MI 3311 GammaGT
Single test
31
5.2.3 Insulation resistance
The insulation resistance test checks the resistance between live conductors and earthed
(or isolated) accessible metal parts of a device under test. This test can disclose faults
caused by pollution, moisture, deterioration of the insulation material etc.
The instrument measures the insulation resistance between:
The mains test socket (L+N) and PE / (S/EB1) terminals.
This function is primarily intended for testing Class I appliances.
Figure 5.7: Insulation menu
Test parameters for insulation resistance measurement
OUTPUT
Test
voltage
[250 V, 500 V]
LIMIT
Minimum resistance
[0.01 M
, 0.10 M
, 0.25 M
Ω
,
0.30 M
, 0.50 M
,
1 M
, 2 M
, 4 M
, 7 M
, 10 M
, --- M
]
TIME
Measuring time
[2 s, 3 s, 5 s, 10 s, 30 s, 60 s, 120 s, --- s]
Test circuits for Insulation resistance measurement
Figure 5.8: Measurement of insulation resistance
Insulation resistance measurement procedure
Select the INSULATION function.
Set the test parameters.
Connect device under test to the instrument (see figure 5.8).
Press the TEST key for measurement.
Store the result by pressing MEM key (optional).
Figure 5.9: Examples of Insulation resistance measurement results
Displayed results:
Main result ............. Insulation resistance
