Transformer Winding Resistance Meter is designed to measure the winding resistance of transformers, Inductors, generators and motor windings, Tap Changers, Bus Bar contacts,Power Cables etc


It is specially designed for Highly Inductive objects like 765kV/400kV/220kV. This is only indigenous TWRM which gives very fast readings for 3Phase Star -Delta any combination Transformers. The built in open circuit Features Voltage of DC Supply ensures that core of the transformer is saturated for fast measurements to be taken.Care is taken to absorb the Back emf of such transformers. For user safety, Indication for discharge is provided on front panel,if the current through winding under measurement is disturbed/discontinued.


Instrument has built in 10A regulated and highly stable specifical current surce with current seletion of 10A,5A,1A,0.1A Power supply 100mA & 10mA Instrument uses ratio -metric circuit where the resistance of specimen is compared with known internal standard and 4 1/2 digit LCD display is provided for resistance measurement in microohm, milliohms and in ohms.


  • 1. Regulated and highly stable 50V.

  • 2. Current Capacity 10Amp.

  • 3. 4 Line LCD display.

  • 4. Simultaneous measurements of voltage & current.

  • 5. Two channels to measure two windings at a time.

  • 6. True four terminal measurement.

  • 7. Resolution of 0.1 micro ohm.

  • 8. Protection against inductive kickback and discharge.

  • 9.Facility to demagnetize the transformer core after test.

  • 10. Bulit in Thermal Printer.

  • 11. Visual Indication For discharge.

  • 12. Line voltage interference suppression making instrument most suitable for field application.

  • 13. Automatic Discharge.

  • 14. Thermally Protected Power Supply.

  • 15. Internal storage 100 test results

  • 16. Light weight carrying case & with 15 meter leads.

  • 17. Heat run test can be conducted.

  • 18. Temperature compensated value for copper and aluminium..

  • 19. RS 232 port to download data and remote control.

  • 1. POWER SUPPLY : 230V AC ±10%,50Hz, single phase.

  • 2. TEST CURRENT : 10A,5A,1A,0.1A,10mA.

  • 3. RESISTANCE RANGE : 2m‎Ω to 2000‎Ω ( Auto Ranging )

  • 4. DISPLAY : Large clear backlit 4 line 20CH LCD.

  • 5. RESOLUTION : 0.1μΩ at 2milliohm.

  • 6. ACCURACY : ± ± 0.25% of reading ± 5digits

  • 7. DC POWER SUPPLY : 50VDC, 10Amp

  • 8. KEYPAD : 12 Keys Soft-touch.

  • 9. CABLES : Test cables 15mtr ,Ground Cable, Power Chord & Cable Bag.

  • 10. SAFETY SPECS : Complied IEC61010

  • 11. EMI/EMC SPECS : Complied IEC61326

  • 12. WEIGHT : 10Kg( Without Leads )

  • 13. OPERATING TEMP : -10°C to 50°C

  • 14. OPERATING HUMIDITY : 90%RH ( NonCondensing)

Transformer Winding Resistance Meter Model :10AμP

Transformer Winding Resistance Meter