Digital ratiometer HZTTR80A

for transformers

• Test Range: Ratio 0.9–10000, Current 0–2000 mA, Angle 0–360° • Ratio Accuracy: ±0.1% to ±0.5% • Current Accuracy: ±1% of reading + 0.5 mA • Angle Accuracy: ±0.2° • Output Voltage: 5V or 80V selectable • Resolution: Ratio 0.0001, Current 0.001 mA, Angle 0.01° • Test Voltage: AC 5V or 80V • Power Supply: 100–240V AC, 50/60 Hz • Ambient Temperature: -10°C to +40°C • Humidity: ≤85%, non-condensing • Dimensions: Main Unit 360×290×170 mm, Cable Box 360×290×170 mm The HZTTR80A Transformer Ratio Tester is a fully automatic and portable instrument for measuring transformer turn ratio, voltage ratio, vector group, polarity, winding connections, tap positions, and excitation current. Both the tester and accessories are stored in a durable engineering plastic case resistant to water, dust, impact, heat, and cold, making it ideal for field use. It tests single-phase and three-phase transformers, with or without taps. Blind testing enables recognition of unknown vector groups and phase relationships, while the device also supports autotransformers, Z-type, and phase-shifting transformers. Control is simplified via an Android app for wireless operation, storage, and data upload. Features include graphical display, simultaneous three-phase ratio measurement for faster testing, and flexible tap settings for both high- and low-voltage sides. The HZTTR80A delivers reliable accuracy, intuitive use, and efficiency in transformer testing.