The tap changer can be switched directly during measurement, and the instrument will automatically prompt; the new resistance value will be displayed soon.
4. Highly intelligent design with ingenious and advanced function settings, capable of automatically detecting faults such as loose test leads or broken wires.
5. Comprehensive protection functions reliably safeguard the instrument against back EMF impacts, with automatic discharge indication.
6. Displays measurement current and measurement time.
7. Intelligent power management technology effectively reduces internal heat generation.
8. Can store 120 measurement data records, which are retained even after power-off.
9. All menus and operation prompts are in Chinese, intuitive and convenient. 10. The digital resistance meter features high measurement accuracy, stable performance, clear display, wide measurement range, and strong anti-interference capability.
DC Resistance Tester Working Principle:
This tester employs the typical four-wire measurement method to enhance the accuracy of resistance measurements, especially for low resistances. The programmable constant current source, programmable preamplifier, and A/D converter form the core of the measurement circuit. The central control unit applies a constant, high-precision current to the external load under test via the constant current source, then processes the acquired data (including test voltage and current test current) to obtain the actual resistance value.
This instrument can store 255 test data records and can print all stored test data. The stored data is not lost upon reset or power-off.
Technical Specifications:
1. Four output current ranges: 40A, 20A, 10A, 5A
2. Resolution: 0.1μΩ
3. Measuring ranges: 20mΩ - 4Ω (5A range); 10mΩ - 2Ω (10A range);
0.2mΩ - 1Ω (20A range); 0.1mΩ - 0.5Ω (40A range);
4. Accuracy: 0.2%
5. Ambient temperature: 0~40℃
6. Ambient humidity: <90%RH
7. Power supply: AC220V±10%, (50±1)HZ
8. Dimensions: 400×200×350mm
9. Weight: 13kg
Test current: 5A, 10A, 20A, 40A
Measurement range
5A: 1μΩ~4Ω
10A: 1μΩ~2Ω
20A: 1μΩ~1Ω
40A: 1μΩ~0.5Ω
Measurement accuracy ±0.2% (full scale)
Display: 128×64 dot matrix, resistance displayed as 4 1/2 digits
Maximum resolution 0.1μΩ
Power supply: AC 220V±22V, 50Hz±2 Hz, fuse 5A
Maximum power consumption: 600W at 40A test current
Operating environment: Ambient temperature: 0°~40°
Relative humidity: ≤80%
Dimensions: 400╳200╳425 (mm)
Weight: 12kg with accessories
Precautions:
1. Before switching the tap changer of an unloaded regulating transformer, be sure to reset. After discharge, wait until the discharge indication sound ends and the prompt message disappears before switching the tap changer.
3. After testing, press the "Reset" button, and be sure to wait until the discharge indicator light goes out and the prompt message disappears before turning off the power and disconnecting the test leads.
4. During testing, avoid power interruptions or detachment of test clamps.
5. Connect the ground wire before powering on, and disconnect it last after testing.
