MI 3101 EurotestAT: Safety and operational considerations
Warnings and notes
9
Z-LOOP
Fault loop impedance measurement (protection: FUSE or no protection ---) trips-out
the RCD. Use the
Z-LOOP
Impedance, Protection: RCD
option to prevent the trip-
out.
Fault loop impedance
function with selected RCD protection takes longer time to
complete but offers much better accuracy then R
L
sub-result in
RCD
:
Uc
function.
Specified accuracy of tested parameters is valid only if mains voltage is stable
during the measurement and no additional operating circuits are connected in
parallel.
L and N test terminals are reversed automatically according to detected terminal
voltage.
Z-LINE / Voltage drop
Measurement of Z
Line-Line
with the instrument test leads PE and N connected
together will generate warning of dangerous PE voltage when the
TEST
key is
touched but measurement is not prohibited.
Specified accuracy of tested parameters is valid only if mains voltage is stable
during the measurement and no additional operating circuits are connected in
parallel.
L and N test terminals are reversed automatically according to detected terminal
voltage.
Earth resistance
High currents and voltages in earthing could influence the measurement results.
High resistance of S and H probes could influence the measurement results. In this
case, indications Rp and Rc appear in the message field. There is no pass / fail
indication in this case.
Resistance of E measuring wire is added to the measurement result of resistance to
earth. Use only standard test accessory without extension lead for E probe.
Line tracer
Receiver R10K should always be in IND mode when working with the MI 3101
instrument.
When dealing with complex installations (long conductors or more current loops
connected in parallel), it is advisable to disconnect parts of the installation that are
not of interest at that moment. Otherwise the test signal will spread all over the
installation and the selectivity can fall to an unacceptable level.
