METREL MI 3125 Short Instructions

MI 3125 / MI 3125E EurotestCOMBO Table of contents
3
Table of contents
1 Start-up guide ......................................................................................................... 4
1.1 Safety and operational considerations ................................................................ 4
1.2 Instrument description - Front and connector panel ........................................... 5
1.3 Instrument description - Meaning of symbols ..................................................... 5
1.4 Function selector switch and instrument display ................................................. 7
1.5 Battery handling .................................................................................................. 7
1.6 Maintenance ....................................................................................................... 8
1.6.1 Replacing fuses ........................................................................................... 8
1.7 Warranty & Repairs ............................................................................................ 9
1.8 Contact Metrel UK ............................................................................................ 10
2 Quick-test guide ................................................................................................... 11
2.1 Null the leads .................................................................................................... 11
2.2 Measurements .................................................................................................. 12
2.2.1 Online Voltage and frequency / Phase sequence - AC Voltage
measurement and frequency measurements, phase sequence ............................. 12
2.2.2 Insulation resistance - For testing the M value of the insulation between
wires ................................................................................................................... 14
2.2.3 Continuity for testing resistance of earth conductors and equipotential
bonding ................................................................................................................... 16
2.2.4 RCD testing - 3 functions for testing RCDs. ............................................... 18
2.2.5 Loop - Fault loop impedance ...................................................................... 20
2.2.6 Line impedance - (phase-neutral, phase-phase) ........................................ 22
2.2.7 Earthing resistance (MI 3125E) .................................................................. 24

METREL MI 3125 Specifications

General

Type	Multifunction Installation Tester
Insulation Resistance	Yes
Continuity Test	Yes
Loop Impedance	Yes
RCD Testing	Yes
Voltage Measurement	Yes
Frequency Measurement	Yes
Display	LCD
Power Supply	6 x 1.5 V AA batteries
Loop Resistance Resolution	0.01 Ω
Frequency	45 - 65 Hz
Line Voltage Resolution	1 V
Insulation Resistance Test Voltage	50 V, 100 V, 250 V, 500 V, 1000 V
Insulation Resistance Resolution	0.01 MΩ
Continuity Resistance Resolution	0.01 Ω
Test Current	200 mA
DC Voltage	Up to 600 V
Loop Resistance	0.0 Ω - 1999 Ω
Line Voltage	Up to 550 V
Line Voltage Accuracy	±2% ±2 digits
Rated Residual Current	10 mA, 30 mA, 100 mA, 300 mA, 500 mA
Insulation Resistance Range	0.01 MΩ to 1 TΩ
Continuity Resistance	0.0 Ω - 1999 Ω
Dimensions	220 x 103 x 55 mm
Operating Temperature	-10°C to 50°C
Storage Temperature	-20°C to +60°C
Safety Standards	EN 61557
Loop Resistance Accuracy	±(5% + 3 digits)