MI 3110 EurotestIM
Measurements
– a.c. LV IT installations
36
Test circuit for automatic measurement
Figure 5.19: Connection for automatic measurement
Automatic measurement procedure
❑
Select
AUTO SEQUENCE
mode from main menu.
❑
Use
TAB
and
/
keys to enable and set
limit
values (optional).
❑
Connect
3-wire test lead or mains measuring cable to the instrument and tested
❑
Press the
TEST
key to start the auto-sequence.
❑
Voltage, line impedance and ISFL tests are performed automatically. When auto-
sequence enters IMD testing function, follow IMD test procedure (see chapter
Testing of insulation monitoring devices (IMD)).
❑
Store
the result by pressing the
MEM
key (optional).
Figure 5.20: Example of automatic measurement result
Displayed results during auto-sequence and saved results:
Voltage:
U12 .......... voltage between phases L1 and L2,
U1pe ........ voltage between phase L1 and PE,
U2pe ........ voltage between phase L2 and PE,
f ............... frequency,
Line impedance:
Z .............. Line impedance,
Isc............ Prospective short-circuit current,
First fault leakage current (ISFL):
Isc1 .......... First fault leakage current at single fault between L1/PE,
Isc2 .......... First fault leakage current at single fault between L2/PE,
