UNI-T UT276A+ Clamp Earth Ground Testers
The UNI-T UT276A+ is a handheld clamp-style instrument crafted to simplify earth ground testing by allowing measurements without disconnecting grounding conductors. Its slim, ergonomically curved housing shelters a robust jaw mechanism that gently opens around grounding conductors up to 32 mm in diameter. Once clamped, the tool injects a small, safe test current into the grounding system and senses the resulting voltage drop to calculate resistance providing instant feedback via its clear four-digit LCD.
The body of the UT276A+ is molded from impact-resistant polymer, ensuring durability in challenging work environments, while a textured grip area helps the operator maintain control, even when wearing gloves. A single rotary switch on the front panel lets the technician select the desired measurement mode, and large, raised buttons allow one-handed operation when quick readings are needed in tight spaces. Internally, dual-insulation construction isolates the user from live components, and built-in circuitry minimizes interference from nearby electrical noise. On-board electronics automatically adjust range and display stability, so readings settle rapidly without manual intervention.
The overall design compact, under 300 mm long and just over 1 kg strikes a balance between portability and ruggedness. In practice, the UT276A+ delivers reliable ground resistance data in seconds, making it an ideal companion for professionals who need fast, non-intrusive diagnostics of grounding networks.
Features:
- Auto range.
- Data hold.
- Data recall.
- LCD backlight.
- Resistance limit alarm.
- Low battery indication.
- Auto calibration.
Specifications:
| Category |
Specification |
| Earth Ground Resistance |
Ranges: 0.01–0.099 Ω
0.1–0.99 Ω
1–49.9 Ω
50–99.5 Ω
100–199 Ω
200–395 Ω
400–590 Ω
600–800 Ω |
|
Accuracy: 0.01–49.9 Ω: ±(1% + 0.01 Ω)
50–99.5 Ω: ±(1.5% + 0.5 Ω)
100–199 Ω: ±(2% + 1 Ω)
200–395 Ω: ±(5% + 5 Ω)
400–590 Ω: ±(10% + 10 Ω)
600–800 Ω: ±(20% + 20 Ω) |
| Leakage Current |
Ranges: 0–299 mA
0.3–2.99 A
3–9.9 A
10–20 A |
|
Accuracy: 0–9 mA: ±(2.5% + 1 mA)
10–99 mA: ±(2.5% + 5 mA)
100–299 mA: ±(2.5% + 10 mA)
0.3–2.99 A: ±(2.5% + 0.1 A)
3–9.9 A: ±(2.5% + 0.3 A)
10–20 A: ±(2.5% + 0.5 A) |
| Display |
4-digit, 10,000-count LCD (Ω + A display) |
| Jaw Opening |
32 mm |
| Auto Range |
Yes |
| Over-Range Indication |
“OL” displayed when measurement exceeds range |
| Safety Rating |
CAT III 300 V |
| Insulation |
Double-insulated housing |
| Certifications |
CE, UKCA |
| Jamming Signal Recognition |
Yes (automatically detects and suppresses interference) |
| Visual/Audible Alarm |
Yes (alerts when resistance exceeds preset limit) |
| Data Hold |
Yes (freezes current reading) |
| Data Recall |
Yes (stores up to 300 readings) |
| Resistance Limit Alarm |
Yes (user-settable threshold) |
| Auto Power Off |
Yes (conserves battery during inactivity) |
| Auto Calibration |
Yes (periodic self-calibration) |
| Low Battery Indicator |
Yes (“BAT” icon shown on display) |
| Power Supply |
4 × 1.5 V LR6 (AA) batteries |
| Dimensions |
285 × 85 × 56 mm |
| Net Weight |
1.18 kg |
Applications:
- Electrical Power Systems.
- Lightning Protection Systems.
- Telecommunications.
- Industrial Facilities.
- Building Installations.
- Railway and Transportation Systems.
- Maintenance and Troubleshooting.
Package Include:
- 4x 1.5 V batteries (LR6)
- 1x Test ring (47 × 28.5 mm)
- 1x English instruction manual
UNI-T UT276A+ Documents:
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