3M 2550 Manuale Utente

 36 

78-9000-0192-2 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 [5] 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 [3] down until 

the Bar Graph [11] ([10] for 2550 locator) 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 2550 locator).

 

− The Bar Graph [11] ([10] for 2550 locator) will close when the unit detects 

a signal, and the arrows will reverse.

 

− Adjust the Gain [3] down if the Bar Graph [11] ([10] for 2550 locator) 

closes completely.

 

− The Signal Strength [9] ([8] for 2550 locator) 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 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.

from the transmitter. When using higher frequencies, this decline is more evident.
Step 16. Adjust the gain so that the Bar Graph [11] ([10] for 2550 locator) 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.