MI 3288 Earth Insulation Tester

Earth testers

MI 3288 Earth Insulation tester is a portable, battery powered test instrument with excellent IP protection (IP 54) and designed for high altitude (300 V CAT III at 4000 m), intended for measurement of earth resistance, specific earth resistance, earth potential, step and touch voltages, insulation resistance and continuity of protection conductors of various energetic and non-energetic objects. Tester enables 4-wire earth resistance measuring method in combination with one clamp, two clamps earth resistance measurement, 4-wire specific earth resistance measurement and TRMS current measurement. With the option to measure earth potential, step and touch voltage as well as insulation resistance it becomes a very universal tester. Besides the breakdown voltage of overvoltage protection devices and resistance (continuity) measurements in micro-Ω range can be checked by the instrument. All the results can be saved on the instrument and then downloaded with the help of the PC software Metrel ES Manager to the computer for evaluation and report generation after testing.

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Measuring functions

  • Earth Resistance 2/3/4 - pole;
  • Selective Earth Resistance (1 x clamp);
  • Specific Earth Resistance Ro Wenner and Schlumberger method;
  • Earth Resistance with 2 iron clamps;
  • Earth Potential;
  • Step and touch voltage measurement with external P/S probe;
  • Insulation resistance with DC voltage from 50 V to 2500 V and PI, DAR calculation, Dielectric discharge (DD) ratio;
  • Capacitive measurements;
  • Varistor test 2,5 kV;
  • Withstand voltage test with DC voltage up to 2.5 kV;
  • Current measurements with AC clamps;
  • TRMS voltage and frequency measurements;
  • Low Ohm measurements with 7 mA and 200 mA DC test current;
  • µΩ measurements with DC test current up to 2 A.

Key features

  • Possibility of performing all main types of earth (Re), specific earth(Ro), potential (Us), insulation (Riso), resistance (µΩ), voltage / frequency and current measurements with a single instrument;
  • Multi frequency test signal on output voltage (20/40 Vac) in earth measurement for best noise immunity (55 Hz also supported);
  • Insulation resistance: wide range of insulation test voltages from 50 V to 2500 V, resistance measuring range up to 100 GΩ with Guard terminal, automatic discharge supported and additional filtering options (OFF, 5 s, 10 s, 30 s, 60 s);
  • Low Ohm (µΩ) resistance measuring range with µΩ resolution;
  • Resistance measurement (Four wire Kelvin method);
  • Resistance (µΩ) with single, continuous and inductive mode of operation with selectable current: 10 mA, 100 mA, 1A and 2A (bidirectional);
  • 4-wire / 2-wire 200 mA DC resistance measurement;
  • 2-wire continuity (7 mA) measurement;
  • Overvoltage category 600 V CAT II, 300 V CAT III; at 4000 m above sea level;
  • 4.3’’ colour LCD display with touch screen;
  • Programmable AUTO SEQUENCEs;
  • High degree of protection: IP 54;
  • Support for single or automated measurements;
  • Programabel Hi/Lo limits;
  • Built-in charger and rechargeable Li-Ion batteries as standard accessory;
  • BT communication with PC, Android tablets and smart phones via built-in BT;
  • PC SW Metrel ES Manager for measurement pre and post processing: preparation of the test structure, result download, tree-view, table view and graphical view, storing and printing.

Technical data

  • Dimensions (w x h x l): 250 X 110 X 160 mm
  • Weight (with batteries, without accessories): 1.6 kg



Datasheet Language Version Release Notes Type Size Download
MI 3288 Earth Insulation Tester en 2024 05.01.2024 pdf 933.22 KB
Manual Language Version Release Notes Type Size Download
MI 3288 Earth Insulation Tester en 1.4.4 07.12.2023 pdf 5.09 MB Login
MI 3288 Earth Insulation Tester Multi-Language 2023 20.01.2023 zip 4.1 MB Login
DoC Language Version Release Notes Type Size Download
EU Declaration of Conformity Multi-Language 06.07.2023 QR code External link Unknown
PC Software Language Version Release Notes Type Size Download
SW 1201 Metrel Electrical Safety Manager (MESM) Multi-Language 06.05.2024 Readme zip 369.81 MB Login

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