DC Resistance Tester

Transformer DC resistance testing is a mandatory procedure in multiple scenarios, including factory tests on semi-finished and finished products, installation, overhaul, tap changer modification, commissioning, and preventative maintenance within the power sector. This test verifies the welding quality of winding connections, detects inter-turn short circuits, checks the contact integrity at each position of the tap changer, confirms alignment between actual and indicated tap positions, and identifies issues such as broken leads or broken strands in multi-wire conductors.

To meet the demand for rapid transformer DC resistance measurement, our company has developed the SMRR10A DC Resistance Tester. Utilizing advanced power supply technology, the instrument is compact, lightweight, and delivers high output current. It offers excellent repeatability, strong anti-interference capability, and comprehensive protection features. Controlled by a high-speed microcontroller, the unit is highly automated and includes automatic discharge with an alarm function. It ensures high testing accuracy, is easy to operate, and achieves fast measurement of transformer DC resistance.

1.Remote Control via Mobile Devices – The instrument can be fully controlled through an Android smartphone or tablet. By following our WeChat official account and downloading the dedicated APP, users can operate the device remotely. Test data can be stored and uploaded for easy retrieval.

2.24V Output for High Resistance Testing – A 24V output enables the selection of larger test currents for high-resistance measurements, significantly improving testing speed.

3.Advanced Power Supply & Auto-Ranging – Featuring new power supply technology, the tester provides multiple current ranges and a wide measurement span. It automatically selects the optimal test current based on the load, making it suitable for DC resistance measurement of small/medium transformers and voltage transformers.

4.Comprehensive Protection System – Includes protection against back-EMF surges, open-circuit and power failure during testing, and power overheat. The system reliably safeguards the instrument and operator, with simultaneous audible alarms for faults.

5.Flexible Temperature Conversion – Allows arbitrary temperature conversion for both copper and aluminum windings. Users can manually input any winding temperature for accurate conversion.

6.Intelligent Power Management – Employs smart power management to ensure the instrument consistently operates at low power consumption, effectively saving energy and reducing heat generation.

7.High-Resolution Touchscreen Interface – Equipped with a 7-inch high-brightness color LCD touchscreen that remains clearly visible even in strong light. It supports full touch operation and allows free switching between Chinese and English language interfaces.

8.Data Storage & Recall – Includes a built-in perpetual calendar clock and power-off memory capable of storing up to 1000 test data sets for easy review.

9.Versatile Communication Interfaces – Features Bluetooth, RS232, and USB ports for computer communication and data transfer via USB flash drives.

10.Built-in Printing – Comes with a panel-mounted mini printer capable of printing measurement results in Chinese.

Increasing Equipment Maintenance Effectiveness: Quick sensor readings will minimize equipment downtime, thereby ensuring that the power grid and associated systems operate safely and reliably.

Decreasing Responsible Decisions for Operational Management: The ability to collect high-accuracy diagnostics associated with the condition of the equipment allows for an accurate evaluation of the maintenance needs to be determined. This reduces the risk of erroneous decisions during operations.

Enhanced Ease of Operation: Technical personnel will have the ability to fully utilize their time working with advanced intelligent technology and integrated information systems rather than being required to perform multiple manual procedures repetitively.

Guaranteed Return on Investment: Robust construction, durable design, and comprehensive after-sales service ensure the instrument's long-term, stable performance, delivering excellent value.

Before testing, ensure the Device Under Test (DUT) is completely powered off and fully discharged.

During testing, do not touch any live parts of the DUT or the metal ends of the test leads.

After testing, the instrument will automatically discharge the stored energy from the tested equipment. For maximum safety, please wait until the discharge cycle is complete and a "Safe to Disconnect" message is displayed before handling the connections.

We offer online support via phone, email, and live chat for queries related to how products work, what their specs are, and how much they cost. In addition to providing answers to inquiries about our products, we create solutions for customers based on their specific needs. We provide remote diagnosis, guidance, and technical assistance for troubleshooting issues.

We provide the best products that meet market demand, respond quickly when projects need immediate attention, and provide quality, courteous customer service.

Our product portfolio comprehensively covers six key areas of power systems: