Product Details

QK400A Intelligent Loop Resistance Tester
Darui Electric recommends:
Overview:

The QK400A Intelligent Loop Resistance Tester adopts the DC test current recommended by GB 763-90, complying with requirements of IEC 694-84 and IEC 56 for loop resistance testing.
1. Features anti-power-frequency-interference functionality.
2. Test current auto-stabilizes without manual adjustment.
3. Automatic constant current effectively reduces the impact of AC power supply fluctuations on testing.
4. Uses potentiometer measurement principle with synchronized high-speed data sampling, eliminating the influence of test current fluctuations on instrument accuracy.
5. Adopts four-terminal connection method, effectively eliminating the impact of test lead resistance and contact resistance on test results.
6. Simple operation — just press the test button to obtain the measured loop resistance value and test current value.
7. Loop resistance value auto-latches for convenient record viewing.
8. Compact size and lightweight, easy to carry.
9. Comes with flexible test leads and dedicated clamps.

Main Technical Specifications:
1. Test current: 100A / 200A / 400A
2. Test range: 100A/200A range 0-9999.9μΩ; 400A range 0~1999.9μΩ
3. Accuracy: 1% ±2 digits
4. Display: 5-digit loop resistance display with latch; digital test current display
5. Working mode: intermittent, continuous
6. Power supply: 220V ±10%, 50 Hz
Precautions:
1. Do not open the case to ensure personal safety.
2. This instrument contains no user-serviceable parts. Contact the manufacturer if abnormalities occur.
3. Working mode (air-cooled): at rated output, operate 60 seconds, rest 120 seconds, measure three times.
4. Load capacity in constant current mode: at 600A, load resistance ≤2mΩ (2000μΩ).
5. Protection functions: output overvoltage protection (non-auto-recovery), overload protection, overheat protection (auto-recovery).


Note: The above information and technical parameters are provided by Yangzhou Darui Electric Co., Ltd.