Hioki RM3545A-1 – Resistance Meter (Single Channel)

• 0.045% basic accuracy, 1 nΩ max. resolution, 1A max. testing current
• Measure from 1 nΩ (testing current 1 A) to 1200 MΩ
• Equipped with advanced features, ensuring precise resistance measurement (OVC, temperature measurement, and correction function)
• High path resistance tolerance allows seamless integration into an automatic test system, eliminating concerns about wiring or contact resistance
• Advanced contact-check, comparator function, control, and communications features

As electric mobility gains popularity, manufacturers are developing components for higher currents and voltages. Since even minuscule amounts of resistance can have a significant impact on energy efficiency and safety, more accurate quality control focusing on resistance is required. The Resistance Meter RM3545A facilitates accurate resistance measurements and is suitable for diverse applications in development and production lines.

Electric resistance is measured by passing a current through a measurement target such as a weld. Pass and fail judgments are generated based on variation in resistance values. A typical low-resistance weld can have resistance ranging from 10 μΩ to 100 μΩ. The Resistance Meter RM3545A provides a 1000 μΩ range and 1 nΩ resolution, allowing it to measure low resistance values with a high degree of precision. If a weld is insufficient, its resistance value will exceed that of a non-defective weld. Pass and fail results are generated for non-defective and defective welds based on minuscule differences in their resistance values. Weld quality can be managed quantitatively for all welds passing through a production line, ensuring traceability.

Offset voltage correction function (OVC)

When measuring low resistance, due to the voltage generated when different metals come into contact with one another (known as electromagnetic force, or EMF), the measurement values can be unstable. The Hioki RM3545A is built in with an Offset Voltage Compensation (OVC) function to correct for the effects of EMF, making the instrument ideal for measuring low resistance of the welding points of busbars.

The resistance values vary with temperature. To ensure consistent testing with a resistance meter, it is necessary to eliminate the effects of temperature. The RM3545A has got you covered.

Temperature correction (TC) function

Temperature correction functions can convert readings to resistance values at a user-specified reference temperature and display the results, even for materials such as copper wire whose resistance varies with temperature. The RM3545A’s temperature correction function converts the measured resistance value Rt at the current temperature t to the resistance value Rt0 at the reference temperature t0, as shown in the figure. The Temperature Sensor Z2001 (included accessory) is used to perform temperature correction.

Temperature measurement function

When using the Temperature Sensor Z2001, the instrument can measure temperature with a high degree of precision (±0.5°C). It can also accept analog input from a radiation thermometer (0 V to 2 V).

Temperature conversion (ΔT) function

This function calculates and displays temperature rise from the measured resistance value and ambient temperature.

Here are the key features of how the RM3545A revolutionizes automated testing in resistance measurement.

High path resistance tolerance

Precise measurement of low resistance necessitates a high-precision range with a large measuring current, but challenges arise due to cable wiring and probe contact resistance, known as path resistances. The RM3545A, with its higher path resistance tolerance, overcomes these challenges, ensuring seamless integration into other systems without concerns about wiring or contact resistance.

LAN interface

The instrument also ships standard with a LAN interface so that it can easily exchange data with other devices like computers and PLCs.

Fast measurement speed

Fast measurement speed (21 ms) that will speed up the tests and thus the speed of production.