MI 3250 MicroOhm 10A

Continuity testers

The MI 3250 MicroOhm 10 A is portable low resistance ohmmeter for measuring low resistances of breakers and switches, busbars, cable joints, small to medium sized transformer and motor windings for industrial application, etc., with test current up to 10 A. The used 4-lead Kelvin testing method together with automatic bidirectional procedure ensure very high accuracy of test results (0,25%). The instrument can be powered by mains or internal rechargeable batteries. Test results can be stored on the instrument and with PC software HVLink PRO that is supplied as a part of standard set enables transfer of measured results to PC where they can be analysed or printed.


Standards applied

IEC/EN 62271

  • IEC/EN 62271 series
  • IEC/EN 62271-1
  • IEC/EN 62271-100

ASTM B 539

  • ASTM B 539


  • NMEA AB 4-2009

El Real Decreto 223/2008

  • El Real Decreto 223/2008

IEEE C37.09

  • IEEE C37.09-2007


Measuring functions

  • Bidirectional resistance measurement from 0,1 µΩ up to 2000 Ω with test current up to 10 A;
  • Temperature compensation (with optional temperature probe).

Key features

  • Accurate: 0.1 nΩ best resolution with 0.25% accuracy.
  • Bar graph: on screen resistance bar graph.
  • Battery powered: more than 1000 measurements with 10 A test current can be performed when powered by internal battery only.
  • Safe: High overvoltage category CAT IV / 300 V.
  • Four measuring modes: Automatic, single, continuous and inductive.
  • Automatic thermal EMF elimination: with automatic bidirectional measurement.
  • Temperature compensation: measured resistance can be adjusted according to ambient temperature, which can be entered manually or measured by external probe.
  • Custom limits: limits can be set for PASS/FAIL evaluation of test results.
  • Portable: lightweight 3 kg design with carry handle and shoulder strap.
  • Memory: built-in memory enables storage of up to 1000 test results.
  • Downloadable: stored test results can be via RS232 or USB interface transferred to the PC with installed HVLink PRO software, which enables downloading, review, analyses and printing of the test results.

Technical data

  • Dimensions (w x h x l): 310 x 130 x 250 mm
  • Weight (with batteries, without accessories): 2.8 kg



  • Power generation
  • Thermal energy power plants
  • Testing high energy switches

Renewable energy sources

  • Renewable powerplants
  • Hydroelectric power
  • Wind power generation

Installations exceeding 1 kv

  • Testing contacts, joints and switches



Download File Language Version Release Notes Type Size View Download
Datasheet MI 3250 MicroOhm 10A en 2019 05.02.2019 pdf 736.07 KB
Manual MI 3250 MicroOhm 10A en 1.1.2 18.01.2017 20 751 893 pdf 1.06 MB Login
PC Software HVLink PRO en 11.8 01.06.2015 Readme zip 21.82 MB Login
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