OM 21 Benchtop Micro-Ohmmeter

The OM 21 Benchtop Micro-Ohmmeter is used for 4-wire measurement of *low resistance values up to 20 kΩ with an accuracy of 0.03% RDG and a resolution of 0.1 μΩ. Measurement reliability and accuracy are enhanced through a low temperature coefficient of 10 ppm/°C, automatic removal of EMF parasites before each measurement, metal temperature compensation, and ambient temperature compensation.

The OM 21 Low Resistance Ohmmeter offers three current waveforms (continuous current, pulsed current, or AC current), with a current range from 100 μA to 10 A, and highly flexible triggering and sampling conditions, covering a wide range of applications: cable resistance and resistivity measurement, inductive resistance measurement (motor and transformer winding resistance), contact resistance measurement (connectors, switches, relays, etc.), low-power electrical components (fuses, etc.) and thermistor device testing, metallization/grounding and ground continuity measurement.

The OM 21 can be fully programmed by the user directly through the instrument interface or via the LOG OM management software, with options including: selection of measurement current, resistance range, measurement units, metal under test, alarms, trigger conditions, measurement storage...

Up to 1,000 samples can be stored within the instrument and recalled directly on the display or on a computer via LOG OM.

The instrument is powered by mains or rechargeable batteries and is electronically calibrated without *any internal adjustments.

General Specifications

Size: 225 x 88 x 310 mm

Weight: 2 to 3 kg, depending on options

Display: LCD 26,000 counts, 16-digit backlight, 11.5 mm height

Power Supply: 115 / 230 V (50 / 60 Hz) Battery with built-in charger (optional)

Type: 12 V battery pack

Battery Life: 2 to 8 hours depending on usage

Charging Time: 14 hours

Communication Ports:

Standard RS 232

IEEE 488-2 input option

Allows direct programming, management, and unit calibration from a computer

Storage Capacity:

1,000 measurements, including average, minimum, and maximum values

Memory readout directly on the display or via digital and analog interfaces

Environmental Specifications

Reference Range: 23°C ±1°C (Relative Humidity: 45 to 75%, no condensation)

Operating Reference Range: 0 to 50°C (Relative Humidity: 20 to 80%, no condensation)

Limited Operating Range: -10°C to +50°C (Relative Humidity: 10 to 80%, no condensation)

Storage Temperature Limits: -30°C to +55°C (-15°C to +50°C for models with battery)

Protection IP: IP40

Altitude: 2,500 meters