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15. Measure the depth and current of each point to identify the target path. The depth
of the target path should be as expected and the relative current should compare
to the relative current that is alternately flashing with the frequency value on the
transmitter.
Note: The relative current reading will decrease steadily as the locator moves away
from the transmitter. When using higher frequencies, this decline is more evident.
16. Adjust the gain so that the bar graph responds to the target path (open when off
path, almost completely closed when directly over target).
17. Trace the cable/pipe at a slow walk while moving the receiver in a side-to-side
motion, keeping the receiver perpendicular to the ground.
18. Measure the depth and current occasionally to verify target path.
Note: In order to measure the depth and current accurately, the operator must
pinpoint the target pipe or cable, and the receiver handle should be in-line with the
target path.
− While in Dir Pk mode, find the highest Signal Strength [10].
−
Lower the tip of the receiver to the ground. Twist the receiver left and right
while watching the signal strength.
− When the highest Signal Strength [10] reading is displayed, the handle of the
unit is in line with the target pipe or cable.
Occasionally, a signal will appear on adjacent cables or pipes. Compare the relative
and actual current readings (value that is under the relative current value and in mA
units) over each path to help determine the target path. Current readings will be
significantly less on the adjacent cable compared to the target path.
19.
As tracing proceeds, remember that the most powerful signal is near the transmitter.
As the receiver gets farther away from the transmitter the
Signal Strength
[10]
decreases. It may be necessary to readjust the gain as needed to ensure that there is
adequate signal for the receiver to operate. Press the
Gain
[4] up or down when the
bar graph is no longer visible (too little signal) or when the bar graph is closed (too
much signal).
20.
Trace the path until you reach a logical termination point (i.e.: terminal, meter,
cabinet, etc).
11. Locating Active Duct Probes (Sondes)
1. Press
On/Off
[1] on the receiver.
2. Press
Locate/OK
[5].
3. Press
Cable/Pipe
[SK].
4. Press
Mode
[SK Toggle] to select Special Peak (Spl Pk).
5. Press
Freq
[SK].
6. Press
Active
[SK Toggle] to select the 33kHz frequency (for a 33 KHz Sonde
or Active Duct Probe (ADP)).
7. Press
Locate/OK
[5].
