5.2 Low-Ohm Resistance Measurement
This measurement is used to check protective earth
conductors, grounding conductors, and equipoten-
tial bonding conductors for low-impedance conti-
nuity. The resistance is determined by current/vol-
tage measurement.
Prior to any Resistance measurement, it must
be guaranteed that no installation parts to be
tested are live.
Prior to any resistance measurement it is pos-
sible to compensate test lead resistance (plea-
se refer to chapter 5.2.1)
Connect 2 test leads to the TELARIS 0100 plus
(sockets L1 and L2).
Plug test probes or crocodile clips onto the test
leads and connect the test leads to the
EUT.
Set measurement range selection switch (32) to
„LOW-Ω" measurement range.
If an external voltage is present, the instrument
displays Uext (5) and attention (1). The Low-
Ohm resistance measurement is then blocked.
The symbol „Uext" (5) disappears if a second
measurement is started without foreign volta-
ge present.
Press the "Start" (26) key. During the measure-
ment the display shows "-”.
Read measurement value on display.
If „>1999 Ω" appears on the display, the resi-
stance is higher than 1999 Ohm.
The polarity of the test current applied may in-
fluence the measurement result by means of
galvanic elements within the EUT. For this rea-
son always repeat the measurement with re-
versed polarity to compare the measurement
results.
The measurement results can be falsified by
parallel connection of impedances of additio-
nal service circuits or by compensating cur-
rents.
It is possible to store the measurement result
by pressing „Store" (27) key.
The instrument automatically remains in con-
tinuous measurement mode when pressing
the "Start" key (26). The measurement lasts
until the "Start” key (26) is released again.
11
Low-Ohm Resistance Measurement
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