Digitrex 3-3000-00a-F manual Finding the Front Negative Locate Point Fnlp from the Drill

®

Finding the Front Negative Locate Point (FNLP)

Locating

4.At the PLL, con- tinue walking away from the drill with the trigger held in; the signal strength

will decrease. When the “+” sign flips to a “–” sign, this is the FNLP. Again, move the receiver forward and backward a little pinpointing the location where the “+/–” signs flip from one to the other.

	Plus
	Changes
	to Minus
Surface of
Ground	Drill
	FNLP

Transmitter

Finding the Front Negative Locate Point (FNLP) from the Drill

5. To find the actual location of the FNLP, turn toward
the left so that the receiver is perpendicular (90°) to
the drill string and move the receiver toward the left
side of the drill string and, again, move the receiver
forward and backward until pinpointing the location
where the “+/–” signs flip from one to the other.		Plus
Mark this spot.		Changes
6. When the trigger is held in at the FNLP (and only		to Minus
the FNLP) the bottom window displays a prediction
of the transmitter’s depth as it would pass under the
FNLP, assuming no change in the pitch of the
transmitter. To distinguish the predicted depth from
the slant distance	(trigger released), the bottom		PLL
window will flash the predicted depth with a solidly
illuminated squiggle (“~”). For receivers that have
pre-5.0 series firmware, the predicted depth feature
is not available.	(see “5.0 Series Firmware
Functions” in the Receiver Section)

RNLP

Fine Tuning

the FNLP

(Walking

Toward Left)

Drill

DigiTrak® Mark III Operator’s Manual 47