Winding Resistance Tester

WINRES-20; 20 A Winding Resistance Tester with Built-in Printer


  • Resistance Measurement 0.01 μΩ - 100,000 Ω
  • Current Output 0.001 A - 20 A DC
  • High Accuracy 0.1 %

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

WINRES-20 can measure current, voltage, power transformer windings and shunt resistors.

Applying up to 20 A Direct Current WINRES-20 to measure the resistance of the transformers fast and accurately.

The smart design of the WINRES-20 makes easier to determine the end of measurement automatically according to operators’ decision.

WINRES-20 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-20 can measure up to 100,000 Ω resistance.

WINRES-20 discharge 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 intelligent software allows controlling the current flow if there is a failure in the current circuit. With this feature, WINRES-20 procure added safety to operators.

A 7-inch TFT touch display allows WINRES-20 to show all measurement results on a single screen.

WINRES-20 can be controlled by USB and an optional Bluetooth interface and users can record/store measurement results.

In case setting up a 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 to an external USB flash memory.

With the Data Management Platform (DMP Software), users can control WINRES-20, 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-20.

WINRES-20 have an optional battery power feature that 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 experienced staff.

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-20 can control the tap changer (raise and lower) with its tap changer outputs.

WINRES-20 devices are light, compact and rugged with the protection class IP67 (case closed).


  • 2-channel resistance measurement
  • Measurements from 0.01 μΩ to 100,000 Ω
  • 001 A to 20 A DC adjustable current output
  • 50 V Test Voltage
  • High accuracy (0.1%)
  • Demagnetisation feature
  • On-Load Tap Changer Test
  • User-friendly operation menu
  • Built-in printer (2.28-inch)
  • Data Management Platform (DMP Software) allows WINRES-20 to analyse and manage results on PC
  • Battery Power (Option)
  • Internal memory, USB Flash Drive
  • PC control via USB cable
  • Optional Bluetooth control and communication
  • 7-inch TFT touch display
  • Temperature correction (1 input, optional sensor)
  • 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.

Ordering Information

WINRES-20; 20A Winding Resistance Tester with Built-in Printer

WINRES-20 BLUE; 20A Winding Resistance Tester with Built-in Bluetooth & Printer

WINRES-20B; 20A Winding Resistance Tester with Built-in Battery & Printer

WINRES-20B BLUE; 20A Winding Resistance Tester with Built-in Battery, Bluetooth & Printer

Measurement Parameters

2-channel resistance

Test Voltage

50 V

Current Output

0,001 A ... 20 A DC (User-selectable)

Resistance Measurement

0,01 μΩ ... 100000 Ω


Cirrent Value

Resistance Value


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



Power Supply

100 - 240 V, 47/63 Hz


14.4 V 6.9 Ah built-in battery


Up to 100 records (include up to 25 tap results)


2.28-inch built-in Printer


USB 2.0/1.1 Standard-A, USB 2.0/1.1 Standard-B, Built-in Bluetooth

PC Software

DMP Software


7-inch Colour Touch Display


424 mm x 340 mm x 173 mm 


6,5 kg

Operating Temperature

-10 °C ... +60 °C

Protection Class

IP67 (closed housing)

Set of Package


WINRES-20B BLUE, Power Cable, Ground Cable , 1x 5 m Current Cable Set, 2 x 5 m 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


Hard carrying case, Three-Phase Adapter TPA-03, Temperature Sensor, 10 m (33 ft.) Long Cable Set

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For any information you can contact us by phone or e-mail:
+39 0471 1800338 -

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