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
