METREL EurotestCOMBO MI 3125 User Manual

MI 3125 / BT EurotestCOMBO Table of contents
4
Table of contents
1 Preface .................................................................................................................... 7
2 Safety and operational considerations ................................................................. 8
2.1 Warnings and notes .......................................................................................... 8
2.2 Battery and charging ....................................................................................... 11
2.2.1 New battery cells or cells unused for a longer period ............................................. 12
2.3 Standards applied ........................................................................................... 13
3 Instrument description ......................................................................................... 14
3.1 Front panel ...................................................................................................... 14
3.2 Connector panel .............................................................................................. 16
3.3 Back side ......................................................................................................... 17
3.4 Display organization ........................................................................................ 18
3.4.1 Terminal voltage monitor ....................................................................................... 18
3.4.2 Battery indication ................................................................................................... 18
3.4.3 Message field ........................................................................................................ 18
3.4.4 Result field ............................................................................................................ 19
3.4.5 Sound warnings ..................................................................................................... 19
3.4.6 Help screens ......................................................................................................... 19
3.4.7 Backlight and contrast adjustments ....................................................................... 20
3.5 Instrument set and accessories ....................................................................... 21
3.5.1 Standard set MI 3125 ............................................................................................ 21
3.5.2 Standard set MI 3125 BT ....................................................................................... 21
3.5.3 Optional accessories ............................................................................................. 21
4 Instrument operation ............................................................................................ 22
4.1 Function selection ........................................................................................... 22
4.2 Settings ........................................................................................................... 23
4.2.1 Memory (model MI 3125 BT) ................................................................................. 23
4.2.2 Language .............................................................................................................. 24
4.2.3 Date and time (model MI 3125 BT) ........................................................................ 24
4.2.4 RCD testing ........................................................................................................... 24
4.2.5 Isc factor................................................................................................................ 26
4.2.6 Commander support .............................................................................................. 26
4.2.7 Initial settings ........................................................................................................ 27
5 Measurements ...................................................................................................... 29
5.1 Voltage, frequency and phase sequence ........................................................ 29
5.2 Insulation resistance ........................................................................................ 31
5.3 Resistance of earth connection and equipotential bonding ............................. 33
5.3.1 R LOWΩ, 200 mA resistance measurement .......................................................... 34
5.3.2 Continuous resistance measurement with low current ........................................... 35
5.3.3 Compensation of test leads resistance .................................................................. 36
5.4 Testing RCDs .................................................................................................. 37
5.4.1 Contact voltage (RCD Uc) ..................................................................................... 38
5.4.2 Trip-out time (RCDt) .............................................................................................. 39
5.4.3 Trip-out current (RCD I) ......................................................................................... 40
5.4.4 RCD Autotest ........................................................................................................ 41
5.5 Fault loop impedance and prospective fault current ........................................ 44

METREL EurotestCOMBO MI 3125 Specifications

General

Brand	METREL
Model	EurotestCOMBO MI 3125
Category	Measuring Instruments
Language	English