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DET5/4D
Megger DET5/4D User Manual
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8
Figure 1. DET5/4 Features
FEA
TURES AND CONTROLS
3
1
⁄
2
digit L.C.D.
4
terminal push button
T
o electrode under test
(3 terminal test)
T
o electrode under test
(4 terminal test)
Battery compartment
(and charger socket
cover
DET5/4R
)
Condition
W
arning l.e.d.s
3
terminal push button
Low Battery indicator point
Ω
and kΩ
range indicator points
T
o Potential test spike
T
o Current test spike
Low Battery and
Range indicator
Condition
W
arning
Alert
7
9
Table of Contents
Safety Warnings
2
Table of Contents
3
Contents
3
Illustrations
4
General Description
5
Applications
7
Fig.1 DET5/4 Features and Controls
8
Live Earth Safety Precautions
9
Conditions May Occur
9
Features and Controls
8
Fig.3 Low Battery Voltage Indication
10
Operation
10
General Testing Procedure
10
Display Symbols
10
Fig.4 High Current Spike Resistance Warning
11
Fig.5 Excessive 'Noise' Warning
11
Setting-Up the Test Spikes Etc
12
Fig.6 Reverse Polarity Indication
12
Basic Test Procedure
13
Battery Charging (DET5/4R)
14
Fitting or Replacing the Battery Cells
14
(Det5/4D)
14
MEASURING TECHNIQUES Testing Earth Electrodes
15
Fall-Of-Potential Method
15
The 61,8% Rule
16
Electrode and Current Spike
17
Fig.10 the 61,8% Rule Method
17
The Slope Method
18
Fig.12 Resistance Curve from Slope Method
19
Tests
20
Fig.13 Possible Results from Several Slope Method Tests
20
Method Using 'Dead' Earth
21
Fig.14 'Dead' Earth Testing
21
BS7671 (16Th Edition IEE Wiring Regulations) Requirements
22
Other Methods
22
Fig.15 Test Spike Positions for BS7671
22
Determining 'Touch' Potential
23
Fig.16 Determining 'Touch' Potential
23
Determining 'Step' Potential
24
Fig.17 Determining 'Step' Potential
24
Typical Variations in Soil Resistivity
25
Line Traverse
26
Fig.18 Soil Resistivity Measurement
26
Calculation of Resistivity
27
Fig.19 Resistivity Calculation Nomogram
27
Continuity Testing
28
Fig.20 Continuity Testing
28
Fig.21 Block Diagram of Instrument Circuit
29
Circuit Description
29
Specifications
30
Fig.22 Instrument Accessories
34
Accessories
34
Chart for Use with Slope Method
35
Repair and Warranty
40
Guide de L'utilisateur
42
Gebrauchsanleitung
52
Guía del Usuario
62
5
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Megger DET5/4D Specifications
General
Brand
Megger
Model
DET5/4D
Category
Test Equipment
Language
English
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