Winding Resistance Meter TRM 104


Product: Winding Resistance Meter
Model: TRM 104
Manufacturer: SCOPE
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  • Designed to measure DC winding resistance of highly inductive test objects - Transformers, Generators, Motors etc. for field testing as well as for factory testing
  • Designed to work reliably under live EHV switchyard conditions ensuring operator's safety and repeatability of results
  • Winding Resistance Meter designed for large transformers up to 315MVA
  • Quick stabilization of reading even on large test objects by deploying high open circuit voltage
  • Quick & simple tool to check the condition of OLTC - discontinuity during tap change, if any
  • Direct display of Resistance values
  • Available for continuous testing - powerful, truly continuous DC source with excellent heat management through forced cooling
  • Total instrument and human safety ensured through automatic & quick back-emf discharge after test completion
  • Discharge possible through either voltage or current lead in case of accidental lead disconnection - operator risk is minimized


  • Injects test current of 10A DC for measuring winding resistance as high as 2Ω
  • Has two voltage input (resistance) channels and one test current channel
  • Saves down time, measurement of resistance of 2 windings simultaneously
  • In-built stable DC source and direct display of resistance value
    • Single compact instrument
    • No need to spend time in bridge balancing
    • No need of manual calculation
  • Backlit graphic LCD with a user-friendly menu sets up the instrument for the test
  • Configuration
    • Permits enable / disable of measuring channels
    • Test setup: Current range selection, resistance range selection
  • Easy to use - self guided operation through interactive menu and keyboard
  • No need to compensate lead resistance as Kelvin's Four wire measurement method is used
  • Housed in rugged case enhancing transport-worthiness


Resistance Channel


Temperature Channel

Not Available

Current Range

10A, 1A, 100mA & 10mA Selectable

Resistance Range

2000µΩ, 20mΩ, 200mΩ, 2Ω, 20Ω, 200Ω & 2000Ω

Best Resolution



Value ± 0.5% ± 2 Digits

Display Resolution

Resistance : 4½ Digit (1 count in 19999 counts), Current : 3½ Digit (1 count in 1999 counts)

Open Circuit Voltage

30V DC


Back EMF, Over Temperature, Accidental Disconnection of Lead





Temperature Correction

Not Available

Instrument Display

4 Line, 20 Character, backlit LCD. Resistance & Test Current.


Not Available

Inbuilt Printer

Not Available

PC Connectivity

Not Available

Power Supply

230V AC ± 15%, 50Hz ± 10%, 1 Phase


475 x 405 x 230mm

Instrument Weight



  • Standard Accessories
    • Test Cables 15m long, with CK clamps, 75mm opening - 1 Set
    • Shorting lead, 10m long, with 75mm CK clamps - 1 Set
    • Master Earthing Cable, 7m long - 1 Set
    • Mains Cord, 3m long - 1 No
    • Spare fuses - 1 Set
    • Carrying Case for Test Lead Set - 1 No
    • Operation cum Instruction Manual - 1 No
    • Factory test & Calibration Certificate
    • Warranty Certificate
  • Optional Accessories
    • Test Cables 15m long, with CK clamps of 100mm opening - 1 Set
    • Test Cables 15m long, with CK clamps of 150mm opening - 1 Set
    • Test Cables 20m long, with CK clamps of 75mm opening - 1 Set
    • Test Cables 20m long, with CK clamps of 100mm opening - 1 Set
    • Test Cables 20m long, with CK clamps of 150mm opening - 1 Set