UT278A Clamp Earth Ground Testers

UT278A Clamp Earth Ground Tester

The UT278A Clamp Earth Ground Tester is a professional instrument designed to measure grounding resistance quickly and safely without disconnecting the grounding system. Electricians, engineers, and maintenance technicians use this device to inspect grounding networks in electrical installations. Because the tester uses clamp-on measurement technology, technicians can test grounding systems directly from the earth conductor while the system remains energized.

Moreover, the UT278A Clamp Earth Ground Tester simplifies ground resistance testing by eliminating the need for auxiliary ground rods. Technicians only need to clamp the device around the grounding conductor to obtain accurate readings. As a result, the tester significantly reduces testing time and improves work efficiency in industrial and commercial environments.

In addition, the device measures earth resistance and leakage current simultaneously. This feature allows technicians to detect grounding faults and identify electrical safety issues more effectively. Proper grounding plays an essential role in protecting equipment and personnel, therefore accurate testing becomes critical in power systems and industrial facilities.

Furthermore,  provides stable and reliable performance in complex grounding networks. The tester works well in power distribution systems, telecommunications sites, lightning protection installations, and renewable energy systems. Because of its clamp design, technicians can perform inspections in locations where traditional ground resistance testers cannot operate easily.

Another important advantage of this tester is its large clamp jaw design, which allows measurement of thick grounding cables commonly used in industrial environments. In addition, the device features a clear LCD display with backlight, which improves visibility when technicians work in low-light conditions.

The tester also includes useful functions such as data hold, alarm indication, and automatic measurement range selection. Therefore, technicians can read and record results quickly while performing grounding inspections.

Because of its compact structure and durable design, technicians can carry  easily during field inspections. Many electrical maintenance teams rely on this instrument for routine grounding verification and electrical safety testing.

Key Features

• Clamp-On Ground Resistance Measurement
  Measures grounding resistance without disconnecting the grounding conductor.

• Leakage Current Detection
  Measures leakage current flowing through the grounding system.

• Fast and Accurate Measurement
  Provides stable results in complex grounding networks.

• Large Clamp Jaw Opening
  Allows measurement of thick ground conductors.

• Backlit LCD Display
  Ensures clear readings in dark environments.

• Data Hold Function
  Allows technicians to freeze readings for documentation.

• Automatic Range Selection
  Improves measurement accuracy and convenience.

• Portable and Durable Design
  Suitable for industrial field inspections.

Applications

 is widely used in many electrical safety and maintenance applications, including:

• Grounding system inspection

• Lightning protection system testing

• Power distribution grounding measurement

• Telecommunications tower grounding tests

• Electrical safety inspections

• Industrial plant grounding maintenance

• Renewable energy grounding systems

Technical Specifications (Datasheet)

• Model: UNI-T UT278A

• Product Type: Clamp Earth Ground Tester

• Earth Resistance Measurement Range: 0.01Ω – 1200Ω

• Leakage Current Measurement: 0.00mA – 30A

• Clamp Jaw Diameter: ≈32mm

• Display: LCD with backlight

• Measurement Method: Clamp-on ground loop measurement

• Data Hold: Supported

• Safety Rating: CAT III 300V

• Power Supply: Battery powered