HT instruments M71 User 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