DL9110 / DL9118
Operating Instructions
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5.9 Non trip Earth Loop Impedance / Line Impedance
The DL9110 / DL9118 will only allow the Earth Loop
Impedance test to be performed if the correct voltages
are detected between line-earth (L-PE illuminated), line-
neutral (L-N illuminated) and neutral-earth (N-PE
not
illuminated).
Rotate the rotary switch until Zs Non Trip is selected. Functions keys
F1-F4 have are used to select the options below:
F1
F2
F3
F4
L-PE loop/
L-N loop
select
Not used
Not used
Auto Start
Note: When the
Zs Non Trip
switch position is selected, the
DL9118 will default to the last used setting, even if it has
been switched off.
L-PE/L-N (F1)
Press the function key F1 to select either the Earth Loop Impedance
test (L-PE) or the Line Impedance test (L-N).
Auto Start (F4)
When Auto start is activated the AUTO icon is shown on the display.
Loop measurements will automatically start approximately 4s after the
DL9110 / DL9118 is connected to correct mains supply via a mains
plug or the test probes. The Auto Start function remains enabled if the
switch position is changed or the DL9110 / DL9118 is powered off. To
disable the Auto Start function press F4.
Note: If the mains supply is removed with the 4s countdown the
loop test will not start.
Note: If the mains power is removed during the loop measurement,
the test will terminate and the display will show “RCD” to
indicate that power has been removed.
To begin the test, press and release the TEST key or select Auto Start
using F4.
During the test, progress is shown by the rotating progress icon. When
the test is complete, the loop measurement is shown in the primary
