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ISO 9001 and 17025 Certified


WRM-10P S2

Winding Resistance Ohmmeter

9137-UC [110V]
9138-UC [220V]

The WRM-10P S2 is Vanguard's second generation lightweight winding resistance meter 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-10P S2 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. For greater flexibility in the field, the WRM-10P S2 comes with a built-in 2.5" wide thermal printer used for printing test reports.

  • 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
  • Stores 100 records (up to 64 readings each)
  • Built in 2.5" wide thermal printer
  • Weighs less than 28 lbs.

WRM-10P S2



WRM-10P S2

Technical Specifications

TYPE Portable transformer winding resistance meter
PHYSICAL SPECIFICATIONS Dimensions: 17.5”W x 11.75”H x 12.5”D (44.5 cm x 29.8 cm x 31.8 cm)
Weight: 27 lbs (12.2 kg)
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 CURRENT RANGE Auto range, 10 Amperes max
DISPLAY 5" back-lit LCD screen (240 x 128 pixels) viewable in bright sunlight and low-light levels
PRINTER 2.5-inch wide built-in thermal printer
KEYPAD Rugged "QWERTY"-style membrane keypad
INTERNAL TEST RECORD STORAGE Stores 100 test records of 64 readings each
PC SOFTWARE Windows®-based software is included with purchase price
SAFETY Designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 standards
TEMPERATURE Operating: -10˚C to 50˚ C (15˚F to +122˚ F)
Storage: -30˚ C to 70˚ C (-22˚F to +158˚ F)
HUMIDITY 90% RH @ 40°C (104°F), non-condensing
ALTITUDE 2,000 m (6,562 ft) to full safety specifications
CABLES Three 50-foot (15.24m) test cables, one ground cable, one power cord, one USB cable and cable carrying bag
OPTIONS Shipping Case
WARRANTY One year on parts and labor
Specifications are valid at nominal voltage and ambient temperature of +25˚C (+77˚F).
Last updated on February 16, 2009