User's Manual

DIGITAL CONTROL INCORPORATED
DigiTrak F5 Operator’s Manual 17
Note If the transmitter pitch exceeds ±30% (or ±17°) and/or the transmitter
depth exceeds 15 ft (4.6 m), the position of the locate line will be
somewhat ahead of or behind the transmitter’s actual position. In these
cases, the depth displayed on the receiver is referred to as the projected
depth. Appendix B on page 37 provides more information regarding this
situation.
Effects of Depth, Pitch, and Topography on Distance Between FLP and RLP
The deeper the transmitter is, the further apart the FLP and RLP will be. The distance
between the FLP and RLP with respect to the location of the LL is also a function of the
transmitter pitch and the topography (for more information, see Appendix B on page 37).
When the transmitter pitch is negative, the FLP will be further from the LL than the RLP (see
following figure). When the transmitter pitch is positive, the RLP will be further from the LL
than the FLP. If the ground surface or topography slopes significantly, the locations of the
FLP and RLP will also be affected with respect to the LL even if the transmitter itself is level.
Effect of Pitch on Distance Between FLP, RLP, and LL
It is possible to calculate depth (for comparison to the receiver’s depth reading) using the
distance between the locate points and the pitch of the transmitter. For additional information,
see Appendix C: Calculating Depth Based on Distance Between FLP and RLP on page 43.
LL
FLP
RLP
70°
Drill
Surface of
ground
Transmitter (negative or
downward pitch)