HT instruments M71 - Manual (Page 2)

M71
EN – 1
Table of contents:
1. SAFETY PRECAUTIONS AND PROCEDURES ......................................................... 2
1.1. Preliminary instructions ..................................................................................................... 3
1.2. During use ........................................................................................................................ 3
1.3. After use ........................................................................................................................... 3
1.4. Definition of measurement category (OVERVOLTAGE) .................................................. 4
2. GENERAL DESCRIPTION .......................................................................................... 5
3. PREPARING THE INSTRUMENT ............................................................................... 5
3.1. Initial check ....................................................................................................................... 5
3.2. Power supply .................................................................................................................... 5
3.3. Calibration ......................................................................................................................... 5
3.4. Storage ............................................................................................................................. 5
4. WORKING INSTRUCTIONS ....................................................................................... 6
4.1. Instrument description ...................................................................................................... 6
4.1.1. S WITCHING ON ............................................................................................................................. 7
4.1.2. A UTO P OWER OFF ...................................................................................................................... 7
4.2. Auto mode ........................................................................................................................ 7
4.3. EARTH 2W:Two-wire earth resistance measurement ...................................................... 8
4.3.1. EARTH 2W- Z ERO SETTING OF CABLES ........................................................................................ 8
4.3.2. EARTH 2W- M EASUREMENT PROCEDURE .................................................................................. 10
4.3.3. M ESSAGE DESCRIPTION FOR EARTH 2W MEASUREMENT ............................................................ 12
4.4. EARTH 3W: Three wire earth resistance measurement ................................................. 13
4.4.1. EARTH 3W- Z ERO SETTING OF CABLES ...................................................................................... 13
4.4.2. EARTH 3W- M EASUREMENT PROCEDURE .................................................................................. 15
4.4.3. M ESSAGE DESCRIPTION FOR EARTH 3W MEASUREMENT ............................................................ 17
5. MAINTENANCE ........................................................................................................ 19
5.1. General ........................................................................................................................... 19
5.2. Battery replacement ........................................................................................................ 19
5.3. Cleaning .......................................................................................................................... 19
5.4. End of life ........................................................................................................................ 19
6. TECHNICAL SPECIFICATIONS ............................................................................... 20
6.1. Technical features .......................................................................................................... 20
6.1.1. S AFETY STANDARDS ................................................................................................................... 21
6.1.2. G ENERAL FEATURES .................................................................................................................. 21
6.2. Environment .................................................................................................................... 21
6.2.1. E NVIRONMENTAL CONDITIONS ..................................................................................................... 21
6.3. Accessories .................................................................................................................... 21
7. SERVICE................................................................................................................... 22
7.1. Warranty terms ............................................................................................................... 22
7.2. After sales service .......................................................................................................... 22
8. PRACTICAL REPORTS FOR ELECTRICAL TESTS ................................................ 23
8.1. Earth resistance measurement in TT systems ............................................................... 23
8.2. Earth resistance measurement, volt ampere metric method .......................................... 24