UNI-T UT575B Double-Clamp Multifunctional Earth Tester
The UT575B Double-Clamp Multifunctional Earth Tester is a premium portable instrument engineered for accurate on-site measurement of grounding-related parameters. Utilizing advanced digital signal processing, FFT, and AFC technologies, it delivers stable and reliable readings in complex environments. Its double-clamp design allows measurement of grounding resistance without disconnecting existing electrodes, simplifying tests for large or grid-type grounding systems. The device supports multiple methods two-, three-, and four-wire tests, plus selective and double-clamp modes offering versatility across diverse grounding configurations.
A large-diameter current clamp ensures precise detection of ground currents, while its rugged construction with a waterproof, impact-resistant casing rated IP65 guarantees durability in harsh field conditions. Internally, a high-capacity rechargeable lithium battery powers the unit for extended periods, and ergonomic controls with a backlit LCD provide clear visibility and reduce operator fatigue during prolonged use.
Integrated data storage holds up to 2,000 records with timestamps, and both USB and Bluetooth connectivity facilitate seamless transfer and analysis via PC software. A built-in clock enhances data logging accuracy, and audible alarms alert users to out-of-range readings. The UT575B balances precision and practicality, streamlining complex grounding diagnostics into an efficient workflow.
Features:
- Indicator light with unique jack-position design to prevent misconnection.
- 12-position function selector knob clearly indicates different testing modes.
- Waterproof (IP65), impact-resistant, and drop-proof housing for reliable outdoor use.
- High-capacity rechargeable lithium battery pack (7.4 V, 2600 mAh).
- Backlit LCD for easy reading in low-light environments.
- Large-diameter double-clamp current coils for accurate ground current measurement.
- Data storage of up to 2,000 test records with date and time stamps.
- Audible alarm function when measured values exceed preset thresholds.
- Automatic frequency control (AFC) with selectable frequencies (128 Hz, 111 Hz, 105 Hz, 94 Hz) to filter interference.
- USB communication port for straightforward data uploading to PC software.
Specifications:
| Specification | Details |
|---|---|
| Measurement Functions: | – Grounding resistance (AC/DC) via 2-, 3-, and 4-wire methods – Selective (single-clamp) 3 / 4-wire methods – Double-clamp grounding resistance – Soil resistivity (Wenner method) – Grounding current (AC clamp) – Grounding voltage (AC) |
| Measurement Ranges & Accuracies: | – Grounding R (2 / 3 / 4-wire): 0.00 Ω–300.00 kΩ, accuracy ±2 %rdg ±3 dgt (0.01 Ω – 29.99 Ω); ±2 %rdg ±5 dgt (0.00 Ω – 0.99 Ω); higher ranges ±2 %rdg ±3 dgt to ±4 %rdg ±3 dgt – Grounding R (selective): 0.00 Ω–3000 Ω, accuracy ±2 %rdg ±5 dgt to ±2 %rdg ±3 dgt – Grounding R (double-clamp): 0.01 Ω–100 Ω, accuracy ±10 %rdg ±5 dgt to ±2 %rdg ±3 dgt – Soil Resistivity: 0.00 Ω·m–9,000 kΩ·m (dependent on R accuracy) – AC Voltage: 0.0 V–100.0 V, accuracy ±2 %rdg ±3 dgt – AC Current: 0.00 mA–600.0 A, accuracy ±2 %rdg ±3 dgt |
| Test Frequencies: | Automatic Frequency Control (AFC): 128 Hz, 111 Hz, 105 Hz, 94 Hz |
| Short-Circuit Test Current / Open-Circuit Voltage: | – Short-circuit: AC 250 mA max – Open-circuit: AC 40 V max |
| Auxiliary Grounding Resistance Test: | 0.00 kΩ–30.00 kΩ (requires 100 Ω + rC < 50 kΩ, 100 Ω + rP < 50 kΩ) |
| Display: | 4-digit ultra-large LCD (128 mm × 75 mm) with backlight and bar-graph indication |
| Data Storage / Viewing: | – Stores up to 2,000 groups, with date/time stamps – “HOLD” function for data freeze – “READ” mode to scroll through stored records – “CLR” to delete all memory |
| Power Supply / Battery: | – Rechargeable lithium battery: DC 7.4 V, 2600 mAh – Operating voltage: 7.8 V ± 0.6 V – Charging time 2 h; indicator LED red (charging), green (full) – Auto power-off after 15 minutes of inactivity |
| Measurement Time / Cycle: | – AC current / voltage: 2 readings/sec – Ground resistance (double-clamp): 7 s per reading – ≥ 5000 cycles (short-circuit once, rest 30 s, retest) |
| Environmental & Safety Ratings: | – Operating temperature: –10 °C to 40 °C; ≤ 80 % RH – Storage temperature: –20 °C to 60 °C; ≤ 70 % RH – Protection: IP65 (with cover closed) – Overload protection: 280 V rms / 3 s for C(H)–E, P(S)–ES and between terminals – Insulation resistance: > 20 MΩ (500 V DC between circuit and case) – Dielectric withstand: 3700 V rms between circuit and case – Safety: IEC61010-1 CAT III 300 V, CAT IV 150 V, Pollution degree 2; IEC61557-1, IEC61557-5 |
| Physical Dimensions: | – Tester: 280 × 260 × 160 mm (H × W × D) – Current clamp (each): 223 × 120 × 39 mm (H × W × D); clamp diameter φ 70 mm – Tester weight (with battery): ~3490 g – Two current clamps (each ~1100 g), total kit weight ~6800 g (including accessories) |
| Test Leads & Accessories: | – Four test leads: 20 m red/black; 10 m yellow/green – Simple test leads: 1.6 m red/black – Current clamps: two with 2 m leads (red-black plug; blue-black plug) – Auxiliary ground rods: 4 pcs (φ 10 mm × 250 mm each) – USB cable (1.5 m) – Charger (dedicated) |
| Communication / PC Software: | – USB interface for data upload – PC software supports data access, viewing, report generation, printing |
| Other Indicators / Functions: | – Overload (“OL”) indication – Low-battery (“ ”) indication at ~7.2 V ± 0.1 V – Interference detection (“NOISE”) when > 5 V present – Alarm function with adjustable threshold (buzzer “Beep-Beep-Beep”) |
Applications:
- Electric Power Systems.
- Telecommunications.
- Meteorology.
- Oil & Gas Field Operations.
- Architectural & Construction Projects.
- Lightning Protection Installations.
- Industrial Electrical Equipment.
Package Contents:
- 1x Tester
- 1x Carrying Bag
- 4x Auxiliary Grounding Rod
- 4x Test Leads (total of 20 m red, 20 m black, 10 m yellow, 10 m green)
- 2x Simple Test Leads (1.6 m red, 1.6 m black)
- 2x Current Clamps
- 1x USB Cable (with data) (1.5 m)
- 1x Dedicated Charger
- 1x User Manual
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