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time to fault. This will greatly reduce false time indication due to random background
noise. A constant background noise could still create problems when the ballistic
impulse is passing by.
As you get closer to the fault, the thump will get louder. Turn down the acoustic
sensitivity control. When the sensitivity control can be reduced to a 16 or less on the
control dial and the thump can still be heard, a second microphone can now be used.
FINDING THE EXACT POSITION OF THE FAULT
CONNECTING AND USING TWO MICROPHONES
a. Connect the second microphone to the electronics by turning the microphone
electronics on.
See Figure 8
.
b. The RED microphone connects to the red LED on the right side of the display
screen and the GREEN microphone will connect to the green LED on the left
side of the display.
c. The ‘Time/Depth information window’ should show both channels “ON”
d. Set both microphones over the route of the cable.
If earth probe microphone spikes are being used in dirt, sand, snow, etc… they
should be separated 24” or more during use. If Tri-Pods are being used on a hard
surface like concrete or asphalt, they should be separated 30” or more during use.
With experience, the operator may find that microphones can be placed much closer
together than indicated. Until the operator is familiar enough with the instrument to
know where the limitations are in different soil or ground conditions in his/her area, it
is recommended that the suggested microphone spacing be followed.
Figure 8
Summary of Contents for S.D.A.D.II
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