DV Power RMO100 High DC Current Resistance MicroOhmMeter


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RMO100 is a micro-ohmmeter based on state of the art technology, using the most advanced switch mode technique available today. RMO250 generates true DC current with automatically regulated test ramps. During the test RMO100 ramps with increasing current before measuring and decreasing current after the measurement. This eliminates magnetic transients.

After the test current has been set, the automatic test procedure is started by pressing the Ω-button. The test result is displayed as R=U/I.  There is enough memory in RMO100 to store 100 measurements. All measurements are time and date stamped. They can also be exported to a PC with RMO-Win software. The software connects a PC to RMO100 using a RS232 cable. The RMO-Win makes it easy to report and analyse all results.

RMO100 has very high ability to cancel electrostatic and electromagnetic interference in high HV electric fields. It is achieved by very efficient filtration. The filtration is made utilizing appropriate hardware and software.


RMO100 can generate DC current continuously using the CONT menu. In this menu the current can be chosen the same way like in the SINGLE menu, but the duration of the test can be preset. The test is started pressing the Ω-button. During the test, a new result is shown on the display and stored into the PC (RMOWin) each second. Using RMOWin the result can be printed like an Excel table which later can be shown as a diagram and used for a report.

The RMO100 output is rated at 100 A continuously at 25C ambient.

Typical application is measuring resistance of:
  • high, middle and low voltage circuit breakers
  • high, middle and low voltage disconnecting switches
  • high-current bus bar joints
  • cable splices
  • welding joints
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Full Review

  • Lightweight - only 7 kg           
  • Powerful - 5A-100A DC         
  • Measuring range 0 - 999 mΩ         
  • Resolution to 0,1 Ω         
  • SINGLE/CONT Mode         
  • Mechanical protection IP54
1 Mains Power Supply
  • Connection     according to IEC/EN60320-1; UL498, CSA 22.2
  • Mains supply     from 90 to 264V AC; 50-60Hz

2 Output data     
  • Test current     5 A - 100 A DC
  • Current duration     100 A continuously
  • Measuring range     Resolution
   0,1Ω - 999,9Ω     0,1 Ω
   1,000mΩ - 9,999mΩ     1 Ω
   10,00mΩ - 99,99mΩ     10 Ω
   100,0mΩ - 999,9mΩ     0,1 mΩ
  • Typical accuracy     (0,2% rdg + 0,2% FS)

3 Environment conditions
  • Operating temperature     -10C - +50C / 14F - +122F
  • Storage and transportation     -25C - +70C / -13F - +158F
  • Humidity     5% - 95% relative humidity, non condensing

4 Dimensions and Weight
  • Dimensions     198 mm x 255 mm x 380 mm (7,8 in x 10 in x 15 in) (W x H x D) without handle
  • Weight     7,0 kg/15,4 lb

5 Mechanical protection     IP54

6 Warranty     two years

7 Safety Standards

European standards     EN 61010-1
International standards     IEC 61010-1; UL 3111-1; CAN/CSA-C22.2 No 1010.1-92

8 Electromagnetic Compatibility (EMC)
  • CE conformity     EMC standard 89/336/EEC
  • Emission     EN 50081-2, EN 61000-3-2/3
  • Interference Immunity     EN 50082-2
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