MI 3125 InstaltestCOMBO
Warnings and notes
8
Continuity functions
If voltages of higher than 10 V (AC or DC) is 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.
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 R
L
sub-result in Contact voltage function).
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 autotest sequence (RCD AUTO function) stops when trip-out time is out of
allowable time period.
Z-LOOP
The low limit prospective short-circuit current value depends on fuse type, fuse
current rating, fuse trip-out time and impedance scaling factor.
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.
Z-LINE
In case of measurement of Z
Line-Line
with the instrument test leads PE and N
connected together the instrument will display a warning of dangerous PE
voltage. The measurement will be performed anyway.
Specified accuracy of tested parameters is valid only if mains voltage is stable
during the measurement.
L and N test terminals are reversed automatically according to detected terminal
voltage (except in UK version).
SOCKET test
If necessary compensate test lead resistance before performing SOCKET test.
Consider correct connection of test leads and resistor set Resistance box (A
1195). Parallel resistance paths will influence the test result!
