16
WAGON WHEEL – LOCATE FROM OFF TO ONE SIDE
Sometimes a microphone cannot be placed over the fault because of an obstacle.
The approximate position of the fault can be located by triangulation.
One microphone is set in place, and called the pivot microphone. The second
microphone is placed 30” from the first microphone, but closer to the assumed
position of the fault. The direction to fault LED for the second microphone will indicate
when the thump takes place.
Leaving the pivot microphone in place, move the second microphone back in very
small increments until a spot is found where both direction to fault LED’s indicate the
thump occurred.
Draw an imaginary line across the two microphone handles. From the center point of
the imaginary line and half way between the two microphones, draw a line pointing
at the cable route/fault (90 degrees from the imaginary line). Each line pointing to the
cable route/fault becomes a spoke to our “wagon wheel”.
Move to a new location and repeat the above locate with new spokes. Where the
spokes cross will be the cable fault. If possible, a third position locate can be made, a
third spoke will either confirm the locate or show that an error on one of the previous
spokes has been made.
See Figure 12
Figure 12
Summary of Contents for S.D.A.D.II
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