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METREL MI 3125 User Manual

METREL MI 3125
60 pages
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InstaltestCOMBO
MI 3125
Instruction manual
Version 1.4, Code no. 20 751 753

Table of Contents

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METREL MI 3125 Specifications

General IconGeneral
TypeMultifunction Installation Tester
Insulation ResistanceYes
Continuity TestYes
Loop ImpedanceYes
RCD TestingYes
Voltage MeasurementYes
Frequency MeasurementYes
DisplayLCD
Power Supply6 x 1.5 V AA batteries
Loop Resistance Resolution0.01 Ω
Frequency45 - 65 Hz
Line Voltage Resolution1 V
Insulation Resistance Test Voltage50 V, 100 V, 250 V, 500 V, 1000 V
Insulation Resistance Resolution0.01 MΩ
Continuity Resistance Resolution0.01 Ω
Test Current200 mA
DC VoltageUp to 600 V
Loop Resistance0.0 Ω - 1999 Ω
Line VoltageUp to 550 V
Line Voltage Accuracy±2% ±2 digits
Rated Residual Current10 mA, 30 mA, 100 mA, 300 mA, 500 mA
Insulation Resistance Range0.01 MΩ to 1 TΩ
Continuity Resistance0.0 Ω - 1999 Ω
Dimensions220 x 103 x 55 mm
Operating Temperature-10°C to 50°C
Storage Temperature-20°C to +60°C
Safety StandardsEN 61557
Loop Resistance Accuracy±(5% + 3 digits)

Summary

Preface

Safety and Operational Considerations

General Warnings and Notes

Safety warnings for instrument use, electrical installations, and handling.

Warnings Related to Measurement Functions

Specific warnings for Insulation resistance, continuity, PE terminal, and socket tests.

Function-Specific Warnings (Continuity, RCD, Z-LOOP, Z-LINE)

Warnings for continuity, RCD, Z-LOOP, Z-LINE, and Socket tests.

Battery and Charging

Battery Care for New or Unused Cells

Procedure to improve battery lifetime for new or long-unused cells.

Applicable Standards and Regulations

Instrument Description

Front Panel Overview

Description of the instrument's front panel layout, buttons, and LCD display.

Connector Panel Details

Details of the instrument's input/output connectors and their functions.

Back Panel and Battery Compartment

Description of the instrument's back panel, including battery compartment and fuse.

Display Organization and Elements

Explanation of the instrument's display elements like result, message, and voltage fields.

Result Field Indicators and Sound Warnings

Explanation of result field indicators (PASS/FAIL) and sound warnings.

Backlight and Contrast Adjustment

Instructions on how to adjust the display's backlight and contrast settings.

Standard and Optional Accessories

Lists standard and optional accessories included with the instrument.

Instrument Operation

Function Selection Procedure

How to select different test or measurement functions using the function selector.

Settings: Language Selection

Guide for selecting the instrument's display language.

Settings: Restoring Initial Values

How to restore the instrument's settings to default factory values.

Settings: RCD Test Standards

How to select the relevant standard for RCD test procedures.

Settings: Isc Factor and Commander Support

Setting the Isc factor and enabling/disabling commander support.

Commander Support Functionality Notes

Further notes on commander support settings and potential interference.

Measurements

Test Lead Resistance Compensation

Procedure to compensate for test lead resistance for accurate measurements.

Voltage, Frequency, and Phase Sequence Measurement

How to measure voltage, frequency, and determine phase sequence.

Voltage Measurement Results and Interpretation

Steps for performing voltage measurements and interpreting results in single/three-phase systems.

Insulation Resistance Measurement Overview

How to perform insulation resistance tests and typical applications.

Insulation Resistance Measurement Procedure

Step-by-step guide for insulation resistance measurement and result interpretation.

Earth Connection and Equipotential Bonding Resistance

How to measure earth connection and equipotential bonding resistance.

200 mA Resistance Measurement (R LOWΩ)

Procedure for performing the 200mA resistance measurement.

RCD Testing: General Data and Parameters

Overview of RCD testing parameters, types, and standards.

Contact Voltage (RCD Uc) Measurement

Procedure for measuring contact voltage (Uc) to verify RCD safety.

Trip-out Time (RCDt) Measurement

How to measure the trip-out time of an RCD at different residual currents.

Trip-out Current (RCD I) Measurement

Procedure to measure the trip-out current of an RCD.

RCD Autotest Functionality

How to perform a complete, automated RCD test sequence.

RCD Autotest: Step-by-Step Results

Examples of individual steps and overall results in RCD autotest.

RCD Autotest: Interpreting Results and Notes

Explanation of displayed results and important notes for RCD autotest.

Fault Loop Impedance and Prospective Fault Current

How to measure fault loop impedance and calculate prospective fault current.

Fault Loop Impedance Measurement Procedure

Steps for performing fault loop impedance measurements and calculation of Isc.

Line Impedance and Prospective Short-Circuit Current

How to measure line impedance and calculate prospective short-circuit current.

Line Impedance Measurement Procedure

Steps for performing line impedance measurements and calculation of Isc.

Socket Outlet Test Procedure

How to perform a socket outlet test for polarity and connection checks.

Socket Test Measurement Steps and Results

Steps for executing the socket outlet test and interpreting its results.

PE Test Terminal: Fault Detection

How the PE test terminal detects dangerous voltages on PE wire due to incorrect wiring.

PE Terminal Test Procedure and Notes

Steps for performing the PE terminal test and related operational notes.

Maintenance and Care

Fuse Replacement Procedure

Instructions for replacing the instrument's fuse, including warnings.

Instrument Cleaning Guidelines

Instructions for cleaning the instrument's housing.

Periodic Calibration Importance

Importance and procedure for regular instrument calibration.

Software Upgrading Process

How to upgrade the instrument's software via PC.

Service and Repair Contact

Information on how to contact for repairs and service.

Technical Specifications

Insulation Resistance Measurement Specs

Technical details for insulation resistance measurements.

Continuity and R LOWΩ Measurement Specs

Technical specifications for continuity and low resistance measurements.

RCD Testing Specs: General Data and Contact Voltage

RCD testing general data, test current shapes, and contact voltage specs.

RCD Testing Specs: Trip-out Time and Current

Technical specs for RCD trip-out time and trip-out current measurements.

Fault Loop Impedance Measurement Specs

Technical specifications for fault loop impedance measurements.

Fault Loop Impedance & RCD Selected Specs

Specs for prospective fault current and RCD selected fault loop impedance.

Line Impedance Measurement Specs

Technical specifications for line impedance and prospective short-circuit current.

Socket Test and Phase Rotation Specs

Specs for socket test, phase rotation, voltage, and frequency measurements.

Voltage, Frequency, and General Data Specs

Specs for online voltage monitor, general data, operating, and storage conditions.

Appendix A: Fuse Data Tables

Fuse Types NV and gG Data

Tables showing disconnection times and prospective short-circuit currents for NV and gG fuses.

Fuse Types B and C Data

Tables for disconnection times and prospective short-circuit currents for B and C fuses.

Fuse Types K and D Data

Tables for disconnection times and prospective short-circuit currents for K and D fuses.

Appendix B: Accessories Guide

Accessories for Specific Measurements

Lists suitable accessories for various measurement functions.

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