QJ42直流雙臂電橋
產(chǎn)品概述
QJ42直流雙臂電橋是一款采用凱爾文電橋線路設(shè)計(jì)的便攜式直流電阻測(cè)量?jī)x器，專為工礦企業(yè)、實(shí)驗(yàn)室及現(xiàn)場(chǎng)環(huán)境中的低阻值精確測(cè)量而設(shè)計(jì)。該產(chǎn)品內(nèi)置指零儀和可安裝工作電源的電池盒，能夠滿足金屬導(dǎo)電率、電機(jī)繞組、變壓器直流電阻等多種場(chǎng)景的測(cè)量需求。其核心元件采用優(yōu)質(zhì)合金材料繞制，經(jīng)過(guò)嚴(yán)格工藝處理，確保電阻元件的溫度系數(shù)小、準(zhǔn)確度高且長(zhǎng)期穩(wěn)定性優(yōu)異。125
技術(shù)特點(diǎn)
該電橋具備五檔倍率調(diào)節(jié)功能（×10⁻⁴至×1），測(cè)量范圍覆蓋5µΩ至11Ω，分辨力可達(dá)5µΩ，基本量程內(nèi)準(zhǔn)確度為2%。采用四端連接法可有效減少導(dǎo)線電阻對(duì)測(cè)量的影響，特別適合測(cè)量接觸電阻、開關(guān)觸點(diǎn)等微小阻值。儀器配備靈敏度可調(diào)的晶體管檢流計(jì)，當(dāng)滑線盤移動(dòng)4小格時(shí)，檢流計(jì)指針偏移超過(guò)1格，確保測(cè)量靈敏度。內(nèi)置1.5V干電池并聯(lián)電源和9V疊層電池供電系統(tǒng)，支持外接直流電源擴(kuò)展使用。1616
操作說(shuō)明
使用前需裝入1.5V電池并預(yù)熱5分鐘，通過(guò)調(diào)節(jié)檢流計(jì)調(diào)零旋鈕使指針歸零。測(cè)量時(shí)需根據(jù)預(yù)估阻值選擇倍率檔位，先接通檢流計(jì)（G按鈕）再接通電源（B按鈕），通過(guò)步進(jìn)讀數(shù)和滑線盤調(diào)節(jié)平衡。對(duì)于電感電路測(cè)量，需遵循"先B后G"的開關(guān)順序，低于0.1Ω測(cè)量時(shí)應(yīng)間歇使用電源以保護(hù)設(shè)備。儀器采用230×200×140mm緊湊型設(shè)計(jì)，重量?jī)H2.5kg，便于攜帶。101625
應(yīng)用領(lǐng)域
本產(chǎn)品廣泛應(yīng)用于金屬材料電阻率測(cè)定、電力設(shè)備繞組電阻檢測(cè)、工業(yè)開關(guān)接觸電阻分析等領(lǐng)域。在電纜行業(yè)可用于導(dǎo)體質(zhì)量檢驗(yàn)，在制造業(yè)中適用于焊接質(zhì)量檢查，同時(shí)能支持電機(jī)、變壓器的升溫試驗(yàn)研究。其寬量程設(shè)計(jì)兼顧了實(shí)驗(yàn)室精密測(cè)量與現(xiàn)場(chǎng)快速檢測(cè)的雙重需求。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直流雙臂電橋
的詳細(xì)介紹
型號(hào)：QJ42型
本品為開爾文雙臂電橋電路，測(cè) 量低阻很方便，可用于測(cè)量金屬電阻率、電機(jī)及變壓器繞組的直流電阻、電刷及開關(guān)的接觸電阻等各類低值電阻。型號(hào)前有FM為市電型，無(wú)FM為電池型。
| 測(cè)量范圍 |
小步進(jìn) |
準(zhǔn)確度 |
尺度cm3 |
重量kg |
| 10-4～11Ω |
5μΩ |
2% |
26×23×14 |
2.4 |
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