Insulation Testers

Insulation Testers

MetrelHV insulation testers are portable instruments intended to measure the insulation resistance by using high DC test voltages up to 10kV. Insulation resistance and other insulation parameters are tested with various methods in the range up to 10TΩ.



MI 3210 TeraOhm XA 10kV is a portable, battery or mains powered test instrument with excellent IP protection (IP65), intended for diagnosing of Insulation Resistance by using high DC test voltages of up to 10 kV. Because of its robustness (CAT IV protection) and high immunity to radiated RF fields it is best suited for industrial environment.


  • Insulation Measurement;
  • Diagnostic Test (PI, DAR, DD) ;
  • Step Voltage Test;
  • Withstanding Voltage Test (DC) up to 10 kV;
  • Voltage and frequency measurement up to 550 V TRMS.


  • Insulation resistance up to 20 TΩ;
  • Adjustable test voltage (50 V…10 kV) 50 V and 100 V step;
  • Programmable timer;
  • Capacitance measurement;
  • Charging rate for capacitive load < 3 s / µF at 10 kV;
  • Automatic discharge of test object after completion of measurement;
  • Guard terminal
  • High voltage breakdown detection;
  • Custom defined tests
  • Auto adjustment function
  • Measurement  results in numerical and graphical form;
  • PC software HVLink PRO for downloading and analyzing of the test results and test report printing;
  • Isolated RS232 and USB communication ports, BT interface;
  • High quality accessories including shielded test leads in standard set;
  • High EM interferences protection: Input AC current noise rejection (1 mA∞600 V) and additional averaging of the result (5, 10, 30, 60);
  • CAT IV / 600 V;
  • Mains and rechargeable battery power supply


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TeraOhm 10 kV is professional insulation tester, which allows measuring and testing high voltage equipment

  • Insulation resistance up to 10 TΩ
  • DC Test voltage 500 V – 10 kV in step of 25 V
  • The short circuit current is 5 mA
  • Auto-calibation of measuring system
  • Operates from mains or rechargeable supply
  • Automatic discharge of capacitive loads
  • Digital and bar graph results with date and time
  • User friendly PC software with RS232 or USB isolated communication port
  • High quality accessories
  • High noise immunity
  • Highest protection degree CAT IV 600 V

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MI 3201 TeraOhm 5 kV insulation tester is a portable instrument intended to measure insulation resistance through the use of high voltage DC test voltages up to 5 kV. The large LCD screen allows real-time R(t) graphs to be displayed



  • Automated testing – PI, DD, DAR calculations with automated resistance ranging (AR). All data is displayed during one single measurement.
  • Fault finding – Fully programmable step voltage and withstanding voltage test functions to assist in diagnosing faults in insulation.
  • R(t) graph – Real time resistance against time graph plotting facility to graphically illustrate the response of a material to an applied test voltage.
  • Faster testing – High 5 mA charging current quickly charges capacitive loads.
  • Accurate – Selectable noise rejection filters (up to 5 mA) and shielded cables as standard ensure accurate readings.
  • Safe – High CAT IV, 600 V voltage protection
  • Portable – Lightweight 3 kg design with carry handle and shoulder strap

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MI 3202 GigaOhm 5 kV provides a quick and accurate reading of insulation resistance. The large segment LCD screen with backlight offers easy reading of results. The analogue/digital display with analogue graph has a range of up to 1 TΩ for insulation resistance and 600 V for voltage measurements.


  • Quick setting – Quick & Easy test voltage selection
  • Faster testing – 5 mA current source for quick charging of capacitive loads
  • Safe – High CAT IV, 600 V voltage protection
  • Easy to read – Large, bright LCD display with backlight
  • Effective testing – High quality instrument, shielded test leads and accessories (included in the standard set)

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Advanced, digital HV measuring instrument with maximum test voltage up to 5000 V DC and resistance measuring range up to 5 TΩ.


  • Automatic PI, DAR and DD index calculation and capacitance measurement up to 50µF.
  • Adjustable test voltage from 250 V to 5000 V in 50 V steps.
  • Resistance measuring range 5 TΩ.
  • Adjustable measuring time from 1 second to 90 minutes.
  • Automatic load discharge after completed measurement.
  • Guard terminal for elimination of insulation surface currents.
  • AC and DC voltage measurement up to 600 V.
  • Internal memory module stores up to 1000 measuring results.
  • Optional: 110 V version

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MI 3121H Smartec 2.5KV Insulation / Continuity


The MI 3121H Smartec 2,5 kV Insulation / Continuity is the portable measuring instrument for complete diagnostic testing of insulation and continuity measurements.


  • Insulation resistance up to 100 GΩ with DC voltage up to 2.5 kV;
  • PI, DAR calculation;
  • Continuity of PE conductors with 200 mA test current and polarity change;
  • Continuity of PE conductors with 7 mA test current (continuous measurement) without RCD tripping;
  • TRMS voltage and frequency.

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MI 3121 Smartec Insulation/Continuity


MI 3121 SMARTEC Insulation / Continuity for verification, maintenance and periodic testing of electrical installations; PE conductors, main and supplementary PE connections, troubleshooting, insulation resistance, observation of insulation trends and insulation of control, signal, telecom wiring (50 V, 100 V). Suitable for testing on CAT IV installations


  • Very large LCD display with bargraph and backlight
  • High measuring range of up to 30 GΩ with test voltage from 50 V to 1000 V
  • Fast and reliable continuity tests with automatic polarity reversal
  • Voltage and frequency measurements
  • Preprogrammed limits
  • PASS/FAIL evaluation of result
  • Bright GREEN/RED indicators provides visual evaluation of results
  • Suited for testing on CAT IV installations
  • Magnetic holder allows hands-free operation
  • Built-in battery charger
  • Two level memory structure for saving of test results and parameters
  • Basic downloading with EuroLink PRO PC SW package
  • Compatible with EuroLink PRO Plus PCSW package
  • USB and RS232 ports
  • Robust and ergonomic design

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MI 3103 Insulation Tester Gigaohm 1 KV


The GigaOhm 1 kV is a portable hand-held battery powered test instrument intended for testing of safety measures on mains installations.


Insulation Resistance

  • Three different test voltages (250, 500 and 1000 V) provide the tests required for all installations encountered.
  • Extremely wide range  of measured insulation resistance (up to 2 GW) enables periodic analysis of changes in insulation material.
  • Automatic discharge of the equipment under test after completion of the test.


  • 200 mA measurement with automatic polarity change.
  • Automatic compensation of test leads (up to 5 W) eliminates lead resistance.
  • Continuous low current resistance measurement for testing of electrical motors, inductive windings, transformers, etc.

RMS Voltage and Frequency

  • Warnings are given if hazardous voltages are detected.
  • Auto power-off.

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