Operation Manual

MI 3121H Smartec 2,5 kV Insulation / Continuity Insulation resistance
22
Test circuits for insulation resistance
L1
L2
L3
N
PE
mains voltage
switched off
closed
switches
loads disconnected
Figure 5.2: Connection of 2-wire test lead
L1
L2
L3
N
PE
mains voltage
switched off
closed
switches
loads disconnected
Figure 5.3: Connection of optional 3-wire test lead (A 1319)
Insulation resistance measuring procedure
 Select the INS function using the BACK / NEXT keys of function selector.
 Set the required test voltage (Press the TAB key then use arrows).
 Enable and set limit value (optional).
 Disconnect tested installation from mains supply (and discharge insulation as
required).
 Connect test lead to the top of the instrument and to the item to be tested (see
Figure 5.2 and Figure 5.3).
 Press the TEST key to perform the measurement (double click for continuous
measurement and later press to stop the measurement).
 After the measurement is finished wait until tested item is fully discharged.
 Store the result by pressing the MEM key (optional).