MI 3101 EurotestAT: Measurements
Insulation
46
L1
L2
L3
N
PE
L
PE
N
L/L
1
N/L2
PE/L3
mains voltage
switched off
loads disconnected
Figure 5.3: Application of plug commander and universal test cable for insulation
resistance measurement (TEST: ‘L-PE,N-PE’, ‘L-N,L-PE’, ALL)
Insulation resistance measuring procedure
Select the
INSULATION
function.
Set test
parameters
.
Enable and set
limit
value (optional).
Disconnect
tested installation from mains supply (and discharge tested insulation).
Connect
test cable to the instrument and tested item (see figures 5.2 and 5.3).
Press the
TEST
key for measurement (keep pressing for continuous
measurement).
After the measurement is finished wait until tested item is discharged.
Store
the result (optional).
Figure 5.4: Examples of insulation resistance measurement results
Displayed results:
Rln ..........Insulation resistance between L (+) and N (-).
Rlpe ........Insulation resistance between L (+) and PE (-).
Rnpe .......Insulation resistance between N (+) and PE (-).
Um ..........Test voltage(s) – actual value(s).
Note:
Follow the correct test wiring as indicated in terminal voltage monitor
when the particular insulation test is selected. If only two test wires are
connected, and L-N, L-PE or N-PE test is selected, then technical
specification for INSULATION ALL applies.
