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USB Milliohm, Earth Bond, Single & 3 Phase Motor Tester

Milliohm, earth bond and motor tester solution, offering resistance testing of all windings on single and 3‑phase electric motors. See accurate results in under a minute. 



USB Milliohm, Earth Bond, Single & 3-Phase Motor Testing kit

Designed to meet the milliohm testing needs of technicians and engineers in a wide range of industries, the MT03A is the ultimate low-resistance milliohm testing tool.

The MT03A features earth bond testing in compliance with UN ECE R100 regulations and a minimum test current of 200 mA. With its single and 3-phase testing capabilities, it can perform tests on a range of equipment, including transmission transformers, distribution transformers, servo motor testing and generator testing.


  • High Precision Measurement: Pico's milliohm testers are engineered for a high level of precision, allowing you to accurately measure low-resistance values with confidence.
  • Fast measurement speed: The MT03A offers resistance testing of all windings on a 3‑phase motor in under a minute.
  • Accuracy & Compensation: the MT03A produces highly accurate results that can automatically compensate for temperature.
  • USB PC Connectivity: the MT03A can be connected to a computer or laptop for data analysis and reporting.

Typical Applications

  • Electric Vehicles (EV)
  • Rail
  • Industrial manufacturing
  • Elevators & escalators
  • HVAC
  • Water treatment
  • Mining & drilling
  • Wind turbines and renewables
  • Scientific research

3-Phase Motor & Winding Resistance Testing

When it comes to ensuring the efficient and reliable performance of 3-phase motors, precision is paramount. Our MT03A Motor and Milliohm Tester Kit is an invaluable tool for professionals engaged in single and 3-phase motor testing, repair, or quality control. The MT03A also acts as a 3-phase winding resistance tester, allowing you to accurately measure single and 3-phase motor resistance, helping you identify potential issues such as winding faults or loose connections.

By utilizing the MT03A's advanced resistance testing capabilities, you can perform comprehensive 3-phase motor resistance testing quickly and efficiently. This enables you to pinpoint problems early, reducing downtime and preventing costly breakdowns. Whether you're working with industrial machinery or electric vehicles, the MT03A kit is an essential asset for any motor testing application.

Earth Bond Testing in Compliance with UN ECE R100 Regulations

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Ensuring the safety and compliance of electrical systems is a top priority, especially when dealing with automotive and transportation applications. Our MT03A Motor and Milliohm Tester Kit goes beyond motor testing, offering a dedicated solution for earth bond testing in accordance with UN ECE R100 regulations.

Our MT03A kit is engineered to help you meet stringent safety standards by accurately measuring earth bond resistance. It ensures that your electrical systems are properly grounded, reducing the risk of electrical hazards and ensuring compliance with international regulations.

Whether you're testing vehicles, charging infrastructure, or other electrical installations, the MT03A's earth bond testing capabilities provide the precision and compliance assurance you need.

Milliohm Testing

For professionals requiring precise milliohm measurements, our MT03A milliohm testing kit offers a versatile solution. The kit allows you to measure circuit resistances with 10 microohms precision. 

Our dedicated Windows PC software application provides a clear user interface that provides simplicity, speed, and complete control over the tester. 

The highly accurate milliohm values can be automatically temperature-compensated, and the MT03A ensures precision and reliability even in varying temperature conditions. The Kelvin clips are also included to minimize contact resistance effects when connecting the measurement unit to the component under test.

In essence, the MT03A Motor and Milliohm Tester Kit caters to a wide range of professionals and industries where precise electrical measurements, single and 3-phase motor testing, and compliance with safety standards are essential for efficient and reliable operations.

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Resistance measurement range Autoranging up to 2 Ω
Resistance resolution 10 µΩ
Resistance accuracy (typical) ±(0.5% + 100 µΩ)
Temperature resolution 0.2 °C (0.36 °F)
Temperature accuracy (typical) ±0.5 °C (0.9 °F)
Input protection ±30 V
Weight <0.5 kg
Dimensions 190 x 141 x 42 mm
Connection USB (4.5 m USB2 cable supplied)
PC requirements Windows 10 or 11 (64-bit application)


Environment Storage Operating Quoted accuracy
Temperature –20 to +60 °C
(–4 to 140 °F)
0 to 40 °C
(32 to 104 °F)
15 to 30 °C
(59 to 86 °F)
Humidity 5 to 95 %RH (non-condensing) 5 to 80 %RH (non-condensing)
Altitude Up to 15 000 m (49 200 ft) Up to 2 000 m (6 560 ft)
Pollution degree 2

Application Video

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