Amprobe Telaris-Earth-Test Earth-Resistance-Tester - Manual (Page 15)

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Earth Resistance Measurement (two-wire method)
The two-wire method consists of measuring the resistance between the earth under test and
a known earth. For this purpose, the PEN conductor of a TN system can be used, for example.
The resistance of the known earth connection has to be subtracted from the measurement
result. This measurement is also feasible in a densely populated or in sealed areas where rods
and auxiliary earth connections may not be installed.
Figure 3: two-wire method
1) Connect earth to be tested with socket (E) and known earth with socket (H), also refer
to fig. 3
2) Turn the rotary switch (13) to the "2 pole" position.
3) Set contact voltage (11) by using key “UL“.
4) If required choose manual frequency selection by using key “auto/man” (16), and
select test frequency with key “f1/f2” (12).
5) Press key "Start" (14).
6) Read the measurement result from the display.
• Also refer to display indication
• After the measurement, selection can be made between display of earth resistance or
measurement current (IM) by using key “Display“(8), depending on the measurement result.
• Possibility to measure conventional resistance by using the grounding resistance
measurement range. For this purpose, connect test leads E and H to the DUT. Test current
is fed via lines E and H, measurement voltage is measured via E and H.
E
PEN
RE R PEN
PAEB30872261:Layout 1 12.12.2007 12:06 Uhr Seite 13