4.3 Automatic discharge
Following any insulation test, when the TEST button is released, the discharge loop begins to discharge the test piece.
The automatic discharge loop will discharge the unit under test, removing any hazardous voltage introduced by the
insulation test.
During the automatic discharge loop, the lightening symbol will flash and the falling voltage displayed on the left of
the secondary field.
After the automatic discharge loop has finished, the secondary result is displayed in the secondary field again and the
buzzer sounds for a second.
4.4 Insulation Resistance (IR) Test
1. Connect the test leads to the MTR105.
1.1. Press the Information (
) button to view the lead set
up diagram.
NOTE:
when the diagram is displayed a test cannot be
performed. Press Information
(
)
button to return to the test
screen
This test can also be performed with just the red and the black
lead.
2. Connect the test leads to the unit under test.
NOTE:
The connection is for illustrative purposes only
When performing phase to phase measurements, the star or
delta configuration has to be disconnected.
3. Select the required insulation test voltage.
4. The display will show the selected voltage, in this case 500 V.
Insulation Resistance Tests
14
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