ERT15C / ERT20C+ — Clamp Earth Testers
Measure earth resistance without auxiliary rods and capture leakage current—ideal for substations, towers and lightning protection loops.
Clamp earth testLeakage currentLarge jaw
Clamp-based earth testing
Measure earth resistance without disconnecting the ground system.
Leakage current
Capture ground leakage current for diagnostics and compliance checks.
Large jaw opening
Wide clamp mouth for busbars and multi-conductor bundles.
Backlit display & memory
High-contrast display with data hold; model-dependent logging.
Key Features
Applications
Substations, lightning protection loops, telecom towers, PV arrays, industrial plants.
Safety
CAT rating per datasheet; jaw insulation and over-range indication.
Convenience
Auto range; audible/visual alarm thresholds; min/max/avg capture.
Connectivity
Model-dependent logging/PC functions. See datasheet for details.
Models & Headline Specs
| Model | Earth resistance | Resolution | Accuracy | Leakage current | Jaw size |
|---|---|---|---|---|---|
| ERT15C | 0.01 Ω – 200 Ω | 0.001 Ω | ±(1% + 0.01 Ω) | — | Ø32 mm |
| ERT20C+ | 0.01 Ω – 1200 Ω | 0.001 Ω | ±(1% + 0.01 Ω) | 0.00 mA – 20.0 A (0.05 mA res., ±2.5% ±1 mA) | 65 mm × 32 mm |
Alarm threshold: 1–199 Ω; Frequency for resistance test: >1 kHz; Double insulation; External magnetic field immunity <40 A/m and electric field <1 V/m. Power: 4×AA (LR6). Memory: 99 sets (20C/20C+). RS232 & software on 20C+ only.
What’s in the box
Clamp meter
ERT15 or ERT20C+ main unit
Carry case
Protective soft case or hard case (model dependent)
Batteries
AA/AAA set (per datasheet)
Certificate
Factory test report
Manual
Quick start / user manual
Where ERT15C / ERT20C+ Excel
Power distribution
Ground loops, poles and substations.
Lightning protection
Verify electrode continuity on buildings & towers.
Telecom & PV
Check bonding quality on towers and arrays.
Industrial facilities
Maintenance rounds; quick checks without downtime.
Downloads & Resources
Datasheet
ERT15C / ERT20C+
Full specifications and safety information.
User manual
ERT Series
Operation & basic instructions.