165X
Users Manual
34
Measuring Earth Resistance (Model 1653 Only)
.
R
E
apx010f.eps
Figure 18. Earth Resistance Display/Switch and
Terminal Settings
The earth resistance test is a 3-wire test consisting of two
test stakes and the earth electrode under test. This test
requires an accessory stake kit. Connect as shown in
Figure 19.
• Best accuracy is achieved with the middle stake at
62% of the distance to the far stake. The stakes
should be in a straight line and wires separated to
avoid mutual coupling.
• The earth electrode under test should be
disconnected from the electrical system when
conducting the test. Earth resistance testing should
not be performed on a live system.
62% L
L
PE (E)
Earthing rod
under test
N (S)
L (H)
apx014f.eps
Figure 19. Earth Resistance Test Connection
To measure earth resistance
1. Turn the rotary switch to the R
E
position.
2. Press and release T. Wait for the test to complete.
• The primary (upper) display shows the earth
resistance reading.
• Voltage detected between the test rods will be
displayed in the secondary display. If greater
than 10 V, the test is inhibited.
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