Greenlee BLL-200 Manuel D'instructions page 12

Operation (cont'd)
INDUCTIVE MODE
1. Place the transmitter on the ground, over the object to be traced. Align the transmitter so
that the buried line runs in the same direction as the arrow on the transmitter labeled
"LINE DIRECTION" .
2. Set the switch to INDUCTIVE MODE. The POWER lamp will flash.
Notes:
(1) If the direction of the buried object is not known:
• Turn off the transmitter and try using the receiver alone, in Passive Mode; the
signal will be strongest when the T-shaped antenna is perpendicular to the buried
line.
• Experiment by rotating the transmitter until the receiver, in Trace Mode, picks up
the signal. Continue to rotate the transmitter until the signal detected by the
receiver peaks and begins to decline. The transmitter is aligned properly with the
signal when the signal is strongest.
(2) When using the inductive mode, the receiver may be air coupled to the transmitter.
Air coupling—the reception of the signal directly through the air, and not through the
buried object—will cause false readings. This can occur when the receiver and
transmitter are less than 15 meters (50 feet) apart.
To verify that the receiver is not air coupled, position the receiver directly over the
buried line and raise the antenna straight up.
• If the signal drops off smoothly, the receiver is not air coupled.
• If the signal strength remains the same or increases, the receiver is air coupled. To
remedy this, reposition the transmitter or move farther away from the transmitter.
(3) Since the inductive mode provides the lowest signal to the buried object, it may be
helpful or even necessary to reposition the transmitter along the buried line during
the trace.
The Receiver
1. Extend the T-shaped antenna and clamp it into place.
2. Set the mode switch to TRACE.
3. Turn the power ON. The Signal Strength LEDs will illuminate.
Optional: Set the speaker volume to Off, Low, or High.
4. Scan the area for buried lines. See Scanning Procedure.
12