Megger MFT1815 - Page 69

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www.megger.com MFT1800 series

Repair and Warranty

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Table of Contents4
Safety8
Safety Warnings8
Live Earth Safety Precautions9
Symbols Used on the Instrument10
Introduction11
Overview11
Front Panel and Controls11
Display12
Display Symbols12
Waste Electrical and Electronic Equipment13
Battery and Fuse Location, Fitting and Replacement13
Operation15
General Operation - All Models15
Switching on15
Switching off15
Backlight15
Test Buttons15
Test Button Lock15
Mode Button Functions16
Test Inhibit17
Insulation17
Continuity17
Earth Loop Impedance17
RCD/GFCI Testing17
Earth Testing17
Battery Exhausted17
Voltage, Frequency, Current and Temperature Measurement18
Making a Voltage Measurement18
Frequency Measurement19
Phase Rotation19
Leakage Current Measurement19
Temperature Measurement19
Switch Probe20
Continuity / Resistance Measurement21
Nulling Test Lead Resistance (up to 9.99 Ohms) W21
Making a CONTINUITY Measurement22
Storing / Downloading Results22
Continuity Buzzer ON/OFF22
Switch Probe (SP5)23
Buzzer Threshold23
Measurement Methods and Sources of Error23
Insulation Resistance24
Making an INSULATION Measurement24
Insulation Test Lock25
Measurement Methods and Sources of Error25
Loop Impedance Testing26
Range Selection and Test Leads26
Phase to Earth L-E Circuits26
L-N or L-L Circuits28
Z, Zmax, Zref and R1+R228
Making a Loop Impedance Measurement28
Ze Measurements at the Origin (Phase to Earth)28
Zs and Zdb Loop Measurements Without RCD - Eg Zs, Zdb Etc29
Earth Loop Measurements with an RCD in Circuit30
Phase to Neutral (All Models) or Phase to Phase Testing32
Prospective Fault Current and Short Circuit Calculation (PFC & PSCC)33
Confidence Metertm for Non-Trip (3Lo) Loop Impedance Tests34
Display Information34
3Lo Loop Impedance Measurement34
Measurement Methods and Sources of Error36
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) Testing37
Making an RCD Measurement38
Selecting RCD Type38
RCD Current Rating (No-Trip Test)39
I RCD Current Rating (Tripping Test on 30 Ma RCD)40
I RCD Current Rating (Tripping Test on 30Ma RCD) (Not MFT1815)41
I RCD Current Rating (Tripping Test on 30 Ma RCD)41
Ramp Test42
Fast Ramp Test42
Type a (DC Sensitive) RCD Test42
Type B (Pure DC) RCD Test (Not MFT1815)43
Variable Rcds44
AUTO RCD Testing44
Phase RCD Testing45
Touch Voltage Display45
Measurement Methods and Sources of Error46
Useful Information46
Testing of Electric Vehicle Charge Point Rcd's47
Earth Resistance Measurement49
Connection Terminals49
Touch Voltage Limit49
Making a Measurement - Two Pole Resistance Measurement49
Making a Measurement - Three Terminal Resistance Measurement50
Making a Measurement - Three Terminal Resistance Measurement Using ART51
Two-Clamp Stake-Less Measurement (MFT1835 and MFT1845+ Only)52
Setup Options53
Warning Messages54
Startup Warnings54
Battery54
Battery Charger54
Fuse Warning54
Invalid Rotary Switch Setting54
Continuity Test54
Insulation Test54
RCD Test (or GFCI)54
RCD Range Selection Errors55
Loop Test55
Earth Test55
Test will Not Start55
Appendix A - Sending, Storing, Deleting and Recalling Test Results (MFT1835 and MFT1845+)56
(MFT1835 and MFT1845+)60
Appendix C - Installation Category Definitions61
Appendix D - Safe Working Practice61
Appendix E - Cleaning and Maintenance61
Appendix F - Earth Resistance Testing - Basic Principles62
Principle of Operation (Three-Terminal Resistance Measurement)62
Principle of Operation (Three-Terminal Resistance Measurement Using ART)63
Principle of Operation (Two-Clamp Stake-Less Resistance Measurement)63
Specifications64
Accuracy64
Insulation Test64
Continuity / Resistance64
Loop Test 2Hi (L-PE, L-N, L-L)64
Loop Test 3Lo, 2Lo (L-E)64
RCD Test65
Voltage65
Frequency65
Earth Test Ranges65
Current (Via Clamp Meter)65
MV Sensor Input66
Internal Memory66
Power Consumption66
Temperature (Via 3Rd Party Module)66
Environmental Specification66
Accessories67
Repair and Warranty68
Calibration, Repair and Spare Parts68
Approved Service Centres68

Megger MFT1815 - Page 69

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