Product Introduction
The UHV-4000 Transformer On-Load Tap-Changer Tester is designed to inspect the on-load tap changer, the only moving part connected to the transformer circuit. It adheres to the industry standard DL/T846.8—2004, focusing on the action sequence and switching time of the tap changer. The tester measures transition waveform, time, resistance values, and three-phase synchronism, featuring high intelligence with English menu prompts, compact size, lightweight, and strong anti-interference capabilities.

Product Features
1. Lightweight vertical chassis for easy portability.
2. Embedded PC-104 industrial control computer with fast processing and large storage.
3. Precise constant current source with reliable protection circuit.
4. 6-channel high-speed synchronous data sampling.
5. 5.7-inch backlit LCD for clear display in sunlight.
6. Graphic and text display results.
7. T9 input method supporting multiple character inputs.
8. 1G host storage for extensive data storage.
9. External USB disk storage for additional data capacity.
10. USB disk data synchronization for easy data exchange.
11. Tree-shaped storage structure for convenient data query.
12. Built-in panel-type thermal printer.

Technical Parameters
- Output current: ≥1A, 3 channels
- Data sampling: 6 channels, 10kHz/s frequency
- Measuring range: Transition resistance 0.5Ω–20Ω, Transition time ≤250ms
- Resolution: Resistance 0.01Ω, Time 0.1ms
- Measurement precision: Resistance ±(5%+3 digital), Time ±(0.1%+1 digital)
- Storage: U disk and machine storage 1G
- Dimensions: 350mm×230mm×200mm
- Weight: 5kg

Conditions of Use
- Environment temperature: -10℃ to 50℃
- Humidity: ≤85%RH
- Working power supply: AC220V±10%, 50±1Hz frequency