Product Introduction
The Handheld Transformer DC Winding Resistance Tester is designed for fast, accurate measurements of both inductive loads (transformers, CT/PT, reactors) and resistive loads (copper bars, cables, switch contacts). Built on a microcontroller platform, it automates self-testing, data processing, and printing to deliver stable readings in seconds. Its compact, one-handed design and ±0.2% accuracy make it an essential tool for installation, commissioning, and preventive maintenance in substation and manufacturing environments.
Product Features
Handheld And Lightweight
Compact body fits easily in one hand, making it highly portable for any job site.
6-level Output Current
Choose from 5mA, 100mA, 300mA, 1A, 10A, or Auto. The 10A max output covers most distribution and power transformers.
Color Lcd And Built-in Battery
Features a clear display with data storage and temperature conversion. The rechargeable lithium battery provides extended testing time without needing an external power source.
Comprehensive Protection
Back EMF protection, broken-lead detection, and overheat alarms safeguard both the operator and the equipment.
Product Parameter
| Parameter | Specification |
|---|---|
| Model | JH2011 |
| Test Current | 5mA, 100mA, 300mA, 1A, 10A, Auto |
| Measurement Range | 0 - 20kΩ |
| Accuracy | ±(0.2% Reading + 0.05% Full Scale) |
| Minimum Resolution | 1μΩ |
| Display | Large Screen Color LCD |
| Power Supply | Built-in 12.6V / 7.8AH Lithium Battery |
| Key Functions | Auto-current Selection, Data Storage, Temperature Conversion, Back EMF Protection |
Applications
- Winding resistance measurement for power transformers, distribution transformers, and instrument transformers (CT/PT)
- Reactor and generator winding resistance testing
- Copper bar, cable, and connector resistance checks
- Contact resistance testing for circuit breakers, contactors, relays, and switchgear
- Routine maintenance, factory acceptance tests, and commissioning work in substation and plant environments
Standard Accessories List
1.Red and black heavy-duty test leads with alligator clips
2.Red and black test leads with 4-wire measurement probes
3.AC power cord
4.DC charging cable
5.Power adapter (battery charger)
Why Choose Us
Over a Decade of Manufacturing Expertise
Established in 2013 and located in Wuhan Optics Valley, we have over 13 years of experience specializing in power safety testing equipment. From R&D to production, we ensure every device meets the rigorous demands of industrial power systems, railroads, and petrochemical industries.
Certified Quality & Reliability
Quality is our core principle. Our products are backed by comprehensive certifications including CE, ISO, CNAS, and RoHS. We strictly adhere to international standards to guarantee that our Insulation and Transformer Resistance Testers perform safely and accurately in the field.
Direct Factory Supply & Customization
As a direct manufacturer, we offer competitive pricing without compromising quality. Our state-of-the-art facility allows us to control the entire production process, ensuring steady business growth and the ability to meet specific customer requirements efficiently.
Global Logistics & Fast Delivery
We understand that time is money. With flexible shipping options via DHL, FedEx, UPS, or Sea Freight, we ensure your equipment arrives safely and on time. Whether you need a quick sample via air (7-12 days) or a bulk order via sea, we have a reliable solution for you.
FAQ
Q: What is the acceptable value for transformer winding resistance?
A: The standard reference is always the transformer's nameplate or technical manual. However, general industry standards suggest:
- Deviation: The measured value should be within ±1% of the factory-rated value.
- Unbalance: The resistance unbalance rate between three phases should not exceed 2%.
The JH2011's high precision (±0.2%) ensures you can reliably judge these critical tolerances.
Q: How can I identify a faulty transformer using the JH2011?
A: You can diagnose potential faults by analyzing the resistance data:
- Open Circuit: If the reading is infinite (OL), the winding is broken.
- Short Circuit: If resistance is significantly lower than the nameplate value, it indicates a short (e.g., turn-to-turn).
- Phase Unbalance: If the difference between phases exceeds 2%, a specific winding may be faulty.
- Trend Analysis: Use the JH2011's Data Storage function to compare current readings with historical data. A sudden change often signals a developing fault.
Q: What is the measurement principle of this tester?
A: The JH2011 uses the DC Voltage Drop Method. It injects a stable DC current (up to 10A) into the winding, measures the voltage drop, and calculates resistance via Ohm's Law (R=V/IR=V/I). This method is specifically designed to provide fast and stable measurements for highly inductive loads like power transformers.
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