Megger MIT400 Series - Page 15

15
DAR = 60 second value/30 second value
During all insulation tests the symbol will flash indicating that a test voltage is present.
(a) Insulation resistance testing – timed procedure (not MIT400, MIT405 or MIT480).
(Refer to Figures 7)
1. Connect the test probes to the isolated circuit under test.
2. Turn the instrument ‘O
O N‘
by rotating the selector switch to the required test voltage
position either 50 V, 100 V, 250 V, 500 V or 1 kV.
3. Select the timed test (t) by pressing ‘PI/DAR/t’ function button repetitively until the
desired function is displayed.
Note: the test type defaults to insulation resistance when the range switch is moved.
See figure 7 screens B, C & D.
Figure 7 Insulation resistance – timed modes
Screen B
(
Indicatin
g
a PI test
)
Screen C
(
Indicatin
g
DAR test
)
Screen D
(
Indicatin
g
timed test
)
Screen A
(Indicating insulation
test mode)
Step 1:
Connect test leads to
circuit
Step 3:
PI, DAR, t or INS
Step 6:
Press TEST to abort if
required
Step 4:
Press TEST and hold
Step 2:
Range selection
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