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MI 3100 s, MI 3100 SE EurotestEASI Measurements
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5.2 Insulation resistance
The insulation resistance measurement is performed in order to ensure safety against electric
shock through insulation. Typical applications are:
insulation resistance between conductors of installation,
insulation resistance of non-conductive rooms (walls and floors),
insulation resistance of ground cables and
resistance of semi-conductive (antistatic) floors.
See chapter 4.2 Function selection for instructions on
key functionality.
Figure 5.5: Insulation resistance
Test parameters for insulation resistance measurement
Uiso Nominal test voltage [50 V, 100 V, 250 V, 500 V, 1000 V]
Limit Minimum insulation resistance [OFF, 0.01 M ÷ 200 M]
Test circuits for insulation resistance
Figure 5.6: Connection of 3-wire test lead and tip commander
Insulation resistance measuring procedure
Select the R ISO function using the function selector switch.
Set the required test voltage.
Enable and set limit value (optional).
Disconnect tested installation from mains supply (and discharge insulation as required).
Connect test cable to the instrument and to the item to be tested (see Figure 5.6).
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 (MI 3100 SE only).
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