QJ42直流双臂电桥
产品概述
QJ42直流双臂电桥是一款采用凯尔文电桥线路设计的便携式直流电阻测量仪器，专为工矿企业、实验室及现场环境中的低阻值精确测量而设计。该产品内置指零仪和可安装工作电源的电池盒，能够满足金属导电率、电机绕组、变压器直流电阻等多种场景的测量需求。其核心元件采用优质合金材料绕制，经过严格工艺处理，确保电阻元件的温度系数小、准确度高且长期稳定性优异。125
技术特点
该电桥具备五档倍率调节功能（×10⁻⁴至×1），测量范围覆盖5µΩ至11Ω，分辨力可达5µΩ，基本量程内准确度为2%。采用四端连接法可有效减少导线电阻对测量的影响，特别适合测量接触电阻、开关触点等微小阻值。仪器配备灵敏度可调的晶体管检流计，当滑线盘移动4小格时，检流计指针偏移超过1格，确保测量灵敏度。内置1.5V干电池并联电源和9V叠层电池供电系统，支持外接直流电源扩展使用。1616
操作说明
使用前需装入1.5V电池并预热5分钟，通过调节检流计调零旋钮使指针归零。测量时需根据预估阻值选择倍率档位，先接通检流计（G按钮）再接通电源（B按钮），通过步进读数和滑线盘调节平衡。对于电感电路测量，需遵循"先B后G"的开关顺序，低于0.1Ω测量时应间歇使用电源以保护设备。仪器采用230×200×140mm紧凑型设计，重量仅2.5kg，便于携带。101625
应用领域
本产品广泛应用于金属材料电阻率测定、电力设备绕组电阻检测、工业开关接触电阻分析等领域。在电缆行业可用于导体质量检验，在制造业中适用于焊接质量检查，同时能支持电机、变压器的升温试验研究。其宽量程设计兼顾了实验室精密测量与现场快速检测的双重需求。4915
Product Introduction
The QJ42 DC double-arm bridge is a portable resistance measuring device based on Kelvin bridge principle, designed for precise low-resistance measurement in industrial plants, laboratories and field environments. With built-in null detector and battery compartment, it performs reliably in measuring metal conductivity, motor windings and transformer DC resistance. High-quality alloy resistance elements ensure minimal temperature coefficient and long-term stability. 1517
Key Features
Featuring five ratio ranges (×10⁻⁴ to ×1), the instrument covers 5µΩ-11Ω with 5µΩ resolution and 2% basic accuracy. The four-terminal connection method effectively eliminates lead resistance effects, making it ideal for contact resistance measurement. The adjustable transistor galvanometer provides >1 division deflection per 4 dial divisions movement. Dual power supply includes parallel 1.5V dry cells and 9V laminated batteries, supporting external DC power input. 61922
Operation Guide
After installing batteries and 5-minute warm-up, users should zero the galvanometer before measurement. Select appropriate ratio range, activate galvanometer (G button) before power (B button), then balance using step dials. For inductive circuits, observe "B-first" switching sequence and intermittent operation below 0.1Ω. The compact 230×200×140mm chassis with 2.5kg weight ensures portability. 101625
Applications
This instrument serves diverse sectors including metal resistivity testing, electrical equipment winding analysis, and industrial switch contact inspection. It s particularly valuable for cable conductor quality control, welding integrity verification, and thermal rise studies in motors/transformers, combining lab-grade precision with field-ready durability. 4918
QJ42直流双臂电桥
的详细介绍
型号：QJ42型
本品为开尔文双臂电桥电路，测 量低阻很方便，可用于测量金属电阻率、电机及变压器绕组的直流电阻、电刷及开关的接触电阻等各类低值电阻。型号前有FM为市电型，无FM为电池型。
| 测量范围 |
小步进 |
准确度 |
尺度cm3 |
重量kg |
| 10-4～11Ω |
5μΩ |
2% |
26×23×14 |
2.4 |
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