Sonel MMR 620 DLRO Micro Ohmmeter

The Sonel MMR 620 DLRO Micro Ohmmeter is a professional-grade instrument designed for precise measurement of very low resistance values in electrical circuits. Ideal for testing busbars, circuit breakers, transformers, welding joints, and high-current connections, this micro ohmmeter delivers accurate results with high repeatability, making it an essential tool for electricians, maintenance teams, and industrial engineers.

Equipped with advanced 4-wire Kelvin measurement technology, the MMR 620 ensures that contact resistance, lead resistance, and environmental factors are minimized for precise readings. Its robust construction, intuitive interface, and portable design make it suitable for both laboratory and field use.

Key Features:

Measures very low resistances from 0.1 µΩ to 200 mΩ with high accuracy
4-wire (Kelvin) measurement method for precise results
Adjustable test current up to 60 A for different applications
Clear digital display with backlight and data logging capabilities
Rugged, portable design for field use
Automatic polarity switching and noise suppression for accurate readings
Compliant with international standards for low-resistance measurements

Whether used for preventive maintenance, commissioning, or troubleshooting, the Sonel MMR 620 DLRO Micro Ohmmeter provides fast, reliable, and precise low-resistance measurements, helping ensure the safety and performance of electrical systems.

Specifications

1. Electrical Measurement

Resistance Measurement Range: 0.1 µΩ – 200 mΩ
Measurement Current: 1 A – 60 A (adjustable)
Measurement Accuracy: ±0.2 % of reading ±2 digits
Measurement Method: 4-wire (Kelvin) technique
Display Resolution: Up to 0.1 µΩ

2. Measurement Functions

Low-resistance testing of busbars, transformers, cables, and welding joints
Measurement of contact and connection resistance
Automatic polarity switching
Noise suppression for stable readings
Hold and data logging functions (optional, via software)
Test duration adjustable for heating effects

3. Display & Interface

Large backlit digital display for easy reading
Menu-driven interface with clear icons
Indicators for overload, connection error, and test status
USB / RS232 interface for data transfer to PC (optional)

4. Safety & Compliance

Overcurrent and short-circuit protection
Compliant with IEC 61557-4 for low-resistance measurements
Insulated and rugged housing for safe field operation
Suitable for CAT III environments

5. Physical & Environmental

Dimensions: Approx. 280 × 160 × 100 mm
Weight: ~3.5 kg
Operating Temperature: -10°C to +50°C
Storage Temperature: -20°C to +70°C
Humidity: 0 – 95 % non-condensing
Housing: Rugged, portable, impact-resistant case

6. Accessories (Typical)

Test leads and Kelvin clamps
Carrying case for portability
User manual and calibration certificate
Optional software for logging and analysis
High-current cables for 60 A measurements

4-Wire Kelvin Ohmmeter

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