UNI-T UT275 Clamp Earth Ground Tester
The UNI‑T UT275 is a clamp‑on earth ground tester designed to simplify and accelerate the measurement of grounding systems in a wide variety of electrical installations. Unlike traditional ground resistance testers that require disconnection of grounding conductors and auxiliary stakes, the UT275’s hinged jaw allows technicians to slip the meter around a grounding conductor or rod and obtain a reading instantly, without interrupting service or compromising safety. Internally, the instrument generates a small test current through the conductor under test and measures the resulting voltage drop; from this it computes ground resistance with a resolution down to 0.001 Ω, making it sensitive enough to detect even minor degradations in grounding integrity.
Ergonomically, the UT275 balances ruggedness and convenience. Its jaws open wide enough to encompass conductors up to 32 mm in diameter, while the double‑insulated housing provides both impact resistance for field use and protection against electrical hazards up to CAT III 300 V. The rotary selection knob and large four‑digit LCD ensure that readings are not only easy to select but also unambiguous under varying light conditions, thanks to an integrated backlight. All essential information resistance value, measurement range, status indicators, and low‑battery warning is presented simultaneously, thereby reducing the need for mode switching or additional manual verification.
In addition to earth resistance measurement, the UT275 can measure leakage currents up to 30 A, enabling comprehensive diagnostics of both grounding and insulation faults in a single tool. Its auto‑range and auto‑calibration functions further streamline the process: the meter adapts instantly to the detected signal level and self‑adjusts its zero point to maintain accuracy over time and temperature. Data hold and recall functions allow the operator to capture transient events or review past readings without returning directly to the test point.
Built for portability, the UT275 weighs just over 1.3 kg and is powered by four standard 1.5 V batteries, giving it several hours of continuous use. Whether servicing industrial substations, verifying the safety of building grounding networks, or troubleshooting stray currents, the UT275 offers a swift, non‑invasive, and reliable solution to earth ground testing.
Features:
- Auto‑range for seamless switching to the optimal measurement range without manual intervention.
- Data hold to freeze a displayed reading for easier recording in tight or hard‑to‑reach locations.
- Data recall allowing previously captured readings to be reviewed on the instrument.
- LCD backlight to ensure clear visibility of measurements even in low‑light environments.
- Resistance‑limit alarm that provides an audible and/or visual indication when a preset resistance threshold is exceeded.
- Low‑battery indication to alert the user when battery replacement is needed, avoiding unexpected power loss.
- Auto‑calibration which continually zeroes the instrument to maintain accuracy over varying temperature and time.
General Specifications:
| Characteristic |
Value |
| Jaw opening: |
32 mm maximum conductor diameter |
| Display: |
4‑digit, 10,000‑count LCD with backlight |
| Safety rating: |
CAT III 300 V |
| Power: |
Four × 1.5 V (LR6) batteries |
| Dimensions (L × W × H): |
293 × 90 × 66 mm |
| Weight: |
1.32 kg (including batteries) |
Earth‑Ground Resistance Measurement:
| Range (Ω) |
Accuracy |
| 0.01 – 0.099 |
±(1 % + 0.01 Ω) |
| 0.1 – 0.99 |
±(1 % + 0.01 Ω) |
| 1 – 49.9 |
±(1 % + 0.01 Ω) |
| 50 – 99.5 |
±(1 % + 0.01 Ω) |
| 100 – 199 |
±(1 % + 0.01 Ω) |
| 200 – 395 |
±(1 % + 0.1 Ω) |
| 400 – 590 |
±(1 % + 0.1 Ω) |
| 600 – 800 |
±(1.5 % + 0.5 Ω) |
| 801 – 1000 |
±(1.5 % + 0.5 Ω) |
| 1001 – 1200 |
±(2 % + 1 Ω) |
Leakage‑Current Measurement:
| Range |
Accuracy |
| 0 mA – 9 mA |
±(2.5 % + 1 mA) |
| 10 mA – 99 mA |
±(2.5 % + 5 mA) |
| 100 mA – 299 mA |
±(2.5 % + 10 mA) |
| 0.3 A – 2.99 A |
±(2.5 % + 0.1 A) |
| 3 A – 9.9 A |
±(2.5 % + 0.3 A) |
| 10 A – 20 A |
±(2.5 % + 0.5 A) |
| 3 A – 30 A |
±(2.5 % + 2 mA) |
Applications:
- Electrical Installations.
- Lightning Protection Systems.
- Industrial Equipment.
- Maintenance and Inspection.
- Telecommunication.
- Meteorology.
- Oil Fields.
- Building and Construction.
Package Include:
- 1x UT275 Clamp Earth Ground Tester
- 4x 1.5 V LR6 (AA) batteries
- 1x Test ring
- 1x English user manual
- 1x Gift box
- 1x Tool box
UNI-T UT275 Documents:
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