Precision micro ohmmeter 10 A


The Precision micro ohmmeter 10 A for micro resistance measurement, which is digital and portable, is a device used to measure the resistance of electrical connections ranging from 0.01 μOhms to 200 Ohms.

The precision 10 A micro ohmmeter uses the principle of resistance measurement at four points which consists in injecting a current using two cables that are connected at each end of the part to be tested and in reading the voltage of each side with two other cables. This eliminates any uncertainty associated with contact resistances.

The advantage of the DRM-10A, compared to other devices on the market, comes from the injection of a current pulse of only a few hundred milliseconds to generate the current required for the measurement. Unlike a direct current technique of 10 or 100 Amps, the technique used by the DRM-10A micro ohmmeter does not produce any local overheating which could cause the resistance to vary over time. In addition, it makes it possible to reduce the size of the power source while ensuring high operating autonomy.

The precision 10 A micro ohmmeter uses three intensities of current: 10 A for very low resistances, 250 mA for larger resistances and 5 mA for larger resistances. A special function, called winding mode for very small motors, allows this injection current to saturate the winding by extending the pulse duration to 1 second. This has the effect of eliminating the induction effect, which is harmful to precise measurement.

The resolution of the device is 0.01 µOhms. It is equipped with a DSP processor which makes a selection of fully automatic measurement scales, that eliminates offsets and stray voltages. With its unique filtering system, the DRM-10A micro ohmmeter can be used despite the presence of strong magnetic fields.

The 10 A precision micro ohmmeter is much lighter and easier to handle than other devices on the market, it is shock resistant and is particularly suitable for construction site applications. Its liquid crystal display with illumination allows the usage in dark places. A standard set of cables and alligator clips are supplied with the device, but other more specific probes are available.

The 10 A precision micro ohmmeter is equipped with a serial port (RS-232) for programming the device. This port is located on the same connector as the built-in battery charger. An RS232 to USB adapter is provided upon your request.

The DRM 10AV model is a modified version which has a speaker signaling the completion of the measurement and the validity of the result.

Please refer to the dedicated page of our supplier NDB Technology Inc. for the entire range.

Micro ohmmeter of precision 10 A, 0,01 µOhms resolution, for micro resistance measurement NDB Technologie
Micro ohmmeter of precision 10 A, 0,01 µOhm resolution, for micro resistance measurement on site NDB Technologie


DRM-10A User’s Manual



  • 10 A precision micro ohmmeter
  • NDB Technology manufacturer, made in Canada.
  • Resolution 0.01 µOhms.
  • Measuring range 0.01 µOhms to 200 Ohms.
  • Measurement error 0.1%.
  • Scale error +/- 2 counts (LSB).
  • Four point measurement method.
  • Three measuring currents 10 A, 250 mA and 5 mA.
  • 200 ms measurement pulse.
  • 5000 measurements with the 10 amp micro ohmmeter.
  • Automatic switch-off of the device after 2 minutes of inaction.
  • Automatic switch-off of the rear lighting after 30 seconds
  • Display of results in large print.
  • Standard set of connection cables fitted with alligator-type clips.
  • Integrated battery charger.
  • RS232 and USB interfaces.
  • Specific probes on request.
  • Reference resistance 9.5 µOhms and 500 µOhms.
  • Padded nylon protective case.
  • Transport case.


Reference: portable micro ohmmeter 10 A (DRM-10A)

Measuring range 20 μOhms to 200 Ohms
Precision +/- (0.1% of reading + 2 µOhms)
Resolution 0,01 μOhms
Operating temperature - 20 °C to + 50 °C
Storage temperature - 40 °C to + 50 °C
Humidity 0 to 95% non-condensing
Submersible, water resistant
Micro ohmmeter autonomy > 12,000 measurements at 10 A (for resistance <50 mOhms)
> 10,000 measurements for other currents
Battery Type 6 rechargeable batteries (1.2 V, 2.1 Ah type 'AA' NiMH)
Display Type Backlit LCD, size 60 x 41 mm
2 brightness levels (100%, 50%)

Dimension (mm) 203 / 114 / 51
Weight 0,86 Kg