Resistance Measurement Low-Ω - BEHA Unitest Telaris ISO Plus Mode D'emploi

PTDB90690001.qxd:PTDB9069-02.qxd
6.2 Resistance Measurement LOW-Ω
The UNITEST TELARIS ISO plus generates a test
voltage at the connection socket LOW-Ω (10). A
current-voltage measurement is used to determine
the respective resistance. The measurement is used
to check protective earth conductors, ground con-
ductors, or equipotential bonding conductors for
low-ohm continuity.
Prior to any resistance measurement, it must
be ensured that the system parts to be tested
are not live. Failure to respect this prescription
can lead to instrument damage.
Prior to any resistance measurement it is pos-
sible to compensate the test leads, please refer
to section 6.2.1.
Set the measurement function selection dial
(19) to measurement function "LOW-Ω".
Connect the red test lead to the "LOW-Ω"
socket and the black test lead to the "COM"
socket.
Connect the test leads to the UUT.
Press the "Start" key (20) to start the mea-
surement.
Read the measurement value displayed on
the screen.
The measurement value remains displayed
until starting a new measurement procedure or
until selection of a different measurement
range.
Erroneous measurements results may be gen-
erated by impedance installed in parallel of ad-
ditional operation current circuits and by com-
pensation currents.
02.10.2008 15:37 Uhr
External voltage protection for LOW-Ω measure-
ment range
If a external voltage of maximum 600 V is connect-
ed by mistake to the LOW-Ω measurement socket,
the LOW-Ω measurement will not be carried out.
The instrument display indicates +"UEXT" (please
also refer to chapter 10.0).
For voltages > 600V AC/DC the internal fuse will
trip.
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Measurements
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