Greenlee BLL-200 Manuel D'instructions page 13

Operation (cont'd)
Scanning Procedure
After the power is turned on, the receiver's sensitivity starts out at maximum. A microproces-
sor checks the signal strength 25 times per second, and lowers the receiver's sensitivity as
necessary — allowing the receiver to home in on the areas where the signal is strongest. After
several passes over the buried line and several adjustment cycles by the microprocessor, the
receiver's sensitivity may become so low that it loses the signal completely. When this
happens, press the Signal Reset button to return the receiver to its highest sensitivity.
Starting approximately 3 to 5 meters (10 to 15 feet) from the transmitter to establish a
reference, use a side-to-side motion to sweep or scan the area. After finding the signal,
proceed to scan along the length of the buried line. Monitor the receiver's LCD and lamps:
• The LCD will show a number or two dashes. The number, from 01 to 99, indicates the
relative strength of the signal from weakest to strongest. Dashes indicate that the receiver is
beyond the range of the signal.
• Use the Signal Strength lamps to remain centered over the buried line.
• The automatic gain control continuously adjusts the sensitivity of the receiver. If you lose
the signal completely, reset the sensitivity to maximum by pressing and releasing the Signal
Reset button.
BLL-200
13