15
If the cable route was off to one side of where the operator thought it was, the pivot
microphone would not prove all four readings. Moving the microphones in the new
direction until a “NULL” point is found will require the 90 degree readings to be taken
again because a new spot was found for the pivot microphone.
See Figure 11 .
THE LED FOR THE PIVOT MICROPHONE WILL LIGHT AT EACH OF THE FOUR
READINGS IF THE FAULT IS UNDER THE PIVOT MICROPHONE ON THE 90
DEGREE WALK AROUND.
Figure 11
What was thought to
be the cable route
Actual cable route
CORRECT
INCORRECT
Actual cable fault
What was thought to
be the cable fault
Where microphones
were placed for 90°
walk around
Summary of Contents for S.D.A.D.II
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