FMQJ-3教学用非平衡电桥
产品概述
FMQJ-3教学用非平衡电桥是一款专为高校物理实验设计的综合性教学仪器，集成了单臂电桥、双臂电桥和非平衡电桥三种功能模式。该设备采用开放式结构设计，便于学生理解电桥工作原理并进行多种电路连接实验。仪器配备高精度调节旋钮和数字显示模块，可直观观察测量数据变化，适合开展基础性实验和拓展性研究项目。159
核心功能特点
该电桥支持通过桥臂切换实现单臂、双臂和非平衡三种工作模式，测量范围覆盖1Ω至11.11MΩ（单桥）和10⁻⁶Ω至111Ω（双桥）。非平衡模式下具备电压和功率两种输出方式，调节细度达1Ω，配合外接传感器可实现温度等物理量的间接测量。独特的多端法设计支持二端、三端和四端测量方式，有效消除引线电阻误差，提高实验精度。6817
教学应用价值
仪器特别适用于热敏电阻温度特性研究，通过桥路输出电压变化与电阻变化的对应关系，帮助学生深入理解非平衡电桥的测量原理。面板采用模块化布局和可视化电路图，清晰展示惠斯登电桥与开尔文电桥的物理模型，支持自主设计桥臂组合方案，培养创新实验能力。配套恒压源（0-20V）和恒流源（0.3-10mA）满足不同实验场景需求。71121
技术参数说明
基础参数包含：单桥测量精度±0.2%，双桥±1%，非平衡桥±1%；微调臂分辨率1Ω；工作温度范围20±15℃。结构尺寸为45×31×14cm（长×宽×高），重量约7kg。内置标准电阻网络和双模式检流计（电压型/电流型），各量程可独立选择。加热器和温控仪选配件支持拓展热学实验。5912
Product Overview
The FMQJ-3 Teaching Unbalanced Bridge is a comprehensive educational instrument designed for university physics laboratories, integrating single-arm bridge, double-arm bridge and unbalanced bridge functionalities. Its open-frame structure facilitates hands-on learning of bridge circuit principles, while precision adjustment knobs and digital display modules enable real-time observation of measurement variations, making it ideal for both fundamental experiments and advanced research projects. 1715
Key Features
This versatile device supports mode switching among single-arm, double-arm and unbalanced configurations, with measuring ranges spanning 1Ω-11.11MΩ (single) and 10⁻⁶Ω-111Ω (double). The unbalanced mode offers voltage/power dual outputs at 1Ω resolution, compatible with external sensors for indirect physical quantity measurement. Multi-terminal measurement methods (2/3/4-wire) effectively eliminate lead resistance errors for improved accuracy. 6817
Educational Applications
Particularly effective for thermistor temperature characteristic studies, the instrument demonstrates the correlation between bridge output voltage and resistance variation, deepening students understanding of unbalanced measurement principles. The modular panel layout with visualized circuit diagrams clearly displays Wheatstone and Kelvin bridge models, encouraging innovative circuit design experiments. Built-in dual-mode galvanometers (voltage/current) and optional heating accessories expand thermal experiment possibilities. 112123
Technical Specifications
Key parameters include: ±0.2% single-bridge accuracy, ±1% double-bridge accuracy; 1Ω fine-tuning resolution; operating temperature 20±15℃. Dimensions measure 45×31×14cm (L×W×H) with 7kg weight. The integrated standard resistor network and selectable range galvanometers support flexible experimental configurations. Optional temperature control modules enable extended thermodynamics studies. 5912
FMQJ-3教学用非平衡电桥
的详细介绍
传感器是现代信息采集技术的核心，它由敏感元件和变送电路组成，非平衡电桥就是常见的重要变送电路之一。FMQJ-3型非平衡电桥可与敏感元件组成单臂桥、半桥、全桥，各桥臂均有0～100K欧姆可调旋钮用来调定随心所欲地设定线性区间和桥臂电流，另有一只平衡微调旋钮用来调定数字检流计的零点；非平衡信号由检流计读出或由开关一接线柱输出机外。本品还可接成惠氏单桥或开氏双桥进行相关的研究和测量，一桥多用，作为高教仪器物超所值；面板电路图给出了清晰直观的物理模型。
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| 联接方式 |
测量范围 |
准确度 |
尺度cm2 |
| 单桥 |
1欧姆～1111Ω |
±0.2% |
45*31*14 |
| 双桥 |
10-6～1111Ω |
1% |
重量kg |
| 非平衡桥 |
1欧姆～11KΩ |
1% |
7 |
|
