：高频信号采集（如开关电源纹波分析）；
科研实验：需高同步精度的分布式传感器网络构建。
Product Overview
NI PXI-6254 is a PXI bus multifunctional data acquisition(DAQ)module launched by National Instruments,and belongs to the M series high-precision product line.Its design takes into account high-speed sampling and multi-signal processing capabilities,and is suitable for industrial automation,precision testing and complex control scenarios.
Core parameters and functions
Signal acquisition capability
-Analog input:
-Channel configuration:32 single-ended or 16 differential channels(maximum input voltage±11V);
-Resolution and sampling rate:16 bits,maximum single channel 1.25 MS/s,average multi-channel 1 MS/s.
-Analog output:2 16-bit outputs,supporting high dynamic signal generation.
Digital I/O and Counter
-Digital channel:48-channel bidirectional DIO,supporting associated clocks(32 differential clock lines,frequency 10 MHz);
-Counter/Timer:2 32-bit independent counters,maximum frequency of 80 MHz,supports pulse generation,frequency measurement and encoder interface.
Synchronization and Triggering
-Trigger mode:analog edge/window trigger,digital edge trigger,support external digital trigger(optional polarity);
-Synchronous bus:compatible with PXI RTSI trigger mechanism to realize multi-chassis collaboration.
Environment and scalability
-Physical interface:2 68-pin VHDCI connectors,supporting high-density signal access;
-Compatibility:Adapt to PXI hybrid bus architecture,supports Linux,Windows and real-time operating systems.
Accuracy and calibration
-Timing accuracy:sampling rate error≤50 ppm;
-Calibration certification:Built-in NIST traceable calibration certificate,70+signal conditioning options improve measurement reliability.
Technical Advantages
High-density integration:single-slot design integrates analog,digital and counter functions to save rack space;
Dynamic performance:NI-MCal tuning technology optimizes signal conditioning paths to ensure 16-bit resolution accuracy when running at full speed;
Software ecosystem:Compatible with NI-DAQmx driver and LabVIEW development platform,supporting rapid prototype development.
Typical application scenarios
Industrial control:position feedback and pulse distribution in multi-axis motion control;
Electronic testing:high-frequency signal acquisition(such as switching power supply ripple analysis);
Scientific research experiments:Construction of distributed sensor networks with high synchronization accuracy is required.
