描述
产品概述
NI PXI-6255是美国国家仪器（National Instruments）推出的PXI总线多功能I/O设备，属于M系列高速数据采集模块。其设计兼顾高密度通道、多信号处理能力及同步性能，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
模拟输入（AI）
-通道配置：80单端或40差分通道，支持高密度信号接入；
-分辨率与采样率：16位，单通道最大1.25 MS/s，扫描模式下750 kS/s；
-输入范围：±11 V（最大工作电压，测量类别I）。
模拟输出（AO）
-通道与性能：2路16位输出，支持高动态信号生成（最大速率2.8 MS/s）。
数字I/O（DIO）
-通道数：24条双向数字线，支持关联时钟（8条差分时钟线，频率10 MHz）；
-触发功能：支持边沿触发与脉冲宽度测量。
计数器/定时器
-资源：2个24位独立计数器，最大频率80 MHz；
-功能：脉冲序列生成、频率测量、编码器接口及栅极脉冲计数。
同步与触发机制
-触发类型：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，实现多设备协同。
信号调理与校准
-兼容平台：支持NI SCC与SCXI信号调理系统，提供放大、滤波及IEEE 1451.4智能传感器接口；
-校准技术：内置NIST可追溯校准证书，确保测量精度。
物理接口与扩展性
-连接器：2个68针VHDCI接口，支持高密度信号接入；
-环境适应性：工作温度0-55°C，湿度10%-90%RH（非冷凝）。
技术优势
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；
动态性能：NI-STC 2系统控制器与NI-PGIA 2放大器优化高速扫描下的信号稳定性，保持16位精度；
软件生态：兼容NI-DAQmx驱动及LabVIEW SignalExpress，支持快速原型开发与自动化测试。
Product Overview
NI PXI-6255 is a PXI bus multi-function I/O device launched by National Instruments,and belongs to the M series high-speed data acquisition module.Its design takes into account high-density channels,multi-signal processing capabilities and synchronization performance,and is suitable for industrial automation,precision testing and complex control scenarios.
Core parameters and functions
Analog input(AI)
-Channel configuration:80 single-ended or 40 differential channels,supporting high-density signal access;
-Resolution and sampling rate:16-bit,maximum single channel of 1.25 MS/s,750 kS/s in scanning mode;
-Input range:±11 V(maximum operating voltage,measurement category I).
Analog output(AO)
-Channel and performance:2 16-bit outputs,supporting high dynamic signal generation(maximum rate 2.8 MS/s).
Digital I/O(DIO)
-Number of channels:24 bidirectional digital lines,supporting associated clocks(8 differential clock lines,frequency 10 MHz);
-Trigger function:Support edge triggering and pulse width measurement.
Counter/Timer
-Resources:2 24-bit independent counters,maximum frequency of 80 MHz;
-Functions:pulse sequence generation,frequency measurement,encoder interface and gate pulse counting.
Synchronization and triggering mechanisms
-Trigger type:analog edge/window trigger,digital edge trigger,support external digital trigger(optional polarity);
-Synchronous bus:compatible with PXI RTSI trigger mechanism to realize multi-device collaboration.
Signal conditioning and calibration
-Compatible platform:supports NI SCC and SCXI signal conditioning systems,providing amplification,filtering and IEEE 1451.4 intelligent sensor interface;
-Calibration technology:Built-in NIST traceable calibration certificate to ensure measurement accuracy.
Physical interface and scalability
-Connector:2 68-pin VHDCI interfaces,supporting high-density signal access;
-Environmental adaptability:Operating temperature 0-55°C,humidity 10%-90%RH(non-condensing).
Technical Advantages
High integration:single-device integrates analog,digital and counter functions to reduce system complexity;
Dynamic performance:NI-STC 2 system controller and NI-PGIA 2 amplifier optimize signal stability under high-speed scanning to maintain 16-bit accuracy;
Software ecosystem:Compatible with NI-DAQmx driver and LabVIEW SignalExpress,supporting rapid prototyping and automated testing.
