WINRES-20B, 20A Winding Resistance Tester with built-in Battery & Printer

WINRES-20B is designed using advanced engineering technology to measure the winding resistance of transformers. WINRES-20B can measure current, voltage, power transformer windings and shunt resistors. Applying up to 20A Direct Current allows WINRES-20B to measure the resistance of the transformers fast and accurate.

The smart design of the WINRES-20B makes easier to determine the end of measurement automatically according to users’ decision. WINRES-20B can measure two resistance values simultaneously with 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 configuration of transformers.

Beginning from 0.01 μΩ resistances, WINRES-20B can measure up to 100,000 Ω resistances. WINRES-20B discharges the measured circuit after each test. For inductive load, WINRES-20B can demagnetise the load. The temperature measurement input enables one to connect an optional sensor to WINRES-20B and perform temperature correction automatically. WINRES-20B’s intelligent software allows controlling the current flow if there is a failure in the current circuit. With this feature, WINRES-20B procures added safety to users.

A 7-inch TFT touch display allows WINRES-20B to show all measurement results on a single screen. WINRES-20B can be controlled by USB and optional Bluetooth interface and users can record/store measurement results. In case setting up Laptop or PC for the field test is difficult; users can record data to the device’s internal memory (up to 100 Test Records) or to an external USB flash memory.

With the HighTest Data Management Platform (DMP Software), users can control WINRES-20B, analyse and manage measurement results using a PC. Operators can easily print the measurement results with the 2.28-inch built-in Printer of WINRES-20B. WINRES-20B has a built-in 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-20B, even by less trained staffs.

Three-Phase Adaptor TPA-03 (optional accessory) 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-20B can control tap changer (raise and lower) with its tap changer outputs.

WINRES-20 is a light, compact and rugged device with the protection class IP67 (case closed).

Download Datasheet



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

Technical Features

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 14.4 V 6.9 Ah Built-in Battery
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)
Set of Package WINRES-20B, 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, Bluetooth (factory install), Three-Phase Adapter TPA-03, Temperature Sensor, 33 feet Long Cable Set
WINRES-20B, 20A Winding Resistance Tester with built-in Battery & Printer