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MI 3155 EurotestXD Insulation Resistance Tester

Metrel MI 3155 EurotestXD is an advanced multi-functional measuring instrument designed specifically for testing in industry: electrical power systems, industrial systems, building facility management & special installations/locations inc. EVSE (Electrical Vehicle Supply Equipment support) using Metrel 1532 EVSE adapter.

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Metrel MI 3155 EurotestXD Installation Tester for testing in industry

Metrel MI 3155 has been designed for electrical power systems, industrial systems, building facility management and special installations/locations.

Metrel MI 3155 EurotestXD is the newest flagship of Metrel’s most advanced line of multi-functional measuring instruments and is designed specifically for testing in industry. What differentiates this instrument from the rest is its ergonomic design and an intuitive user interface, encompassing a memory organiser and fully programmable AUTO SEQUENCEs, managed through a large colour touch-screen display.

Fully compliant with functionality standards (e.g. IEC/EN 61557) and other reference standards for testing (e.g. IEC/EN/HD 60364-4-41,...) as is required for any instrument that performs TRMS current measurements, RCD tests, line and loop impedance tests with 3 (and 4) wires and earth resistance measurements. Besides those, the instrument supports a wide range of tests and measuring functions, including on-line voltage monitoring, phase sequence testing, varistor testing, PI/DAR calculation, luminance measurement, discharge time testing, ISFL measurements, IMD tests as well as functional and visual inspections.


Metrel MI 3155 Measuring Functions:

  • Live Transformer’s Impedance Measurement with Four Wire Test
  • Hi-precision Short Circuit Current evaluation with Calculated Hot factor
  • 3-wire test of PE (RPE function) without extension lead conductor
  • Autotest insulation function between L-N, N-PE and L-PE (R ISO ALL function)
  • 4 wire continuity test
  • Insulation resistance with DC voltage from 50 V to 2500 V and PI, DAR calculation
  • Varistor test
  • Continuity of PE conductors with 200 mA DC test current with polarity change
  • Continuity of PE conductors with 7 mA test current without RCD tripping
  • 2-wire and 3-wire loop impedance (L-PE) measurement with Trip Lock RCD function
  • Touch voltage / Contact voltage measurement with external P/S probe
  • 2-wire and 3-wire line impedance (L-L, L-N) measurement
  • 1-phase / 3-phase TRMS voltage and frequency measurements
  • Line, loop and RCD measurements at frequency range 16 ... 400 Hz
  • Phase sequence
  • Power and THD measurement (up to the 12th harmonic)
  • RCD testing (general and selective, type AC, A, F, B, B+, MI RCD, EV RCD, PRCD, PRCD-K, PRCD-S)
  • Earth resistance (3-wire and 2-clamps method)
  • Specific earth resistance with Ro-adapter (option)
  • TRMS leakage and load currents (option)
  • First fault leakage current (ISFL)
  • Testing of Insulation Monitoring Devices (IMDs)
  • Machine mode support with time discharge
  • Illumination (option)
  • High resolution Loop impendance (mΩ) (option)
  • EVSE (Electrical Vehicle Supply Equipment) support (option)
  • Determining location of cables (option)
  • QR and/or barcode scanner support (option)


▶ Metrel MI3155 MFT Features & Functions:

Video thumbnail Metrel MI3155 MFT Installation Tester

 Metrel MI 3155 Key Features:

  • Programmable AUTO SEQUENCEs
  • Predefined profile dependent AUTO SEQUENCEs
  • Predefined Automatic tests
    • - Auto TT (U, Zln, Zs, Uc)
    • - Auto TN/RCD (U, Zln, Zs, Rpe)
    • - Auto TN (U, Zln, Zlpe, Rpe)
    • - Auto IT (U, Zln, Isc, Isfl, IMD)
  • Functional inspections
  • Visual inspections
  • Custom inspections (visual and functional) which may be incorporated into AUTO SEQUENCEs
  • EVSE AUTO SEQUENCEs and function inspections
  • Machine functional and visual inspections
  • Built-in help screens for referencing on site
  • Built-in fuse tables for automatic evaluation of the line / loop impedance result
  • Monitoring of all 3 voltages in real-time
  • Automatic polarity reversal on continuity test
  • Automated RCD testing procedure (RCD AUTO)
  • Automated Impedance testing procedure (Z AUTO)
  • Measurement filtering according to the selected area group
  • Built-in charger and rechargeable batteries as standard accessory
  • BT communication with PC, Android tablets and smart phones via built-in BT


Metrel MI 3155 Applications:

Electrical Power Systems:-

  • Power Plants
  • Distribution
  • Safety
  • Connections / Bondings
  • Insulation Analysing
  • Earthings / Funnels

Industrial Systems:-

  • LV Installations Safety / Quality
  • UPS Systems testing
  • Switchboards / Control gears
  • Machines / Power Loads
  • Working Places Health / Safety Care
  • Maintenance / Troubleshooting
  • 3-phase system testing

Building Facility Management:-

  • Public areas Safety / Quality
  • Fire Safety
  • Risk Assessments
  • Environmental Issues

Special Installations / Locations:-

  • Construction Sites
  • Railway Systems
  • Ships / Boats / Marina Places
  • Fire Brigade Vehicles
  • Military / Police Vehicles
  • Mobile LV Generator Units
  • Medical Sites / Surgery Rooms
  • Mobile Video / Audio / Concert Halls / Fair Playground


What comes with the Metrel MI 3155?

  • Metrel MI 3155 EurotestXD Installation Tester
  • 4400 mAh battery pack
  • Power supply adapter 12V/3A
  • Tip commander + 2 x bat. AAA
  • Mains plug cable 1,5 m
  • Test lead green 1,5 m
  • Test lead, 4-wire, 1,5 m
  • Test lead, 3-wire, 1,5 m
  • Test lead, 2-wire, 2,5 kV, 1.5 m
  • Test probe, 6 pcs (black, brown, blue, green-2, red)
  • Crocodile clip, 7 pcs (black-2, brown, blue, green, red-2)
  • Earth set, 3-wire 20 m
  • USB cable
  • Soft carrying bag
  • Soft carrying neck belt
  • Metrel ES Manager BASIC license*
  • Short instruction manual
  • Instruction manual (CD)
  • Guide for testing and verification of Low voltage installations (CD)
  • Calibration certificate
  • Metrel ES Manager (program installation) A 1481 (CD)


*Metrel ES Manager can be downloaded free of charge from Metrel Web server.


Technical Specification for: Metrel MI 3155 EurotestXD Insulation Resistance Tester

El. LV Installation Safety Modes
Industrial Mode
Medical Mode
EVSE ModeOption
Machine Mode
IT Vehicles / Mobile Units Mode
Lightning Mode
Project Structure
Visual Inspection Mode
Functional Inspection Mode
Advanced User Interface
Colour display
Touch screen
Adaptable user interface
Graphical Help Menus
Database System Built In
Programmable Memory Structure
Multi-level Memory Organiser
On-site Parameter Settings
Auto Tests
AUTO IT (U, Zln, Isc, Isfl, IMD)
AUTO TN (U, Zln, Zlpe, Rpe)
AUTO TN/RCD (U, Zln, Zs, Rpe)
AUTO TT (U, Zln, Zs, Uc)
Auto Test Insulation L-PE, N-PE, L-N
Auto Test Line/Loop Impedance TN/TT
Autosequence programmable
PASS/FAIL System Evaluation
Custom Visual/Functional Inspection
AUTOSEQUENCE Barcode testing
Automatic test sequences
Multitest sequence
SDK support 
Upload structure
Upload measurements
Three Phase 
3-Phase system (Phase SEQUENCE)
Differential leakage currentOption
Load test
Power Measurements
Active power
Reactive power
Apparent power
Power factor
Microclimatic Measurements
Earth Bond / Continuity
Ring Test 200 mA (UK installations)
Ring Auto 200 mA (UK installations)Option
Automatic polarity reversal
Max Test Current 200 mA 2-wire
Max Test Current 200 mA 4-wire
PE lead resistance 200 mA 3-wire
Max Test Current 7 mA 2-wire
ΔR 300 A 4-wire Measurement with ClampOption
Insulation Resistance
Test Voltage 50 V
Test Voltage 100 V
Test Voltage 250 V
Test Voltage 500 V
Test Voltage 1000 V
Test Voltage 2500 V
Test of IMD
Test of ELM
Test of RCM
Automatic Discharge
Max resistance range 999 MOhm
Calculation of PI
Calculation of DAR
DC Ramp Voltage Test/Varistor test
Leakage Current
Differential LeakageOption
Leakage Current (with optional Clamp)Option
ISFL: L1,L2 (First Fault Leakage)
AC Insulation Leakage
Z Line / Loop Impedance
DC circuit Zline/loopOption
Zline L-L, L-N Ipsc - 3 Wire
Zloop L-PE, Ipfc - 3 Wire
Zs (rcd) - 3 Wire
Zs (rcd) - 2 Wire
Zref, ΔU%
Fuse Tables
Max. Ipfc = 20kA
Zline L-L, L-N Ipsc - 4 wire
Zloop L-PE, Ipfc - 4 wire
16 Hz...400 Hz Extended Range
High Precision mOhm Zline/loopOption
High Current Test > 300A 4-wireOption
RCD type AC
RCD type A
RCD type F
RCD type B
RCD type B+
RCD I Ramp
RCD Auto
RCD 3-Phase
RCD-S (Selective)
RCD (t)
PRCD type AC
PRCD type A
Earth (Electric) Leakage RelayOption
PRCD type B
PRCD type B+
PRCD type F
Discharge Time
34 V (1…5 s)
60 V (1…5 s)
120 V (1…5 s)
Harmonics Analysis 
THD current
THD voltage
Current harmonics
Voltage harmonics
Voltage AC 
Voltage TRMS
Current AC
Current TRMS
Earth/Ground Resistance
Earth Resistance 2-wire
Earth Resistance 3-wire
Two Iron Clamps Earth ResistanceOption
S / P potential probe test
Wenner 4-wire Specific Earth ResistanceOption
Additional Features
PASS / FAIL Indicators
Test Lead Compensation
High precision resolutionOption
High precision resolution mOhmOption
Cable locationOption
User Accounts
Back Light
QWERTY Keyboard
Virtual Keyboard
Battery Powered
Mains Supply / PE Check
Rechargeable Batteries in standard delivery
Graphical on Line Help
Internal memory
microSD memory card
Voltage Monitoring
Communication Port USB
Communication Port RS232 - PS/2
Built-in Bluetooth
Android Application
QR-Code Printing / ScanningOption
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