QJ44a直流双臂电桥
产品概述
QJ44a直流双臂电桥是一款便携式精密测量仪器，采用凯尔文四线制原理设计，适用于工矿企业、实验室及现场环境对直流低值电阻的高精度测量。该产品无需额外附件即可完成电机绕组、变压器直流电阻、开关接触电阻等测量任务，同时支持通过四端夹具扩展金属材料电阻率测定功能。仪器内嵌集成电路电子检流计和双电源系统，具备操作便捷、稳定性强的特点，满足各类低阻值场景的测量需求。16
核心性能
仪器提供0.0001Ω至11Ω的宽量程覆盖，通过×0.01至×100五档量程系数实现精准匹配。采用灵敏度可调的电子检流计，分度值≤1×10-7A/mm，配合1.5V工作电源和9V检流计电源，确保测量过程稳定可靠。其机械结构采用抗冲击设计，外形尺寸为300×255×150mm，重量约4.5kg，兼顾便携性与耐用性。特殊设计的四端接线法能有效消除导线电阻和接触电阻对测量结果的影响。27
技术特点
QJ44a通过优化电路布局实现0.2级精度等级，在5-45℃环境温度下保持测量一致性。独创的间歇式电源管理技术可在测量0.1Ω以下阻值时自动调节功耗，延长电池寿命。检流计配备机械/电气双重调零功能，支持灵敏度分级调节以适应不同测量场景。针对电感类被测物，智能操作流程（先通B后通G）有效抑制感应电动势干扰。811
应用场景
本产品广泛应用于金属导体电阻率分析、工业设备接触电阻检测、电力系统接地电阻测量等领域。特别适用于电机/变压器生产质检、线缆行业工艺控制、科研机构材料研究等场景。其野外适应能力使其成为地质勘探、电力巡检等移动工作的理想工具。1013
Introduction
The QJ44a DC double-arm bridge is a portable measuring device based on Kelvin 4-wire principle, designed for precise low-resistance measurement in laboratories, industrial sites and field environments. With built-in IC electronic galvanometer and dual power supply system, it performs direct measurements on motor windings, transformer DC resistance and switch contact resistance without additional accessories, while supporting material resistivity tests via optional 4-terminal fixtures. Its compact structure (300×255×150mm) and 4.5kg weight ensure excellent portability. 618
Key Features
Featuring 0.0001Ω-11Ω measurement range with five selectable multipliers (×0.01 to ×100), the instrument achieves 0.2-class accuracy through optimized circuit design. The adjustable-sensitivity galvanometer (≤1×10-7A/mm) works with 1.5V main power and 9V auxiliary supply to deliver stable performance. Proprietary four-terminal measurement effectively eliminates lead resistance interference. Automatic power management reduces consumption during sub-0.1Ω measurements. Dual nulling (mechanical/electrical) and stepped sensitivity adjustment enhance operational flexibility. 712
Operational Advantages
This bridge incorporates intelligent workflow for inductive loads (B-G sequential switching) to suppress interference. The rugged casing provides vibration resistance for field use. Clear panel layout includes external power terminals for extended operation. Special attention was given to contact protection - oxidation-prone areas use corrosion-resistant materials with protective coating. The instrument maintains consistency across 5-45℃ temperature range. 1419
Application Fields
Ideal for diverse scenarios including: metal conductivity research, industrial equipment maintenance, power system ground testing. Particularly suitable for quality control in motor/transformer manufacturing, process monitoring in cable production, and scientific material analysis. Its environmental adaptability makes it valuable for geological surveys and mobile power inspections. 1025
QJ44a直流双臂电桥
的详细介绍
本品为携带式双臂电桥，不用附件就可以准确测定电机变压器直流电阻、开关接触电阻等，还可借助四端夹具（本厂有售）测定金属试样的材质电阻率。型号前有FM为市电型，无FM为电池型。
| 型号 |
测量范围 |
小步进 |
准确度 |
尺度cm3 |
| QJ44 |
10-4～11Ω
|
5mΩ
|
0.2 |
31*26*16 |
| FMQJ44A |
| QJ44A |
10-4～11Ω
|
5mΩ
|
0.1 |
重量kg |
| FMQJ44a |
3 |
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