TRUE Three-Phase Transformer Turns Ratio Tester

TURA-X; Device for measuring the transformation ratio of three-phase true RMS transformers (TRMS) with integrated printer / Rapportimeter


  • Ratio Measurement 0.8 to 50,000
  • Test Voltages 1 V to 430 V
  • High Accuracy 0.08%
  • Built-in Printer
  • TRUE 3-Phase

TURA-X are designed using advanced engineering technology to measure the turns ratio of single-phase and three-phase transformers.

Turns ratio measurement of phase-shifting transformers can be done by using TURA-X.

Its user-friendly software has fast, easy, and accurate turns ratio measurement features for current, voltage, and power transformers.

By ANSI/IEEE C57.12.90 measurement method, TURA-X can make precise results. TURA-X are one of the most accurate devices with its wide range ratio (0.8 to 50,000) measurement capability and high precision (0.08 %).

Besides the ratio measurement, TURA-X can also measure excitation current, phase angle, polarity and ratio error.

Even though TURA-X have a three-phase cable configuration, operators can make single-phase transformer tests as well.

TURA-X can detect vector groups automatically. TURA-X have wide operations range from high excitation value current transformers to high powered power transformers at substation with the 1V, 4V, 10V, 40 V, 100 V, 250 V and 430 V AC test voltages generation capability.

A 7-inch colour touch display allows TURA-X  to show all measurement results on a single screen.

USB, Bluetooth (Option) and Flash Memory features allow TURA-X to control, record and store measurement results (up to 100 Test Record).

With the Data Management Platform (DMP Software), users can control TURA-X and analyse measurement results.

Operators can easily print the measurement results with the 2.28-inch built-in Printer of TURA-X.

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

TURA-X can control the tap changer (raise and lower) via its tap changer outputs.

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

In addition to ratio tests, TURA-X can perform the Magnetic Balance Test as well.


  • Turns Ratio Measurement (Single-phase and TRUE three-phase measurement)
  • Ranges from 0.8 to 50,000 ratio measurement
  • High Accuracy (0.08 %)
  • 1V, 4V, 10V, 40V, 100V, 250V & 430V AC test voltage
  • Ratio Error Measurement
  • Magnetic Balance Test
  • Excitation Current, Phase Angle, Polarity Measurement
  • Built-in Printer
  • Optional Battery
  • Automatic vector group detection feature
  • Internal memory, USB Flash Drive
  • PC control via USB cable
  • Optional Bluetooth control and communication


Ordering Information

TURA-X; TRUE Three-Phase Transformer Turns Ratio Tester with Built-in Printer

TURA-X BLUE; TRUE Three-Phase Transformer Turns Ratio Tester with Built-in Bluetooth & Printer

TURA-XB; TRUE Three-Phase Transformer Turns Ratio Tester with Built-in Battery & Printer

TURA-XB BLUE; TRUE Three-Phase Transformer Turns Ratio Tester with Built-in Battery, Bluetooth & Printer

Measurement Parameters

Turn ratio measurement, Excitation current, Phase Angle, Polarity, Ratio Error(%), Vector Group Detection, Magnetic Balance

Ratio Measurement Modes

CT Mode, PT Mode (Single-Phase and True Three-Phase)

Measurement Method

ANSI / IEEE C57.12

Test Voltages

CT: 1 V e 4 V

CT Mode (Phase-Neutral): 1, 4, 10, 40, 100, 250 V

PT Mode (Phase-Phase): 1, 4, 10, 40, 100, 250 V, 430 V

Ratio Range

0,8 - 50000





CT Mode (1 V - 4 V)



0,8 - 399

400 - 4000

PT Mode (10 V- 430 V)




0,8 - 5000

5001 - 12000

12001 - 50000

Phase angle measurement

0 - 360 Degrees

Excitation current

2 A

Power Supply

100 - 240 V, 47/63 Hz

Battery (Option)



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


2.28-inch printer


USB 2.0/1.1 Standard-A, USB 2.0/1.1 Standard-B, Bluetooth (factory install Option)

PC Software

DMP Software 


7-inch colour touch display


424 mm x 340 mm x 173 mm


7,1 kg

Operating Temperature

-10 °C ... + 60 °C

Protection Class

IP67 (closed housing)

Set of Package

TURA-X, Power Cable, Ground Cable , 5 m (16.4 ft.) Standard Test Cable Set, 10 m (33 ft.) Extension Cable Set, Tap Changer Cable Set, USB Cable, Printer Paper (x2), USB flash drive, Instruction Manual (Soft Copy), DMP Software, Cable Bag


Hard Carrying Case, Battery, Bluetooth (factory install option)

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

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