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 MIL-HDBK-1023/4
(1) After an open is reported on a load circuit, we can verify the open by reading
the resistance across the load as illustrated in Figure 43. As you can see, the load is open and the
megger reads a very high resistance, confirming the open on the load.
OPEN
<100M
0
= ON
= DIM
= OFF
MEGGER
Figure 43
Sectional Isolation Method - Megger Confirms Open on Load Circuit
As discussed earlier in this text, when an open is detected, the load should be first checked for
grounds. If grounds are detected, those grounds should be located and repaired. Quite often the
open circuit fault is grounded and locating the open is simplified when the open is grounded on
at least one side of the open fault. The following illustrations and text are based on locating
ungrounded opens in the load circuit.
110
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