38
78-9000-5020-0 Rev C
Step 12. Set the Frequency and Mode of the receiver.
a. Press
Freq
[SK].
b. Select the same frequency on the receiver
that was selected on the transmitter by
pressing
Active
[SK Toggle].
c. Press
Menu/
OK [6] to save the setting
and return to Locate mode.
d. Press
Mode
[SK Toggle] until Dir Pk is
displayed.
Step 13. Stand away from the suspected target path and adjust the
Gain
[4] down
until
the
Bar Graph
opens completely.
Step 14.
Walk in a wide circle with your back toward the transmitter (about 10 to 15 feet
(3 to 4.5 m) away).
−
Watch the receiver display and listen to the signal. Take note of where the
receiver detects the strongest
Signal Strength
[9] ([8] for 2550E).
−
The
Bar Graph
will close when the unit detects a signal, and the arrows
will reverse.
−
Adjust the
Gain
[4] down if the
Bar Graph
closes completely.
− The numbers on the display will change with the signal strength (smaller, as
you walk away from the target path; larger, as you approach the target path).
−
Make a complete circle around the transmitter. Return to each point in the
circle that the receiver detected.
Step 15. Measure the Depth Current of each 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 of the transmitter.
Note: The Relative Current reading will decrease steadily as the receiver moves away
from the transmitter. When using higher frequencies, this decline is more evident.
Step 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).
Step 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.