OM27 Benchtop Micro-ohmmeter
Thanks to its color interface and ease of use, it measures any inductive or non-inductive resistance with 4-wire connections, using continuous or pulsed DC current up to 10 A.

With 0.05% accuracy of reading and 0.1 μΩ resolution (on the 5 mΩ range), it covers a wide selection. The OM 27 micro-ohmmeter is designed for field and workshop use, on platforms or outdoors. Its metal housing makes it robust and durable, enhancing its reliability and usability.

It comes standard with a battery, allowing for measurement activities on-site. It supports long-duration measurements (up to 60 minutes) at 10 A DC current and offers a range from 5 mΩ to 2.5 kΩ.

OM27 Benchtop Micro-ohmmeter

Key Features:

- Color touchscreen

- Battery and mains operation

- 4-wire measurement for inductive and non-inductive resistances

- Continuous or pulsed DC current, from 1 mA to 10 A

- Accuracy: 0.05% of reading

- Automatic EMF compensation

- Ambient temperature compensation (measured or programmed)

- Metal temperature coefficient compensation

- Selection of reference temperature

- Two programmable thresholds with visual and audible alarms

- Memory: stores up to 1,000 measurements

Wide Range of Applications
- Metallization and grounding control

- Welding quality control

- Contact resistance measurement (low-voltage connectors, relays...)

- Electronic component testing

- Coil, transformer, and motor resistance measurement; loss and temperature rise calculation

- Resistivity measurement and length calculation for twisted and non-twisted cables

- Railway and power grid maintenance

The OM27 Benchtop Micro-ohmmeter is easy to use, robust, and protected (metal housing), making it suitable for laboratory and production applications or integration into test benches:

- Aerospace

- Energy sector

- Home appliances

- Cable manufacturing

- Telecommunications

- Electronics

- Automotive industry

- Railways

- Motor manufacturing

Two Current Waveforms
Continuous DC Current
- Inductive resistances and coils

- Automatic measurement triggering when using a trigger test probe

- EMF compensation before measurement

Pulsed Current
- Non-inductive resistances

- Automatic measurement triggering upon continuity establishment – requires one operator

- Automatic current shutdown at the end of measurement; EMF compensation before each measurement

Configuration and Display
All parameters are user-programmable, either directly via the instrument interface or through software (LOG OM, optional): measurement current, range, resistance type, unit, reference temperature, alarm thresholds and status, calculations, etc. The OM 27’s large display informs the operator in real-time about the measurement itself and the measurement conditions. Any range overrun, open circuit, or low battery detection is indicated by LEDs and messages on the screen. Before each measurement, EMF is measured and automatically removed to improve accuracy. For non-inductive resistances, a single operator can perform measurements, as it triggers automatically once continuity is established between two points. Users can also set the metal type or its temperature coefficient, reference temperature, and ambient temperature. Ambient temperature can also be measured using an external temperature probe. The OM 27 is battery-powered and has a high storage capacity of 1,000 measurements, which can be read directly on the display.

It ensures protection up to 250 V per measurement terminal, while notifying any detected overrange, open circuit, or empty battery signal via LEDs and displayed messages.