OM 17 Micro-ohmmeter
Field 10 A Micro-ohmmeter for Inductive and Non-Inductive Resistances

The OM 17 micro-ohmmeter is designed for field use, whether in the workshop or outdoors, serving as a portable instrument with performance comparable to laboratory-grade equipment. Following the OM 16, the OM 17 offers upgraded performance, particularly in inductive resistance measurements: it provides greater autonomy, allowing for longer testing activities (up to 60 minutes) at a continuous current of 10 A, and faster coil resistance current loading (settling time < 2 seconds). It is easy to use, performing 4-wire measurements on both inductive and non-inductive resistances with continuous or pulsed DC current up to 10 A, delivering high accuracy of 0.05% and a resolution of 0.1 μΩ across various ranges, selectable from 5 mΩ to 2.5 kΩ.

Key Features:
- 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
- 2 programmable thresholds with visual and audible alarms
- Memory: stores up to 1,000 measurements
- Ideal for long-duration testing under continuous 10 A transformer conditions

The OM 17 is user-friendly, robust, and resistant to harsh environments (IP 53 when open / IP 64 when closed, with lockable measurement plugs), widely recommended for indoor and outdoor use across many industries:
- Aerospace
- Energy sector
- Household appliances
- Cable manufacturing
- Telecommunications
- Electronics
- Automotive industry
- Railways

Broad Application Areas:
- Metallization and grounding control
- Welding quality control
- Contact resistance measurement (low-voltage connectors, relays, etc.)
- Electronic component testing
- Coil, transformer, and motor resistance measurement, loss and temperature rise calculation
- Resistivity measurement and length calculation for solid and stranded cables
- Railway and power grid maintenance

Two Current Waveforms:
- Continuous DC current
- Inductive resistances and coils
- Automatic measurement triggering when using triggered test probes
- EMF compensation before measurement

Pulsed Current:
- Non-inductive resistances
- Automatic measurement triggering upon continuity establishment – requires only 1 operator
- Automatic current shutdown at the end of measurement
- EMF compensation before each measurement

Configuration and Display:
All parameters can be programmed directly by the user via the instrument interface or software (LOG OM, optional): measurement current, range, resistance type, units, reference temperature, alarm thresholds and status, and calculations...
The large display of the OM 17 keeps the operator informed 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 displayed messages. Before each measurement, EMF is measured and automatically compensated to enhance accuracy. For non-inductive resistances, one operator is sufficient to perform the measurement, as it is automatically triggered 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 via an external temperature probe.
The OM 17 is battery-powered, with high storage capacity for 1,000 measurements, readable directly on the display or via the Log OM software. Each measurement terminal ensures protection up to 250 V, while any detected overrange, open circuit, or low battery signal is notified via LEDs and displayed messages.