User's Manual

DIGITAL CONTROL INCORPORATED
DigiTrak
®
SE™ Operator’s Manual 67
Appendix B:
Projected Depth Versus Actual
Depth and the Fore/Aft Offset
What Happens When the
Transmitter Is Steep and Deep?
The signal field emitted by the transmitter, as shown in Figure B1, consists of a set of elliptical signals or
flux lines. The flux lines indicate the position of the transmitter. When the transmitter is level with respect
to the ground, you will find that the locate line (LL) is directly over the transmitter, and the depth displayed
on the receiver is the actual depth. You will also find that the locate points (FLP and RLP) are at equal
distances from the transmitter. The location of the LL is found at the intersection of the ground and the
horizontal component of the flux field, and the FLP and RLP are found where the vertical components of
the flux field intersect with the ground. Some of the horizontal and vertical components are identified by
short yellow lines in Figure B1.
RLP
FLP
LL
Figure B1. Flux Field and Geometry of FLP, RLP, and LL (side view)