MI 3100 s, MI 3100 SE
Eurotest
EASI
Safety and operational considerations
9
Earth resistance
If voltage between test terminals is higher than 30 V the resistance to earth
measurement will not be performed.
If a noise voltage higher than approx. 5 V is present between the H and E or S test
terminals,
“
” (noise) warning symbol will be displayed, indicating that the test result
may not be correct!
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 auto-test 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 if a leakage current flows to the PE
protective conductor or if there is a capacitive connection between L and PE conductors.
Z-LINE / Voltage drop
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).
Testing PE terminal
PE terminal can be tested in RCD, LOOP and LINE function selector switch positions
only!
For correct testing of PE terminal, the TEST key has to be touched for a few seconds.
Make sure to stand on non-isolated floor while carrying out the test, otherwise test result
may be wrong!
PE conductor resistance (MI 3100 SE)
The specified accuracy of tested parameters is valid only if the mains voltage is stable
during the measurement.
