RM3548-50 Resistance Meter

• basic accuracy: 0.02 %
• maximum resolution: 0.1 µΩ
• fully automated data logging
• high precision portable meter
• comparison function
• memory for up to 1,000 measurements
• USB interface

Applications

• high voltage connection tests in EVs
• motor Winding tests
• cable length testing
• mechanical connection tests

Detailed Product Overview

The HIOKI RM3548-50 Resistance Meter is a portable, high-sensitivity milliohm meter designed for precise low-resistance measurements. With a basic accuracy of 0.02% and a resolution of 0.1 μΩ, it covers a wide measurement range from 3 mΩ to 3 MΩ, making it ideal for detecting even minute changes in contact resistance. Typical applications include testing in electric vehicles (EVs), motor and generator windings, and high-precision cable length measurements.

Compact and lightweight at less than 1 kg, the RM3548-50 is easy to handle and can be used comfortably even in hard-to-reach spaces. Its robust design makes it well suited for fieldwork and maintenance tasks. With a test current of up to 1 A, it provides stable and accurate results for very low resistance values, making it ideal for checking automotive ground continuity and weld quality in aircraft structures.

The instrument features temperature correction to maintain accuracy under changing ambient conditions and includes an interval measurement function for temperature-rise testing. It requires no warm-up or zero adjustment, enabling immediate operation and reliable performance in any environment. With memory for 1,000 data points and USB connectivity, measurement data can be easily stored and transferred for analysis. Additional features such as 70 V DC overvoltage protection and an intuitive user interface ensure dependable and safe operation in demanding field applications.

Combining precision, portability, and ease of use, the RM3548-50 is a versatile choice for industrial inspection, maintenance, and testing. When equipped with the optional Z3210 Bluetooth® adapter, measurement data can be transmitted wirelessly to a smartphone or tablet, simplifying data collection and documentation. A backlit displayprovides clear visibility in low-light environments, and a wide range of optional test leads supports both general and specialized measurements, including coated alloys and sensitive aircraft components.