QJ49a直流單臂電橋
產品概述
QJ49a直流單臂電橋是一款基于惠斯登電橋原理設計的高精度便攜式電阻測量儀器，適用于實驗室、工業(yè)現場及野外作業(yè)環(huán)境。該產品采用集成電路指零儀和內附工作電源設計，操作簡便且穩(wěn)定性強，可滿足1Ω至1.1111MΩ范圍內的直流電阻測量需求，典型應用包括金屬導體電阻率測定、電機變壓器繞組檢測、開關接觸電阻分析等場景。其緊湊的外形設計（320×260×160mm）與輕量化機身（約4.5kg）便于攜帶，同時支持外接高靈敏度指零儀以擴展功能。1218
Technical Overview
The QJ49a DC Wheatstone Bridge is a precision portable resistance measuring instrument based on the Wheatstone bridge principle, designed for laboratory, industrial field, and outdoor applications. Featuring an integrated circuit null detector and built-in power supply, it offers user-friendly operation and high stability, covering a measurement range from 1Ω to 1.1111MΩ. Typical applications include resistivity testing of metal conductors, winding resistance analysis in motors and transformers, and contact resistance evaluation of switches. With a compact design (320×260×160mm) and lightweight construction (approx. 4.5kg), it ensures portability while supporting external high-sensitivity null detectors for enhanced functionality. 2722
核心功能
該電橋配備五檔量程倍率（×0.01至×100），通過旋轉式測量盤實現0.1Ω步進調節(jié)，確保測量結果的重復性與準確性。內置電子檢流計具備1.5μV/mm的電壓分辨率和小于4秒的阻尼時間，可快速響應微小信號變化。針對感性負載（如變壓器）測量，設計了先通電后檢流的防沖擊保護機制，避免感應電勢損壞儀器。此外，產品提供微調測量盤（0.01Ω分辨率）用于同名義值電阻的精密比對，滿足科研級精度需求。913
Key Features
Equipped with five range multipliers (×0.01 to ×100) and a rotary measurement dial enabling 0.1Ω step adjustment, the bridge guarantees measurement repeatability and accuracy. Its built-in electronic galvanometer delivers 1.5μV/mm voltage resolution and sub-4-second damping time for rapid response to minute signals. For inductive load measurements (e.g., transformers), a protective sequence of power-on-before-detection prevents damage from back EMF. The fine-tuning dial (0.01Ω resolution) facilitates precise nominal value resistance comparisons, meeting research-grade requirements. 1824
應用場景
在工業(yè)領域，QJ49a廣泛應用于電纜導線品質檢測、焊接點電阻評估及大電流分流器校驗；在電力系統(tǒng)中，可用于變壓器溫升試驗和接地裝置性能分析。其寬溫工作范圍（15~35℃）與防潮設計適應復雜環(huán)境，而機械調零結構和電池電量指示功能進一步提升了現場操作的可靠性。用戶可通過標準四端法接線有效消除引線電阻影響，尤其適合低阻值（<100Ω）精密測量。721
Applications
In industrial settings, the QJ49a is widely used for cable quality inspection, weld joint resistance evaluation, and high-current shunt calibration. Within power systems, it supports transformer thermal rise tests and grounding device performance analysis. Its wide operating temperature range (15~35℃) and moisture-resistant design ensure adaptability to harsh environments, while mechanical zero-adjustment and battery status indicators enhance field operation reliability. The standard four-terminal connection method effectively eliminates lead resistance effects, making it ideal for precision low-resistance (<100Ω) measurements. 516
QJ49a直流單臂電橋
的詳細介紹
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