MS-100BTransformer ratio tester

The DC resistance of a transformer is a mandatory test item in the manufacturing process of semi-finished and finished transformers, as well as during factory acceptance testing, installation, commissioning tests, and preventive maintenance tests conducted by power companies.  It can effectively detect manufacturing defects such as material selection issues, welding problems, loose connections, missing strands, and broken wires in transformer windings, as well as potential problems that may arise during operation.
The transformer DC resistance tester is an innovative product with a built-in high-capacity lithium battery, making it compact and portable. It is suitable not only for measuring inductive samples such as transformers, current transformers, and reactors, but also for measuring resistive samples such as copper bars, wires, and switch contacts. The instrument offers fast testing speed and high accuracy.

1. Adaptive power supply via lithium battery or 220V AC power. A single charge allows for continuous DC resistance testing of hundreds of transformers, making the testing process simple and convenient.
2. Six output current ranges, with a maximum output of 10A and a maximum output voltage of 25V. Automatic current selection is available for convenience and speed.
3. Wide measurement range and high accuracy: 500uΩ～50KΩ.
4. Features resistance temperature conversion function.
5. Multiple protection functions including back EMF protection, open circuit protection, power failure protection, and overheating alarm.
6. 5.6-inch large industrial-grade high-brightness color LCD screen, ensuring clear visibility even in strong sunlight.
7. Equipped with an external printer for easy data printing.
8. Features both internal and USB flash drive storage. 1. Current Range and Measurement Range
① 10A: 500uΩ ~ 200mΩ
② 5A: 10mΩ ~ 1Ω
③ 1A: 100mΩ ~ 20Ω
④ 100mA: 10Ω ~ 200Ω
⑤ 10mA: 50Ω ~ 2kΩ
⑥ 1mA: 500Ω ~ 50kΩ
2. Accuracy: ±(Reading x 0.2% + 2 digits)  Maximum Resolution: 0.1uΩ
3. Operating Conditions and Dimensions: Power Supply: Built-in lithium battery or external charger, charger input 100~240VAC, 50Hz/60Hz
4. Charging Voltage: 16.8V
5. Charging Time: Approximately 4 hours
6. Main Unit Weight: 3.6kg (excluding test leads)
7. Operating Temperature: -10℃～50℃
8. Charging Current: <2A
9. Operating Time: >8 hours
10. Main Unit Dimensions: 325mm (Length) x 225mm (Width) x 125mm (Height)
11. Relative Humidity: <90%, non-condensing