QJ31直流单双臂电桥产品介绍（中文）
QJ31型直流单双臂电桥是一款多功能电阻测量仪器，适用于实验室、工业现场及教学等场景。该设备采用经典电桥原理设计，结合现代电子技术进行优化改进，具备较高的测量精度和良好的环境适应性，能够满足不同场景下的电阻检测需求。
本产品支持单臂电桥与双臂电桥两种工作模式自由切换，可根据被测电阻的阻值范围选择合适的测量方式。单臂模式适用于10μΩ至11.11kΩ的中低阻值测量，双臂模式可有效消除导线电阻对测量结果的影响，特别适合1μΩ至111.1Ω范围的精密测量。测量系统内置精密比例臂和可调标准电阻，配合灵敏检流计，确保测量结果稳定可靠。
设备采用模块化设计，操作面板布局科学合理，功能旋钮与接线端子标识清晰。旋转式量程开关配备多档位选择，配合四位半数字显示屏，可实现直观的测量数值读取。内部电路经过特殊抗干扰处理，在复杂电磁环境下仍能保持稳定工作状态。外壳选用工程防护材料，兼顾轻量化与耐用性需求，便于实验室固定安装或现场移动使用。
该电桥可广泛应用于电力设备维护、电子元器件检测、材料电阻率分析等领域。在变压器绕组测试、开关接触电阻测量、精密分流器校准等工作中表现优异。仪器配备温度补偿功能，有效降低环境温度波动对测量精度的影响，确保在10℃-35℃工作温度范围内保持优良性能。
（英文介绍）QJ31 DC Single/Double Bridge Product Introduction
The QJ31 DC Single/Double Bridge is a precision resistance measuring instrument designed for laboratory, industrial and educational applications. Integrating traditional bridge principles with modern circuit design, this device delivers reliable measurement performance with enhanced operational stability.
This dual-mode instrument features selectable single-arm and double-arm bridge configurations, providing flexible measurement solutions for various resistance ranges. The single-arm mode covers 10μΩ to 11.11kΩ measurements, while the double-arm configuration minimizes lead resistance effects for high-precision 1μΩ to 111.1Ω measurements. Its precision ratio arm and adjustable standard resistors work in conjunction with a sensitive galvanometer to ensure measurement accuracy.
The user-friendly interface includes clearly labeled terminals and a rotary range selector with multiple measurement scales. The four-and-a-half-digit LED display ensures clear readability, while the optimized circuit design provides stable operation in electromagnetically challenging environments. The lightweight yet durable enclosure combines portability with robust construction for both stationary and mobile applications.
Ideal for power equipment maintenance, electronic component testing, and material resistivity analysis, this instrument excels in transformer winding measurements, contact resistance testing, and shunt calibration tasks. The built-in temperature compensation mechanism effectively counteracts environmental temperature variations, maintaining measurement consistency within 10℃ to 35℃ operational range. Simplified operation procedures and maintenance requirements make it suitable for both professional technicians and educational purposes.
