Frequency Hz (LT320 and LT330) 16
Phase sequence (LT320 and LT330) 16
Test result storage (LT330 only) 17
Replacing batteries and fuses 18
Low battery warning symbol 18
To replace batteries 18
Fuse blown indication 19
Auto power down 19
Preventive maintenance 20
Technical specification 20
Basic and service errors 22
Accessories and equipment 23
Repair and Warranty 24
Symbols used on the instrument are:
G Caution: refer to accompanying notes
t Equipment protected throughout by Double
Insulation (Class II)
c Equipment complies with current EU directives.
Equipment complies with ‘C tick’ requirements
CONTENTS
3
Safety warnings 3
Introduction 4
General description 5
Case contents 7
LCD display 6
Front panel 6
Connection panel 7
Lid open/closure 7
Preparations for use 8
Batteries 8
Preliminary test lead check 8
General operating instructions 8
Display warning symbols 8
Setup procedure 9
Reverse polarity or line/neutral swapping 9
Test leads 9
Test lead connection. 10
LED indicators 10
Loop testing 11
Non-tripping loop test [No Trip] 11
Hi current loop test [Hi] 11
Phase-Earth loop impedance (not at a power socket): 12
Phase-Neutral or Phase-Phase loop impedance 12
Prospective fault current display [PFC] 12
Error messages 12
Possible sources of error 13
maxZ (LT320 only) 14
Deriving R1 + R2 (LT320 and LT330) 14
Voltage measurement 15
Phase to earth voltage measurement 15
Phase to Phase voltage measurement (LT320 and LT330) 15
N13117
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