UNI-T UT278C Series Ground Pile Clamp Earth Resistance Tester
The UNI-T UT278C is a portable clamp-style instrument designed to simplify earth resistance testing on grounding rods, ground grids, and similar installations without needing to disconnect conductors. Encased in a rugged, double-insulated housing, the unit features a hinged jaw that opens to 68 mm, easily clamping around grounding electrodes or parallel conductors. Once clamped, the UT278C injects a small test current and measures the resulting voltage drop to calculate ground resistance, displaying results on a bright 2.4-inch color LCD.
The large screen presents readings clearly and enables intuitive menu navigation, even in bright sunlight or dimly lit environments. Internally, the UT278C’s electronics employ fast-filtering algorithms to minimize interference from nearby live cables, ensuring stable values within one second of measurement. A rechargeable lithium battery pack powers the unit, with real-time battery status shown on-screen; recharging is accomplished via a standard USB port when convenient. The instrument can store up to 500 test records, which can later be uploaded to a PC via USB for reporting and analysis.
Weighing just under 1 kg, the tester balances durability and portability: its reinforced insulation and built-in overload protection safeguard both operator and device in harsh field conditions. In practice, the UT278C provides technicians with a fast, non-intrusive way to verify grounding integrity without additional auxiliary rods or circuit interruptions.
Features:
- 2.4-inch color screen.
- Earth resistance measurement.
- Leakage current measurement.
- Current measurement.
- Grounding voltage measurement.
- Alarm function (visual/audible).
- USB data transfer.
- Built-in rechargeable lithium battery.
- Soil resistivity measurement.
Specifications:
| Category | Specification |
|---|---|
| Model: | UNI-T UT278C |
| Display: | 2.4-inch color LCD (46 × 29 mm) |
| Jaw Size: | 68 mm |
| Measurement Rate: | 1 time/second |
| Power Supply: | Built-in DC 3.7V lithium battery |
| Auto Power Off: | 15 minutes |
| USB Data Transfer: | Supported (upload, save, and print) |
| Data Storage: | 500 sets |
| 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 |
| Alarm Function: | Yes |
| Backlight: | Yes |
| Power Consumption: | 750 mA Max |
| Overload Protection: | Yes |
Measurement Ranges:
| Function | Range | Resolution |
|---|---|---|
| Ground Resistance: | 0.00Ω – 2000Ω | — |
| Leakage Current: | 0.000A – 60A | 1 µA |
| 3/4-Wire Resistance: | 0.00Ω – 30KΩ | — |
| Soil Resistivity: | 0.00Ω – 9999KΩ | — |
| Grounding Voltage: | 0 – 600V | — |
Applications:
- Power Distribution Systems.
- Lightning Protection Systems.
- Industrial Equipment.
- Telecommunication Infrastructure.
- Building and Facility Maintenance.
- Soil Resistivity Testing.
- Field Troubleshooting and Commissioning.
Package Include:
- 1× UT278C Ground Pile Clamp Earth Resistance Tester (main unit)
- 1× Test lead set (pair of insulated leads with banana plugs)
- 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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