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Weschler Instruments is a manufacturer and distributor of electrical and electronic measurement equipment. Customers worldwide use our products in power plants, steel mills, chemical plants, paper mills and other industrial applications that require rugged, reliable and accurate instrumentation.
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Hioki High-Precision Resistance Meter

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The Hioki RM3548 features a portable design that allows it to be used not only in the production, maintenance, and inspection of large coils, motors, and transformers, but also in applications such as the testing of electric vehicles, hybrid vehicles, and aircraft. Despite a battery-powered design, the instrument is capable of highly reliable measurement thanks to a measurement current of 1 A, a maximum measurement accuracy of 0.02%, and a measurement range of 0.000 mOhm to 3.5000 MOhm.

Windings in coils, motors and transformers, must be tested for temperature changes to verify that they do not throw off an abnormal amount of heat. However, because they are located inside motors and other equipment, the temperature of windings cannot be measured directly. Instead, it is typical to use a temperature testing technique in which a resistance value is measured and converted to a temperature.

The RM3548 provides an interval measurement function that can take readings continuously at an interval as short as 0.2 seconds. This makes it ideal for use in temperature rise testing.

Principle Applications

  • Testing of electronic components, coils and inductors
  • Maintenance and management of electric vehicles and aircraft


  • High-precision specs in a portable package (accuracy of 0.02% rdg.)
  • Measure from 0.0 µOhm (@ 1 A) to 3.5 MOhm
  • 1 mOhm or 0.1mOhm resolution
  • Easily record up to 1,000 data points in memory simply by applying the instrument’s probes.
  • Smoothly capture temperature-rise test data using interval measurement.
  • Portable design is ideal for maintenance and testing of large equipment.
  • No warmup period or zero adjustment required.
  • Dramatically improved overvoltage resistance (protection up to 70 V DC)

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