Vanguard WRM-10 Winding Resistance Ohmmeter

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Vanguard WRM-10
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Manual WRM-10 Datasheet
The Vanguard WRM-10 Winding Resistance Ohmmeter is designed to accurately measure the winding resistance of highly inductive power transformers. The unit’s dual resistance-reading input channels can measure two winding resistances simultaneously, and four-wire (Kelvin) connections provide high accuracy and require no lead compensation. The WRM-10 provides stable resistance readings of very large transformers by utilizing a 36Vdc power supply capable of outputting up to 10 Amperes. The resistance reading of a 100MVA transformer can be achieved in 5 minutes or less. The unit’s power supply is cooled by heavy-duty fans designed for continuous operation.
Vanguard WRM-10 Features
  • Auto discharge circuit for operator safety
  • Auto current ranging from 10 mA to 10 A
  • Digital resistance reading from 1 micro-ohm to 2,000 ohms
Vanguard WRM-10 Specs
  • Type: portable transformer winding resistance meter
  • Input power: 100 – 120 Vac or 200 – 240 Vac (factory pre-set), 50/60 Hz
  • Resistance reading range: 1 micro-ohm ¬ 2,000 ohms
  • Accuracy:
    • 1 – 19,999 micro-ohms: ±0.5% reading, ±1 count;
    • 20 – 999 milli-ohms: ±1% reading, ±1 count;
    • 1 – 2,000 ohms: ±1.5% reading, ±1 count
  • Test voltage: 36 Vdc max
  • Test current range: auto range, 10 Amperes max
  • Display: back-lit LCD Screen (16 characters by 2 lines); viewable in bright sunlight and low-light levels
  • Control: Single “turn-and-push” knob
  • Computer Interface: RS-232C port used for factory calibration and diagnostics
  • Safety: designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 standards
  • Cables: three 50-foot test cables, ground cable, power cord and cable bag