Industry-leading Testing and Measurements Solutions

The Armada ERT100 Earth Ground Resistance Tester is a professional instrument for measuring the resistance of 2-wire electrical equipment safety grounds. Its large display and simple controls make it easy to verify the lightning safety earth connection on new or existing control systems.

A good earth ground is the first line of defense against lightning and power surges. In 2-wire irrigation and control systems, a poor ground connection can leave decoders, controllers, and other equipment exposed to damage. Verifying ground resistance during installation, and checking it again over time, protects the system and the investment behind it.

The ERT100 offers both two-pole and three-pole earth resistance test modes, so you can choose the method that suits the site. It measures earth resistance from 0 to 4,000 ohms using a constant-current 800 Hz signal of about 3 mA. A built-in earth voltage safety check helps confirm conditions before you test.