Manual

1．Safe Testing.................................................................................... 1
2．Features.......................................................................................... 3
3．Specification................................................................................... 6
4．Continuity (resistance) tests........................................................... 10
4．1 Instrument layout................................................................... 10
4．2 Test procedure.......................................................................10
5．Insulation Tests............................................................................... 12
5．1 The nature of insulation resistance........................................ 12
5．1．2 Capacitive current.................................................................. 12
5．1．3 Conduction current................................................................ 13
5．1．4 Surface leakage current........................................................ 13
5．1．5 Total leakage current..............................................................14
5．2Damage to voltage sensitive equipment................................ 14
5．3 Preparation for measurement................................................ 15
5．4Insulation resistance measurement....................................... 15
6． Loop Impedance Tests.................................................................. 18
6．1 Voltage measurement............................................................18
6．2 What is earth fault loop impedance?..................................... 18
6．3 Automatic over temperature cut out...................................... 18
6．4 The loop impedance test....................................................... 19
6．5 Loop impedance at 3 phase equipment................................ 20
7．Prospective Short Circuit Current (PSC) tests................................ 21
7．1What is Prospective Short Circuit Current?........................... 21
7．2Testing Prospective Short Circuit Current............................. 21
8．RCD Tests...................................................................................... 22
8．1 Purpose of RCD Test............................................................ 22
8．2 What does the RCD test really do?....................................... 23
8．3 Uc Test................................................................................. 23
8．4 Uc Testing............................................................................ 23
8．5 RCD testing.......................................................................... 23
8．6 Testing RCD's used to provide supplementary protection.... 24
8．7 Testing time delayed RCD's.................................................. 25
8．8 Testing DC sensitive RCD's.................................................. 25
9．The external earth terminal............................................................ 26
10．General........................................................................................... 27
11．Battery replacement....................................................................... 27
12．Fuse replacement........................................................................... 27
13．Servicing......................................................................................... 28
14．Case and Strap assembly...............................................................29
CONTENTS