WINRES-20, 20 A Winding Resistance Tester

WINRES-20 is designed by advanced engineering technology to measure the winding resistance of transformers.

WINRES-20 can measure current, voltage, power transformer winding and shunt resistors. Applying up to 20 A DC allows WINRES-20 to measure the winding resistance of transformers quick and precise.

The smart design of WINRES-20 makes more apparent to determine the conclusion of measurements automatically according to users? decision. WINRES-20 can measure two resistance values concurrently by its two voltage measurement channels. Users can prefer to test two primary or two secondary or one primary and one secondary winding according to the transformer configuration.

Beginning from 0.01 ?? resistances, WINRES-20 can measure up to 100,000 ? resistance. WINRES-20 discharges the measured circuit after each test. For inductive load WINRES-20 can demagnetise the load. The temperature measurement input enables one to connect an optional sensor to WINRES-20 and perform temperature correction automatically.

WINRES-20?s intelligent software allows controlling the current flow if there is a failure on the current circuit. With this feature, WINRES-20 procures added safety to users. A 7-inch colour touch display allows WINRES-20 to show all measurement results on a single screen.

WINRES-20 can be controlled by USB-Bluetooth interface and users can record/store measurement results. In case setting up Laptop or PC for the on-field test is difficult; users can record data to the device?s internal memory (up to 100 Test Records) or external USB flash memory.

With the HighTest Data Management Platform (DMP), users can control WINRES-20 and analyse measurement results. Operators can easily print the measurement results with the 2.28-inch built-in Printer of WINRES-20. WINRES-20 has an optional battery power feature which allows users to make tests even when there is no electricity.

Multi-language capability and user-friendly operation menu make it easy to control WINRES-20, even by less trained staff.

Three-Phase Adapter TPA-03 (Optional) allows connecting all primary and secondary sides concurrently, whereby users can select either to test the resistance of all phases or selective phases. With the TPA-03 option, WINRES-20 can control tap changer (raise and lower) via its tap changer outputs.

WINRES-20 is a light, compact and rugged device with the protection of IP67.


  • 2 channel resistance measurement
  • Measurements from 0.01 ?? to 100,000 ?
  • 0.001 A to 20 A DC adjustable current output
  • High accuracy (0.1%)
  • Demagnetisation feature
  • User-friendly operation menu
  • Temperature correction (1 input, sensor optional)
  • Built-in printer (2.28-inch)
  • Data Management Platform (DMP) enables to control WINRES-20 and analyse results
  • Battery Power (Optional)
  • Internal memory, USB Flash Drive
  • PC control via USB cable
  • Bluetooth control and communication (Optional)
  • 7-inch large colour touch display
  • Emergency stop
  • Multi-language
  • Optional Three-Phase Adapter (TPA-03) makes WINRES-20 outputs once a time connectable to three-phase power transformers primary and secondary sides.

Download Datasheet



Measurement Parameters 2-channel resistance
Test Voltage 50 V
Current output From 0.001 A to 20 A DC (User-selectable)
Resistance Measurement From 0.01 μΩ to 100,000 Ω
Accuracy Current Value Resistance Value Accuracy
1 mA – 10 mA Up to 100 kΩ 0.1 % rdg 0.1 % of Fs
10 mA – 100 mA Up to 5 kΩ 0.1 % rdg 0.1 % of Fs
100 mA – 1 A Up to 500 Ω 0.1 % rdg 0.1 % of Fs
1 A Up to 50 Ω 0.1 % rdg 0.1 % of Fs
20 A Up to 2.5 Ω 0.1 % rdg 0.1 % of Fs
Demagnetisation Yes
Power Supply 100 – 240 V, 47/63 Hz
Battery (Option) 14.4 V 6.9 Ah battery (Option)
Memory    Up to 100 records (include up to 25 tap results)
Printer 2.28-inch built-in Printer
Communication USB 2.0/1.1 Standard-A, USB 2.0/1.1 Standard-B, Bluetooth (Factory install option)
PC Software DMP Software
Display 7-inch Colour Touch Display
Dimensions 16.7″ x 13.4″ x 6.8″  (424 mm x 340 mm x 173 mm )
Weight 6.5 kg
Working Temperature -10 °C to +60 °C
Protection Class IP67 (case closed)
Cables 15 feet (4.5 m) cable set
Set of Package WINRES-20, Power Cable, Ground Cable , 1x 15 feet Current Cable Set, 2 x 15 feet Voltage Cable Set, USB Cable, Tap Changer Cable Set, Jumper Cable, Printer Paper (x2), USB flash drive, Instruction Manual (Soft Copy), DMP Software, Cable Bag
Options Hard carrying case, Battery, Bluetooth (factory install), Three-Phase Adapter TPA-03, Temperature Sensor, 30 feet Long Cable Set

Specifications are valid under 25 °C temperature. *Contents subject to change without notice.
Version V04A 04/2020


WINRES-20, 20 A Winding Resistance Tester