NOVA AND NOVA PRO
Safety and operational considerations
6
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
❑
If voltages of higher than 10 V (AC or DC) are detected between test terminals, the
insulation resistance measurement will not be performed.
Continuity functions
❑
If voltages of higher than 10 V (AC or DC) are detected between test terminals, the
continuity resistance test will not be performed.
❑
Before performing a continuity measurement, where necessary, compensate test lead
resistance.
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.
❑
RCD trip-out time and RCD trip-out current measurements will only be performed if the
contact voltage in the pre-test at nominal differential current is lower than the set contact
voltage limit!
❑
The auto-test sequence (RCD AUTO function) stops when trip-out time is out of
allowable time period.
Loop impedance (with No-Trip RCD option)
❑
Isc depends on Z, Un and scaling factor
❑
The current limit depends on fuse type, fuse current rating, fuse trip-out time
❑
The specified accuracy of tested parameters is valid only if the mains voltage is stable
during the measurement.
❑
Fault loop impedance measurements will trip an RCD.
❑
The measurement of fault loop impedance using trip-lock function does not normally trip
an RCD. However, the trip limit may be exceeded as a result of leakage current flowing
to the PE protective conductor or a capacitive connection between L and PE
conductors.
Line impedance
❑
Isc depends on Z, Un and scaling factor
❑
The current limit depends on fuse type, fuse current rating, fuse trip-out time
❑
The specified accuracy of tested parameters is valid only if the mains voltage is stable
during the measurement.
