Aqua-Tronics S.D.A.D.II, Operator'S Manual

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13
SETTING THE LOGIC TRIP SENSITIVITY
The logic trip sensitivity control is pre-set at power on. This setting can be used on the
majority of cable faults. Touching any of the controls on the LCD will take the user to
the adjustment screen.
See Figure 9
.
The user can increase or decrease any of the SDAD
II
Parameters from the default
settings. To return to the default settings, touch the reset button above the acoustic
sensitivity control on the main screen.
“ZEROING IN” ON THE FAULT
When a direction to fault LED lights up at the same time a ballistic impulse indicator
indicates a “thump” has taken place, a time will be displayed in the “TIME/DEPTH”
information window if the instrument mode has been set to “TIME =---MSC”. This
number is clocked from when the “thump” pulse passed the instrument and the first
microphone heard the sound.
If the Time displayed is a large number, the operator can move the microphones 10
to 15 feet for a new reading. If the LCD time is a small number, the fault is very close
and the movement of the microphones should be a very short distance. This will vary
greatly depending on the locating conditions. The distance to move microphones will
become easier and more exact with experience.
When the direction to fault LED indicates the fault to be in the reverse direction, the
fault has been passed and the operator needs to reverse his/her direction. Move
both microphones in the reverse direction the same approximate distance as the
microphones are separated. (If the microphones are 24 inches apart, move both
microphones 24 inches in the reverse direction) This will keep the operator from leap-
frogging over the fault. Make these movements until once again; direction to fault
LED indicates a reversal in direction.
Figure 9