1．Safe Testing .................................................................................. 1
2．Features ........................................................................................ 3
3．Specification .................................................................................. 6
4．Continuity (resistance) tests .......................................................... 9
4．1
Instrument layout ................................................................. 9
4．2
Resistance of test leads ....................................................... 9
4．3
Continuity testing ............................................................... 10
5．Insulation Tests ........................................................................... 11
5．1
The nature of insulation resistance .................................... 11
5．1．2
Capacitive current .............................................................. 11
5．1．3
Conduction current ............................................................ 12
5．1．4
Surface leakage current ..................................................... 12
5．1．5
Total leakage current ......................................................... 13
5．2
Damage to voltage-sensitive equipment ............................ 13
5．3
Preparation for measurement ............................................ 14
5．4
Insulation resistance measurement ................................... 14
6． Loop Impedance Tests ............................................................... 17
6．1
Voltage measurement ........................................................ 17
6．2
What is earth fault loop impedance? ................................. 17
6．3
Automatic over-temperature cut-out .................................. 17
6．4
The loop impedance test ................................................... 18
6．5
Loop impedance at 3 phase equipment ............................. 19
7．RCD Tests ................................................................................... 21
7．1
Purpose of RCD Test ......................................................... 21
7．2
What does the RCD test really do? ................................... 21
7．3
RCD testing ....................................................................... 21
7．4
Testing RCDs used to provide supplementary protection .. 22
7．5
Testing time delayed RCDs ............................................... 22
8．General ....................................................................................... 23
9．Battery replacement .................................................................... 24
10．Fuse replacement ....................................................................... 24
11．Servicing ..................................................................................... 25
12．Case, strap and shoulder pad assembly ..................................... 26
CONTENTS
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