Earth testing

Reliable earth testing for safer electrical installations

Accurately measure earth resistance and ensure the integrity of your electrical installations with our advanced earth testing instruments. Designed for efficiency, accuracy, and durability, our range includes clamp-on testers for quick, stakeless measurements and traditional 2- and 3-point testers for in-depth earth system analysis. With features like true RMS current measurement, noise rejection, and Bluetooth data transfer, these tools help you diagnose earthing issues faster, improve safety, and maintain compliance in demanding environments such as power stations, substations, and industrial sites.

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Accurate and reliable measurements

Ensure compliance and safety with high-precision earth resistance testing. Our instruments provide stable and repeatable results, even in noisy electrical environments, helping you identify potential grounding issues before they become a risk.

Flexible testing methods

From clamp-on stakeless testing for quick assessments to 2- and 3-point testing for detailed analysis, our range covers all major earth testing methods. This allows you to select the best approach based on site conditions and testing requirements.

Built for tough environments

Designed with rugged, weatherproof casings (IP54 rated), our testers are durable and reliable even in challenging outdoor conditions. With simple, intuitive controls, they make earth testing efficient and hassle-free, even with gloves on.

Smart data management

Models like the DET24C include Bluetooth connectivity, enabling you to transfer test data directly to PowerDB software for easy analysis and reporting. This saves time on documentation and ensures a traceable record of all earth resistance tests.

Frequently asked questions

What is earth resistance testing, and why is it important?

Earth resistance testing measures how effectively an electrical system is connected to the earth to safely dissipate fault currents. A
low earth resistance ensures that electrical faults, lightning strikes, or leakage currents do not pose a risk to equipment, structures, or personnel. Regular testing is essential for compliance with safety regulations and to prevent unexpected failures in earthing systems.

What is the difference between clamp-on and 2- or 3-point earth testing?

Clamp-on earth testing (like with the DET14C and DET24C) is a stakeless method used to measure earth resistance without disconnecting the system or driving test stakes. It is ideal for substations, buildings, and industrial sites where conventional testing is impractical.
2- and 3-point earth testing (performed with DET3TC and DET3TD testers) requires test stakes and provides a more comprehensive measurement of the earth resistance by injecting a test current into the ground and measuring voltage drop. This method is used for installing, verifying, and troubleshooting earthing systems in open environments.

How do I know which earth testing method to use?

The choice of method depends on the installation and environment:

Use clamp-on testing if you need a quick, non-intrusive measurement without disconnecting the system.
Use 3-point testing for new installations or when you need a highly accurate measurement of soil resistance and electrode efficiency.
Use 2-point testing for comparative checks when access to only two points is available.

Can these testers be used in noisy electrical environments?

Yes, our testers include built-in noise rejection technology, ensuring stable and accurate readings even in electrically noisy areas like substations and power stations. Models such as the DET3TC and DET3TD can operate in environments with up to 40 V peak-to-peak noise, making them reliable for challenging testing conditions.