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
4
Safety notices 2
Introduction 5
General description 5
Instrument illustrations 6
Preparations for use (all instruments) 8
General operating instructions (all instruments) 9
Replacing batteries and fuses 10
Megger’s ‘Down to Earth’ publication 11
Description of Tests for Models DET3TD, DET3TC and DET4TD 11
Battery 11
Measurement of ground noise voltage 11
Two-terminal resistance measurement 12
Three-terminal ground rod resistance measurement 12
Four-terminal ground rod resistance
measurement (DET4TD) 13
Ground resistance measurement (DET4TD) 13
Calibrating the instrument to the ICLAMP (DET3TC) 14
Measuring ground current with the ICLAMP (DET3TC) 14
Measuring ground resistance with the ICLAMP (DET3TC) 14
Attached Rod Technique (ART) (DET3TC) 15
Measuring ground resistance with the ICLAMP using the
ART (DET3TC) 15
Description of Tests for Model DET3TA 16
Battery-life reading 16
Ground noise voltage measurement 16
Two-terminal resistance measurement 17
Three-terminal resistance measurement 17
Preventative instrument maintenance 19
Technical specifications 19
Repair and Warranty 21
N1311
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