描述
产品概述
NI PXI-6259是美国国家仪器（NI）推出的M系列多功能数据采集（DAQ）模块，专为PXI平台设计，适用于工业自动化、实验室测试及高精度测量场景。其核心功能包括模拟输入/输出（AI/AO）、数字I/O（DIO）、计数器/定时器，并支持同步触发与多任务协调，满足复杂DAQ需求。
核心参数与性能
模拟输入（AI）
-通道数：32单端或16差分通道；
-分辨率与采样率：16位，单通道最高速度1.25 MS/s，多通道聚合1 MS/s；
-输入范围：±100 mV至±10 V可编程增益调节。
模拟输出（AO）
-通道数：4路独立输出；
-分辨率与更新率：16位，单通道最高速度2.86 MS/s。
数字I/O（DIO）
-通道数：48路（32路高速可达10 MHz）；
-电平兼容性：5 V TTL/CMOS逻辑。
计数器/定时器
-数量与功能：2个32位计数器，支持正交编码器（X1/X2/X4模式）、PWM生成及频率测量。
技术特点
同步与触发
-AO与DO同步：通过AO定时引擎共享采样时钟，确保时序一致性（需先启动DO任务）；
-触发模式：支持模拟边沿/窗口触发、数字触发及外部参考时钟同步。
信号调理与校准
-扩展能力：兼容SCXI/SCC信号调理模块，支持传感器接口与高压测量（如±100 V输入）；
-校准技术：NI-MCal技术提升测量精度，建议每2年校准一次。
硬件设计
-接口布局：2个68针VHDCI连接器，支持灵活布线；
-抗干扰设计：输入阻抗>100 GΩ，共模抑制比（CMRR）>100 dB。
Product Overview
NI PXI-6259 is an M series multifunctional data acquisition(DAQ)module launched by National Instruments(NI).It is specially designed for PXI platform and is suitable for industrial automation,laboratory testing and high-precision measurement scenarios.Its core functions include analog input/output(AI/AO),digital I/O(DIO),counter/timer,and support synchronous triggering and multi-task coordination to meet complex DAQ needs.
Core parameters and performance
Analog input(AI)
-Number of channels:32 single-ended or 16 differential channels;
-Resolution and sampling rate:16-bit,single-channel maximum speed of 1.25 MS/s,multi-channel aggregation of 1 MS/s;
-Input range:±100 mV to±10 V programmable gain adjustment.
Analog output(AO)
-Number of channels:4 independent outputs;
-Resolution and update rate:16 bits,single channel maximum speed 2.86 MS/s.
Digital I/O(DIO)
-Number of channels:48 channels(32 channels can reach 10 MHz with high speed);
-Level compatibility:5 V TTL/CMOS logic.
Counter/Timer
-Quantity and functions:2 32-bit counters,supporting quadrature encoder(X1/X2/X4 mode),PWM generation and frequency measurement.
Technical Features
Synchronization and Triggering
-AO and DO synchronization:Share the sampling clock through the AO timing engine to ensure timing consistency(the DO task must be started first);
-Trigger mode:Supports analog edge/window trigger,digital trigger and external reference clock synchronization.
Signal conditioning and calibration
-Extended capability:compatible with SCXI/SCC signal conditioning module,supports sensor interface and high voltage measurement(such as±100 V input);
-Calibration technology:NI-MCal technology improves measurement accuracy,and it is recommended to calibrate once every 2 years.
Hardware design
-Interface layout:2 68-pin VHDCI connectors,support for flexible wiring;
-Anti-interference design:Input impedance>100 GΩ,common mode rejection ratio(CMRR)>100 dB.
