Intelligent Loop Resistance Tester
Darui Electric recommends：
Intelligent Loop Resistance TesterDesigned with high-frequency switching power supply and digital circuit technology. Suitable for switchgear loop resistance measurement. Test current uses 100A and 200A DC per national standards, directly measuring loop resistance with results displayed on a large LCD screen, featuring data storage, print output, and time setting functions. Additional 50A and 150A ranges are available. Accurate measurements with stable performance, meeting on-site HV switch maintenance and factory loop resistance testing requirements.
Performance Features
High current: latest switching power tech for continuous high-current output, effectively breaks through contact oxidation film for accurate results.
High Stability: last digit of LCD remains stable within ±1 digit under severe interference, with stable and repeatable readings.
High Precision: dual high-speed 16-bit Σ-Δ AD sampling with latest DSP technology achieves 0.01μΩ resolution. The only domestic tester achieving 0.01μΩ with excellent stability, surpassing imported high-current micro-ohmmeters.
Intelligent: imported high-performance CPU with auto-ranging for guaranteed accuracy. Over-temperature protection auto-stops output for safe operation.
High Quality: all key components imported. Temperature compensation eliminates environmental effects. Military-grade connectors enhance vibration resistance.
Powerful: current selectable between 50A/100A, test time adjustable 5s~599s. Overcomes limitations of comparable instruments, far exceeding their performance.
User-Friendly: rotary mouse for convenient data entry. Set date/time, save measurements in real-time, and print results instantly.
Communication: USB or RS232 serial
(9) Convenient: compact and lightweight for easy portability.
Technical Specifications
Intelligent Loop Resistance Tester
Resolution: 1μΩ
100.0~2999.9，0.1μΩ
Test Current: DC50A、100A
Accuracy: ±(0.5% rd+2d)
Continuous operation: 5s-599s
Display: large Chinese LCD
Communication: USB or RS232 serial
Power: AC220V±10%, 50Hz
Power: 600W
Max storage: 200 records
Operating: -10C~40C, RH ≤80%
Dimensions: 380×300×260 mm3
Weight: 6kg (excl. accessories)
Faults & Troubleshooting
Symptom / Remedy
No response on startup: check AC power.
Check power cable
Check fuse base for blown fuse.
High resistance reading: check if test resistance too large.
Check voltage input leads inside current output leads.
Check test lead polarity.
Check voltage output leads and contact oxidation.
Power cycle if rotary mouse unresponsive.
Press reset button
Communication failed: check data cable.
Check if instrument is in online mode
Reinstall driver.
Press reset button
Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.
