Friday, 07 August 2015 15:12 Written by 
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TRM Series precision Winding Resistance Meters are designed for field testing as well as for factory testing of large rotating machines & transformers up to 500 MVA. Winding Resistance values of transformers and rotating machines are directly displayed. These are portable winding resistance meters designed to work in live EHV switchyards up-to 765 kV. A backlit LCD with a user-friendly menu sets up the instrument for the test. These meters are protected against the back-emf offered by large inductive windings.


  • Uses Kelvin’s 4 wire method for resistance measurement.
  • Designed to measure DC winding resistance of highly inductive objects like transformers, generators, motor etc.
  • 30V / 50V* DC open circuit voltage.
  • Simultaneous measurement of 1 / 2 / 3* windings.
  • Quick stabilization of test results
  • Direct readings of all channels on backlit LCD
  • Automatic back-emf discharge with indication
  • Simple setup and use.
  • Operation through keyboard and interactive menu
  • Supplied with rugged aluminium carrying case for enhanced transport worthiness.
  • OLTC discontinuity indication

*- Features available only in TRM25



Parameter TRM14 TRM104 TRM25
Resistance Channels Two Two Three
Temperature Channel Not Available Yes
Current Ranges 1A, 0.1A, 0.01A 10A, 1A, 0.1A, 0.01A 25A, 10A, 5A, 1A, 0.1A, 0.01A
Maximum Resistance Range 2000Ω 2000Ω 2000Ω
Best Resolution 1μΩ 1μΩ 1μΩ
Accuracy Value ± 0.5% ± 2 digits
O/C Voltage 30V DC 50V DC
Protection Back EMF, Over Temperature, Accidental Disconnection of Lead
Discharge Automatic
OLTC Discontinuity indication Yes
 Temperature Correction No Yes
Display 4 Line 20 character backlit LCD for Resistance & Test Current  256 X 128 pixel, backlit graphic LCD for Resistance & Test Current
 Memory No  5000 results
 Inbuilt Printer No  Yes
 PC Connectivity No  Yes
Dimension 475 x 405 x 175 mm 475 x 405 x 230 mm 585 x 480 x 195 mm
Instrument Weight 10 kg 15 kg 20 kg
OLTC Dynamic Test No Yes (Optional)
Read 12654 times Last modified on Tuesday, 13 October 2015 06:38

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