Micro Ohmmeter RMO500D

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  • Lightweight – only 12 kg
  • Powerful 5 A – 500 A DC
  • Measuring range 0 – 999,9 mΩ
  • Resolution to 0,1 μΩ
  • Typical accuracy 0,1 %
  • Remote Control Unit (optional)
  • Both Sides Grounded Unit (optional)
  • Rmax function
  • Demagnetization of a CT core
Micro Ohmmeter RMO500D

RMO500D is a Micro Ohmmeter based on a state of the art technology, using the most advanced switch mode technique available today. RMO500D generates a true DC ripple-free current with automatically regulated test ramps. During a test the RMO500D 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 new feature is the ability to perform a fully automatic demagnetization of a current transformer core after the measurement. Demagnetizing a magnetic core of a current transformer requires alternating current applied with decreasing magnitude down to zero. The RMO500D provides this alternating current by internally changing the polarity of a controlled DC current. During the demagnetization process the instrument supplies a current at decreasing magnitude for each step, following a proprietary developed software solution.
The RMO500D instrument can store internally up to 500 measurements. All measurements are time and date stamped. Using the DV-Win soft-ware a test can be performed from a user’s PC, and the results can be obtained directly on the PC. Communication between the RMO500D and a PC is through an USB (as standard) or an RS232 cable (as an option). Using the DV-Win the result can be arranged as an Excel spread-sheet which can be later shown as a diagram and printed for a report.
The set is equipped with a thermal and an overcurrent protection. The RMO500D has a very high ability to cancel electrostatic and electro-magnetic interference in HV electric fields. It is achieved by very efficient filtration. The filtration is made utilizing a proprietary hardware and software.
The RMO500D instrument has three separate test modes:

  • SINGLE mode
  • CONTIN mode
  • BSG mode

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