UNI-T UT278D Ground Pile Clamp Earth Resistance Tester
The UNI-T UT278D presents itself as a thoughtfully engineered solution for technicians who demand rapid, reliable earth-resistance readings without the need for auxiliary rods or disconnecting grounding conductors. At its core is a precision clamp mechanism that captures loop resistance through the grounding system in a single, non-intrusive action. By integrating fast-filtering technology, the UT278D minimizes the influence of stray electromagnetic interference common in industrial environments ensuring that each measurement reflects actual ground integrity rather than spurious noise.
Housed within a robust yet ergonomically balanced casing, the instrument combines a vivid color display and intuitive interface so that results are visible at a glance, even under poor lighting or at awkward angles. Its rechargeable lithium-battery power system supports extended field use, while automatic power-down conserves energy between tests. Multiple safety safeguards including overload protection and reinforced insulation protect both user and device when dealing with voltages up to the CAT-rated limits.
Beyond its core testing capabilities, the UT278D’s built-in data storage and USB-based transfer function allow seamless logging and analysis, eliminating manual transcription errors and simplifying compliance reporting. Whether deployed on utility grids, at telecommunications sites, or for lightning-protection verification, this clamp-style earth tester accelerates diagnostics, enhances safety, and streamlines maintenance workflows all in a single, portable instrument.
Features:
- 2.4-inch color display for clear, high-contrast readouts.
- Clamp-on earth-resistance measurement (loop method).
- Leakage-current measurement to detect stray currents.
- AC/DC current measurement up to its rated range.
- Ground-voltage measurement for on-site verification.
- Audible and visual alarm to flag out-of-tolerance readings.
- USB data-transfer port for easy logging and PC analysis.
- Built-in rechargeable lithium battery with real-time charge-level indicator.
Specifications:
| Category | Specification |
|---|---|
| Display: | 2.4-inch color LCD (46 × 29 mm) |
| Jaw Size: | 68 mm |
| Measurement Rate: | 1 time/sec |
| Power Supply: | Built-in DC 3.7V rechargeable lithium battery |
| Battery Indicator: | Real-time display |
| Auto Power Off: | 15 minutes |
| Data Storage: | 500 sets |
| USB Data Transfer: | Supported |
| Weight: | 975 g (including battery) |
| Operating Temperature: | –10°C to 50°C; <80% RH |
| Storage Temperature: | –10°C to 60°C; <70% RH |
| Insulation Resistance: | >20 MΩ (500V between circuit and case) |
| Withstand Voltage: | AC 3700V RMS (between circuit and case) |
| External Magnetic Field: | <40 A/m |
| External Electric Field: | <1 V/m |
| Safety Standards: | IEC61010-1, IEC61010-031, IEC61557-1 |
| Measurement Categories: | CAT III 300V, CAT IV 150V; Pollution Degree 2 |
| Ground Resistance Range: | 0.00 Ω – 2000 Ω |
| Leakage Current Range: | 0.000 A – 60 A |
| Current Resolution: | 1 µA |
| 3/4-Wire Resistance Range: | 0.00 Ω – 30 KΩ |
| Soil Resistivity Range: | 0.00 Ω – 9999 KΩ |
| Ground Voltage Range: | 0 – 600 V |
| Accuracy Reference Conditions: | 23°C ± 5°C, <75% RH |
Applications:
- Power distribution systems.
- Gas stations.
- Grounding grids.
- Lightning protection systems.
- Telecommunication facilities.
- Electric power infrastructure.
- Meteorological stations.
- Oil fields.
Package Include:
- 1× UT278D Ground Pile Clamp Earth Resistance Tester (main unit)
- 1× Test lead set (pair of insulated leads with banana-plug ends)
- 1× Ground spike (earth rod)
- 1× USB data-transfer cable
- 1× User’s manual
- 1× Calibration certificate / Test report
- 1× Carrying case
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