1. True three-phase testing: Single-phase power input, internal digital synthesis of three-phase standard sine wave signals, output through high-power amplifier to achieve three-phase power output, with low distortion, high stability, extremely high phase-to-phase symmetry, and test results have better equivalence, avoiding misjudgment of group numbers.

2. Capable of both single-phase measurement and automatic testing of three-phase windings. Both single-phase and three-phase can measure polarity and phase angle, completing the measurement of ratio values, errors, tap positions, tap values, etc., for AB, BC, CA three-phase in one go, with automatic identification of group numbers.

3. Simple operation: No need to select wiring mode or connection group. For Y/△ and △/Y transformers, no external shorting is required. The wiring mode can be automatically switched based on the selected test content.

4. Tap testing: Can quickly measure the ratio and ratio error at each tap changer position. The rated ratio only needs to be input once, and the ratio error at each tap position can be calculated without repeated input.

5. Exclusive innovation: Can use built-in rechargeable battery as working power supply, eliminating the need to find a power source on site. (Optional function)

6. First to introduce the concept of measuring phase angle in ratio testing, capable of measuring the phase angle between high-voltage side and low-voltage side at any angle.

7. Can test the ratio and group (phase angle) of various types of transformers, including single-phase transformers, three-phase transformers, Z-type transformers, rectifier transformers, Scott transformers, and inverse Scott transformers. 

8. Good vibration resistance: The use of military-grade connectors enhances vibration resistance.

9. Uses a 7-inch high-definition color screen to display data effects and vector diagrams, providing intuitive and detailed visuals.

10. Revolutionarily presents the magnitude and phase relationships between voltages and currents in vector diagrams, making it easier for users to intuitively understand the practical significance of each parameter.

11. The test source used by this instrument is a digitally synthesized standard sine digital source, with low distortion and unaffected by the working power supply.

12. Portable: Small size and light weight.