User guide

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
5．1．5Total 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
6．1Voltage 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......................................................17
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
7．4Testing RCDs used to provide supplementary protection.... 22
7．5Testing 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