MI 3288 Earth Insulation Tester

The MI 3288 Earth Insulation Tester is a portable, battery‑powered test instrument with excellent IP protection (IP54) and is designed for high‑altitude operation (300 V CAT III at 4000 m). It is intended for measuring earth resistance, specific earth resistance, earth potential, step and touch voltages, insulation resistance, and continuity of protective conductors on a wide range of energized and non‑energized installations. The tester supports the 4‑wire earth resistance measurement method in combination with one clamp, two‑clamp earth resistance measurement, 4‑wire specific earth resistance measurement, and TRMS current measurement. With its ability to measure earth potential, step and touch voltage, and insulation resistance, it becomes a highly versatile instrument. The device can also test the breakdown voltage of overvoltage protection devices and perform continuity (resistance) measurements in the micro‑ohm range. All measurement results can be saved directly on the instrument and later downloaded to a computer using the Metrel ES Manager PC software for analysis and report generation.