Fig.1 DET5/4 Features and controls 8
Fig.2 A method of connection where fault
conditions may occur 9
Fig.3 Low battery voltage indication 10
Fig.4 High Current spike resistance warning 11
Fig.5 Excessive ‘Noise’ warning 11
Fig.6 Reverse polarity indication 12
Fig.7 Fall-of-Potential method for measuring
resistance of an earth electrode 15
Fig.8 Fall-of-Potential method using single
lead to the earth electrode 16
Fig.9 Resistance areas associated with
electrode and Current spike 17
Fig.10 The 61,8% Rule method 17
Fig.11 Connection for Slope method
Fig.12 Resistance curve from Slope method
tests 19
Fig.13 Possible results from several Slope
method tests 20
Fig.14 ‘Dead’ earth testing 21
Fig.15 Test spike positions for BS7671
(16th Edition IEE Wiring Regulations 22
Fig.16 Determining ‘Touch’ potential 23
Fig.17 Determining ‘Step’ potential 24
Fig.18 Soil resistivity measurement 26
Fig.19 Resistivity calculation Nomogram 27
Fig.20 Continuity testing 28
Fig.21 Block diagram of instrument circuit 29
Fig.22 Instrument Accessories 34
Illustrations
4
DET 5/4R Battery Charger Power cord
If the power cord plug is not suitable for your type of socket outlets, do not use an adaptor. You should use a
suitable alternative power cord, or if necessary change the plug by cutting the cord and fitting a suitable plug.
The colour code of the cord is:
Earth (Ground) Yellow / Green
Neutral Blue
Phase (Line) Brown
If using a fused plug, a 3 Amp fuse to BS 1362 should be fitted.
Note: A plug severed from the power cord should be destroyed, as a plug with bare conductors is hazardous in
a live socket outlet.
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