The MS‑D120A Transformer DC Resistance Tester is essential test equipment for power transformer factory inspection, site installation‑handover and preventive maintenance. It accurately measures winding DC resistance to detect manufacturing defects such as poor welding, loose connections, broken strands and hidden operational risks of power transformers.

Equipped with a 7‑inch industrial true‑color touch‑screen combined with jog‑dial operation, this unit delivers fast, stable and high‑precision resistance measurement for on‑site substation and transformer‑manufacturing‑plant jobs.

Applications

– Factory test for semi‑finished & finished power transformers

– Transformer site commissioning & hand‑over test

– Preventive maintenance for in‑service transformers

– Test for reactors, inductive windings and other resistive components

Key Features

1. Multi‑level test current: 20A,10A,5A,1A,0.2A,10mA,＜1 mA selectable output current, measurement range up to 25 kΩ, covers most transformer testing requirements.

2. Resistance change‑rate monitoring: Automatically calculates resistance change rate at 5s,15s,30s, helping technicians judge data stability and avoid misreading test results.

3. Complete multiple safety protections: Back‑EMF protection, wire‑break protection, power‑failure protection, improving safety during inductive winding measurement.

4. Powerful data management: Built‑in thermal printer; stores maximum 200 sets test records locally, supports bulk data export via USB flash drive.

5. Temperature conversion function: Supports copper / aluminum winding material selection, converts measured resistance value to target temperature for convenient data comparison.

6. Dual‑mode operation: 7‑inch industrial true‑color touch‑screen plus jog dial, flexible operation for harsh field conditions.

Technical Specifications

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