Megger DET2/3 - Test Methods: ART and Three Terminal; Four Terminal ART Lead Set-up; Three Terminal Test Lead Set-up

DET2/3
24
Test methods and set-up
Four terminal ART test lead set-up
C1
CAT IV 300V
P1
P2
C2
E
ES
S
H
I
V
E
X
Y
V
MVC1010 MVC1010
MCC1010
I
C1 (E)
P1 (ES)
C2 (H)
P2 (S)
100%
62%
Three terminal test lead set-up
G
F
V
I
C1 E
E/X
CAT IV 300V CAT IV 300V CAT IV 300V CAT IV 300V
Y
V
P1 ES P2 S C2 H
15 m to 25 m 15 m to 25 m
P1 P2 C2
Important: The current stake / pin, potential spike and earth / ground electrode must be placed in a straight line.
Important: When running test leads out to each remote stake / pin, take care not to lay them close to each
other. This is to minimise the effect of mutual inductance.
Determine the earth electrode test lead resistance
The earth electrode test lead resistance can be determined separately.
1. Remove the test lead from the earth electrode and connect to the C2 and P2 terminals.
2. Press test.
The lead resistance can then be deducted from the earth resistance measurements.
This procedure is not required if the C1 and P1 terminals are connected by separate test leads.
Note: The result for a three terminal test will include the resistance of the test lead used to connect to the earth
electrode under test. The resistance can be measured by connecting the lead to the P1(X) and P2(Y) terminals,
selecting a 2P test and pressing the test button. This lead resistance can be subtracted from the earth resistance
measurements.
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