The KDZR-10A Transformer DC Winding Resistance Tester is a portable, battery-powered instrument built around a 32-bit ARM processor, which enables automatic self-calibration, current stabilization, data processing, and resistance display. Weighing only 3kg and housed in a rugged, compact casing (300×175×80mm), it is highly portable for field use. It operates on a high-capacity lithium battery, providing over 3 hours of continuous use and supporting hot-swappable batteries for uninterrupted testing. The 7-inch full-transmissive LCD screen ensures clear visibility even in bright sunlight, while the built-in thermal printer allows for immediate on-site report generation. With data storage options (internal memory and USB drive) and multiple communication interfaces (RS232, USB), it seamlessly integrates with modern data management systems. The instrument also features comprehensive anti-back EMF protection, ensuring operator and equipment safety during testing.

• Portable design with small size and light weight for easy field deployment.
• High-capacity lithium battery with >3 hours of continuous operation and replaceable design.
• 7-inch full-transmissive LCD screen for clear visibility in direct sunlight.
• Built-in embedded thermal printer for on-site data printing.
• Silicone rubber keypad for enhanced tactile feedback and extended durability.
• Comprehensive built-in help documentation including operation guides and wiring diagrams.
• Real-time clock and calendar display with internal and USB data storage capabilities.
• RS232 and USB interfaces for seamless computer data transfer.
• Robust anti-back EMF protection for operator and equipment safety.
• Fast and stable measurements with automatic self-calibration and data processing.
• Single-power supply capability for longitudinal testing of on-load tap changers.
• Suitable for rapid DC resistance measurement of transformers up to 110kV.

• Output current: 10A, 5A, 2A, 1A, 500mA, 200mA, 50mA, 20mA, <5mA.
• Measurement range: 10A: 1mΩ~200mΩ; 5A: 2mΩ~500mΩ; 2A: 5mΩ~2Ω; 1A: 10mΩ~4Ω; 500mA: 100mΩ~10Ω; 200mA: 200mΩ~20Ω; 50mA: 1Ω~100Ω; 20mA: 2Ω~400Ω; <5mA: 10Ω~20kΩ.
• Resolution: 1μΩ.
• Accuracy: ±(0.2% reading + 5 digits) for output currents ≥20mA; ±(0.5% reading + 5 digits) for output current <5mA.
• Dimensions: 300mm × 175mm × 80mm.
• Weight: 3000g.
• Display: 7-inch full-transmissive LCD screen.
• Power supply: Built-in rechargeable lithium battery (≥3 hours operation) with AC220V charging capability.
• Protection: Anti-back EMF protection.
• Storage: Internal memory and USB drive support.
• Interfaces: RS232 and USB.