Fluke Fiber Viewer FT140 - Manual (Page 8)

Single-Pole Phase Test
• To carry out single-pole phase tests ouch the
Accessible electrode (11) and connect instru-
ment test probes to unknown contact.
• The single-pole phase test starts at an AC
voltage of approx. 100V (pole > 100V AC).
• When using single-pole phase tests to deter-
mine external conductors the display function
may be impaired under certain conditions
(e.g. for insulating body protective equipment
on insulation locations).
• The single-pole phase testing is not appro-
priate to determine whether a line is live or
not. For this purpose, the double-pole voltage
test is always required.
The LED (5) is illuminated in the display.
Voltage Test with RCD Trip Test
(not T140 VDE)
During voltage tests in systems equipped with
RCD circuit breakers, a RCD switch can be trip-
ped at a nominal residual current of 10mA or
30mA by measuring the voltage between L and
PE.
The RCD trips.
To avoid RCD tripping a test has to be car-
ried out between L and N during approx.
5s. Immediately afterwards, voltage tes-
ting between L and PE can be carried out
without RCD tripping.
Fluke T100/120/140
Users Manual
8