Hioki RM3548-50 High-Precision Portable Resistance Meter

Hioki RM3548-50 Portable Resistance Meter Overview

The Hioki RM3548 redefines the capabilities of portable resistance meters by delivering a basic accuracy of 0.02%, a specification typically reserved for high-end benchtop laboratory equipment. With a maximum resolution of 0.1 µΩ and a maximum testing current of 1A, this handheld device allows engineers and technicians to perform high-precision measurements directly in the field, eliminating the need to transport heavy equipment to the test site.

Ideal for Motor & Transformer Maintenance (Heat Run Tests)

A standout feature of the RM3548 is its ability to streamline the maintenance of large motors and transformers. The device features an Interval Measurement mode that automatically records resistance changes over time. By utilizing the included Z2002 Temperature Sensor, the RM3548 can perform temperature correction, accurately calculating the temperature rise in windings to detect potential overheating or insulation failures before they become critical issues.

Versatile Measurement Range: From Micro-ohms to Mega-ohms

Whether you are inspecting the continuity of a large busbar or checking the quality of conductive sheets, the RM3548 covers an extensive range. It measures from 0.0 µΩ (low-resistance range) up to 3.5 MΩ. This versatility makes it an essential tool for diverse industries, including:

• Electric Vehicles (EV): Testing battery connections and motor windings.

• Aerospace: Verifying airframe bonding and fuselage continuity.

• Power Gen: Inspecting circuit breaker contacts and heavy-duty fuses.

Smart Design for Field Efficiency

Hioki has designed the RM3548 for real-world industrial environments. The unit comes with a strap that allows for hands-free operation, letting the technician focus on placing the probes safely. The internal circuit protection guards the device against limited voltage spikes (up to 70V DC on newer models), protecting the instrument during live maintenance checks.

Seamless Data Management

Manual data logging is prone to errors. The RM3548 features an internal memory capable of storing up to 1,000 data points. Once testing is complete, the integrated USB interface allows for quick data transfer to a PC, enabling effortless report generation and trend analysis for quality control documentation.