DV-Power – RMO10TW Winding Ohmmeter 5mA – 10A Test Current

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Datasheet - DVPower - RMO-TW Series



RMO-TW series is perfect for winding resistance measurements of inductive objects. It is ideal for testing transformer windings (power transformers, distribution, autotransformers) and for on-load tap changer verification. In addition, any RMO-TW transformer ohmmeter & tap changer analyzer can also perform transformer demagnetization.

The series contains 4 models, with maximal test currents from 10 A (RMO10TW) to 50 A (RMO50TW). They are fitted in a portable and lightweight metal housing.

All transformer ohmmeters from RMO-TW series generate a true DC ripple-free current with automatically regulated measurement and discharging circuit. The injection of current and discharge of energy from the test object are automatically regulated.

Three independent channels enable testing of three windings in series. Consequently, this enables measurements of winding resistance in every tap position of an on-load tap changer without discharging between the tests.

DV-Win software enables control and observation of the test process, as well as saving and analyzing the results on a PC. It provides a test report, arranged in a selectable form as an Excel spreadsheet, PDF, Word, or ASCII format. Additionally, DV-Win measures and calculates the OLTC transition time, the ripple and the winding resistance for each tap changing operation. The software can also perform the calculations necessary for the “Heat Run” test. Finally, a user can export all results in the form of a report.

  • Test current from 5mA to 10A
  • Tests primary and secondary windings simultaneously
  • On-load Tap Changer Analysis
  • Automatic discharge after test
  • Memory for 500 measurements, with DV-Win software
  • Demagnetises core after tests
  • Lightweight 7.5kg aluminium case
  • Supplied with standard lead kit
  • Alternative leads optional
  • 3 Years Warranty