Megger MFT1845+ User Manual

Multifunction testers

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Table Of Contents

Table of Contents

Table of Contents
Safety
Safety Warnings
Live Earth Safety Precautions
Symbols Used on the Instrument
Introduction
Overview
Front Panel and Controls
Display
Display Symbols
Waste Electrical and Electronic Equipment
Battery and Fuse Location, Fitting and Replacement
Operation
General Operation - All Models
Switching on
Switching off
Backlight
Test Buttons
Test Button Lock
Mode Button Functions
Test Inhibit
Insulation
Continuity
Earth Loop Impedance
RCD/GFCI Testing
Earth Testing
Battery Exhausted
Voltage, Frequency, Current and Temperature Measurement
Making a Voltage Measurement
Frequency Measurement
Phase Rotation
Leakage Current Measurement
Temperature Measurement
Switch Probe
Continuity / Resistance Measurement
Nulling Test Lead Resistance (up to 9.99 Ohms) W
Making a CONTINUITY Measurement
Storing / Downloading Results
Continuity Buzzer ON/OFF
Switch Probe (SP5)
Buzzer Threshold
Measurement Methods and Sources of Error
Insulation Resistance
Making an INSULATION Measurement
Insulation Test Lock
Measurement Methods and Sources of Error
Loop Impedance Testing
Range Selection and Test Leads
Phase to Earth L-E Circuits
L-N or L-L Circuits
Z, Zmax, Zref and R1+R2
Making a Loop Impedance Measurement
Ze Measurements at the Origin (Phase to Earth)
Zs and Zdb Loop Measurements Without RCD - Eg Zs, Zdb Etc
Earth Loop Measurements with an RCD in Circuit
Phase to Neutral (All Models) or Phase to Phase Testing
Prospective Fault Current and Short Circuit Calculation (PFC & PSCC)
Confidence Metertm for Non-Trip (3Lo) Loop Impedance Tests
Display Information
3Lo Loop Impedance Measurement
Measurement Methods and Sources of Error
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) Testing
Making an RCD Measurement
Selecting RCD Type
RCD Current Rating (No-Trip Test)
I RCD Current Rating (Tripping Test on 30 Ma RCD)
I RCD Current Rating (Tripping Test on 30Ma RCD) (Not MFT1815)
I RCD Current Rating (Tripping Test on 30 Ma RCD)
Ramp Test
Fast Ramp Test
Type a (DC Sensitive) RCD Test
Type B (Pure DC) RCD Test (Not MFT1815)
Variable Rcds
AUTO RCD Testing
Phase RCD Testing
Touch Voltage Display
Measurement Methods and Sources of Error
Useful Information
Testing of Electric Vehicle Charge Point Rcd's
Earth Resistance Measurement
Connection Terminals
Touch Voltage Limit
Making a Measurement - Two Pole Resistance Measurement
Making a Measurement - Three Terminal Resistance Measurement
Making a Measurement - Three Terminal Resistance Measurement Using ART
Two-Clamp Stake-Less Measurement (MFT1835 and MFT1845+ Only)
Setup Options
Warning Messages
Startup Warnings
Battery
Battery Charger
Fuse Warning
Invalid Rotary Switch Setting
Continuity Test
Insulation Test
RCD Test (or GFCI)
RCD Range Selection Errors
Loop Test
Earth Test
Test will Not Start
Appendix A - Sending, Storing, Deleting and Recalling Test Results (MFT1835 and MFT1845+)
(MFT1835 and MFT1845+)
Appendix C - Installation Category Definitions
Appendix D - Safe Working Practice
Appendix E - Cleaning and Maintenance
Appendix F - Earth Resistance Testing - Basic Principles
Principle of Operation (Three-Terminal Resistance Measurement)
Principle of Operation (Three-Terminal Resistance Measurement Using ART)
Principle of Operation (Two-Clamp Stake-Less Resistance Measurement)
Specifications
Accuracy
Insulation Test
Continuity / Resistance
Loop Test 2Hi (L-PE, L-N, L-L)
Loop Test 3Lo, 2Lo (L-E)
RCD Test
Voltage
Frequency
Earth Test Ranges
Current (Via Clamp Meter)
MV Sensor Input
Internal Memory
Power Consumption
Temperature (Via 3Rd Party Module)
Environmental Specification
Accessories
Repair and Warranty
Calibration, Repair and Spare Parts
Approved Service Centres

Quick Links

1 Earth Testing
2 Earth Loop Impedance
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