UNI-T UT278A+ Clamp Earth Ground Tester 0.01–1200Ω, 20A Leakage Current, Ω+A Display
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The UNI-T UT278A+ is a clamp earth ground tester that measures earth (loop) resistance from 0.01Ω to 1200Ω and leakage current up to 20A – without disconnecting the earth conductor and without driving auxiliary stakes. Simply clamp the jaw around the earth rod or down-conductor and read resistance and current together on one screen. With 0.001Ω resolution, a 32 mm jaw, alarm limits and 300-record memory, it is built for M&E contractors, utility and telecom teams, and facility maintenance crews doing routine earthing checks.
Key Features & Benefits
- No stakes, no disconnection – mutual-induction measurement tests multi-point earthing systems while they stay connected and in service.
- Resistance + current on one screen (Ω+A) – the MODE key switches between resistance only and simultaneous resistance and leakage current, a feature unique to the UT278A+ in the UT270+ series.
- Wide, fine range – 0.01–1200Ω with 0.001Ω resolution; leakage current from 0mA to 20A with 0.01mA resolution.
- Resistance limit alarm – set a threshold up to 200Ω; the tester flashes and beeps when a reading exceeds it, ideal for pass/fail checks across many earth pits.
- Interference recognition – a NOISE warning flashes and beeps when large interference current in the loop could affect accuracy.
- 300-record memory – store readings with HOLD, then review them on-site with data recall (MR).
- Auto calibration at power-on – self-calibrates on start-up; a supplied 1Ω / 10Ω calibration loop lets you verify the tester in the field.
- Clear EBTN display – 4-digit 47 x 28.5 mm black-screen LCD with backlight, data hold, low-battery indication and over-range (OL) display.
- Field-ready – double-insulated housing that resists environmental interference; runs on 4 x 1.5V AA batteries with 5-minute auto power-off.
Technical Specifications
| Specification | Value |
|---|---|
| Brand | UNI-T |
| Model | UT278A+ |
| Functions | Earth (ground) resistance, loop resistance, leakage current |
| Earth resistance range | 0.01–1200Ω |
| Resistance resolution | 0.001Ω (lowest range) |
| Leakage current range | 0mA–20A |
| Current resolution | 0.01mA (lowest range) |
| Measurement method | Mutual induction (clamp-on, no auxiliary electrodes) |
| Measuring rate | 2 times per second |
| Jaw opening | 32 mm (jaw aperture 55 x 32 mm) |
| Display | 4-digit EBTN LCD, 47 x 28.5 mm, backlight, Ω+A simultaneous display |
| Data storage | 300 records, with data recall |
| Alarm | Visual and audible; resistance alarm limit up to 200Ω |
| Other features | Auto range, data hold, jamming (noise) signal recognition, over-range display, low-battery indication, auto calibration |
| Auto power-off | After 5 minutes (can be extended) |
| Power | 4 x 1.5V AA (LR6) alkaline batteries (6V DC); 50mA max consumption |
| Operating environment | -10–40°C, below 80% RH |
| Insulation resistance | Above 20MΩ (500V between circuit and case) |
| Withstand voltage | AC 3700V rms (between circuit and case) |
| Dimensions | 285 x 85 x 56 mm |
| Weight | 1.18 kg (including batteries) |
Earth Resistance Accuracy – ±(% of reading + Ω)
| Range | Accuracy |
|---|---|
| 0.01–0.099Ω | ±(1%+0.01) |
| 0.1–0.99Ω | ±(1%+0.01) |
| 1–49.9Ω | ±(1%+0.1) |
| 50–99.5Ω | ±(1.5%+0.5) |
| 100–199Ω | ±(2%+1) |
| 200–395Ω | ±(5%+5) |
| 400–590Ω | ±(10%+10) |
| 600–800Ω | ±(20%+20) |
| 800–1200Ω | ±(25%+30) |
Leakage Current Accuracy
| Range | Accuracy |
|---|---|
| 0–9mA | ±(2.5%+1mA) |
| 10–99mA | ±(2.5%+5mA) |
| 100–299mA | ±(2.5%+10mA) |
| 0.3–2.99A | ±(2.5%+0.1A) |
| 3–9.9A | ±(2.5%+0.3A) |
| 10–20A | ±(2.5%+0.5A) |
Safety & Compliance
- IEC 61010-1: CAT III 300V, CAT IV 150V, pollution degree 2
- IEC 61010-031
- CE and UKCA certified
- Double insulation design
What's in the Box
- 1 x UNI-T UT278A+ clamp earth ground tester
- 1 x calibration loop (test ring), 1Ω and 10Ω
- 4 x 1.5V AA (LR6) batteries
- 1 x carrying tool box
- 1 x English user manual
Applications
- Earth resistance checks on lightning protection down-conductors and earth pits
- Electricity transmission and distribution tower earthing
- Telecommunication towers, cable shielding and base-station earthing
- Building, factory and data-centre (computer room) earthing systems
- Oil fields, petrochemical plants and industrial power installations
- Leakage current checks on earth conductors during M&E installation and maintenance
- Single-point earths using the two-point or three-point method with a test lead (see user manual)
UNI-T Clamp Earth Tester Comparison
| Feature | UT275 | UT276A+ | UT278A+ |
|---|---|---|---|
| Earth resistance | 0.01–1000Ω | 0.01–590Ω | 0.01–1200Ω |
| Leakage current | Up to 30A | – | Up to 20A |
| Ω+A simultaneous display | – | – | Yes |
| Jaw opening | 28 mm | 32 mm | 32 mm |
| Display | 10000-count LCD | 4-digit EBTN | 4-digit EBTN |
| Data storage | 30 | 300 | 300 |
| Visual & audible alarm | – | Yes | Yes |
| Jamming signal recognition | – | Yes | Yes |
| Weight | 1.32 kg | 1.18 kg | 1.18 kg |
Also see the Kyoritsu 4202 digital earth clamp tester.
Why Buy from Techno Tools
- 100% genuine UNI-T stock with local warranty support
- Official tax invoice for business purchases
- Fast delivery across Malaysia; same-day delivery in the Klang Valley for orders before 4:00 PM
| Warranty period | 1 Year Warranty |
|---|---|
| Coverage | Free repair or replacement for defects in material and workmanship arising during normal use within 1 year from the date of purchase. |
| Not covered | Fuses, batteries, test leads and accessories; damage from accident, dropping, overload, misuse, or use outside the instrument's rated specifications. |
| Warranty void if | The instrument has been opened, repaired or modified by a party not authorised by UNI-T or its Malaysian distributor. |
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