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MI 3108 EurotestPV Safety and operational considerations
9
Continuity measurements should only be performed on de-energized objects!
Parallel loops may influence on test results.
Testing PE terminal
If phase voltage is detected on the tested PE terminal, stop all measurements
immediately and ensure the cause of the fault is eliminated before proceeding
with any activity!
Notes related to measurement functions:
General
The indicator means that the selected measurement cannot be performed
because of irregular conditions on input terminals.
Insulation resistance, continuity functions and earth resistance measurements
can only be performed on de-energized objects.
PASS / FAIL indication is enabled when limit is set. Apply appropriate limit value
for evaluation of measurement results.
In the case that only two of the three wires are connected to the electrical
installation under test, only voltage indication between these two wires is valid.
Insulation resistance, Insulation resistance of PV systems
Insulation resistance:
If a voltage of higher than 30 V (AC or DC) is detected between test terminals,
the insulation resistance measurement will not be performed.
Insulation resistance of PV systems:
Different pre-tests are carried out. If conditions are proper and safe the
measurement will be be continued.
Otherwise or or message is displayed.
The instrument automatically discharge tested object after finished
measurement.
A double click of TEST key starts a continuous measurement.
Continuity functions
If a voltage of higher than 10 V (AC or DC) is detected between test terminals,
the continuity resistance test will not be performed.
Compensate test lead resistance before performing a continuity measurement,
where necessary.
RCD functions
Parameters set in one function are also kept for other RCD functions!
The measurement of contact voltage does not normally trip an RCD. However,
the trip limit of the RCD may be exceeded as a result of leakage current flowing
to the PE protective conductor or a capacitive connection between L and PE
conductors.
The RCD trip-lock sub-function (function selector switch in LOOP position) takes
longer to complete but offers much better accuracy of fault loop resistance (in
comparison to the RL sub-result in Contact voltage function).
9


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