- Large measurement range: 1,500 Ω / 500 µH / 40A
- Alarms on Ω, A and V
- Automatic Pre-Hold mode when the clamp is opened
- 300 storage locations
- Real-time clock for time/date-stamping of measurements
- Automatic calibration of jaw opening distance at start-up
- Buzzer and automatic power-off
 Datasheet |
- Large measurement range: 1,500 Ω / 500 µH / 40A
- Alarms on Ω, A and V
- Automatic Pre-Hold mode when the clamp is opened
- 2,000 storage locations
- Real-time clock for time/date-stamping of measurements
- Automatic calibration of jaw opening distance at start-up
- Buzzer and automatic power-off
- Bluetooth communication interface
- GTC data transfer software
| Datasheet |
- Wide measurement range from 0.010 Ω to 1200 Ω
- Current from 0.5 mA to 20 A
- Alarms configurable for Ω and A
- Automatic Pre-Hold mode when the clamp is opened
- 300 time/date-stamped measurements
- Automatic calibration of the jaw gap at power-up
- Buzzer and automatic power-off
| Datasheet |
T2000 is a professional clamps specially developed to evaluate resistance of earth rods with no need to disconnect any part of the system (STAKELESS METHOD)
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Datasheet
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T2100 is a professional clamp specially developed to evaluate resistance of earth rods with no need to disconnect any part of the system.
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Datasheet
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Ground-Clamp Earth Resistance Testers
Ground-clamp testers are specialised clamp-type instruments designed to accurately determine earth-loop impedances in grounding systems, lightning protection and foundation earthing without the need for conventional earth rods. They facilitate fast and safe measurement of the grounding loop, fault currents and touch voltages.
FAQ
What is a ground-clamp tester?
A ground-clamp tester is a clamp-on device that is placed around an earthing conductor or loop and measures impedance, fault current or resistance of the earthing connection.
Which parameters can be measured?
Typical parameters include loop impedance (Ω), fault current (mA or A), touch voltage (V) and potentially inductance or leakage currents.
What advantages do clamp-on earth testers offer compared to traditional rod-based methods?
They permit measurement without interruption of the earth system, without auxiliary earth spikes, are mobile and quicker especially in confined or complex installations.
What are common application areas?
Applications include power supply networks, transformer stations, industrial plants, lightning protection systems, foundation earthing measurement, mesh earthing and power distribution inspections.
What selection criteria should be considered?
Important criteria include measurement range (Ω scale), maximum fault current rating, clamp opening size, safety/measurement category (e.g., CAT IV), data memory and interfaces, portability and ruggedness.
How is the measurement process carried out?
The clamp is placed around the earthing conductor or loop, fully closed and set to the correct mode. The device then performs an automatic test, and the value is read and recorded.
What are common error sources during measurement?
Errors can arise from incomplete closure, twisted conductor loops, parallel earthing paths, high inductance, missing calibration or incorrect settings.
How is data logging and documentation supported?
Many instruments include built-in memory, timestamping, USB or Bluetooth export and dedicated software for report generation and measurement tracking.
How frequently should clamp-on earth testers be calibrated or inspected?
Calibration depends on manufacturer specifications, use conditions and applicable standards. Visual inspection and function tests should be performed before each use.
Which standards and regulations apply?
Grounding and lightning protection testing is subject to standards such as EN 61557-5, IEC/EN 60364, VDE 0100, VDE 0105 and other earthing safety regulations.