User's Manual

Appendix B
DigiTrak
®
SE™ Operator’s Manual 71
Table B4 allows you to calculate the exact projected depth reading as well as the actual depth using a
multiplier. Values for the multiplier, or conversion factor, are provided at different transmitter pitches.
Table B4. Conversion Factors for Calculating Exact Projected Depth or Actual Depth
Pitch →
±10%
(5.7°)
±20%
(11°)
±30%
(17°)
±40%
(22°)
±50%
(27°)
±60%
(31°)
±75%
(37°)
±90%
(42°)
From Actual to
Projected Depth
1.005 1.025 1.06 1.105 1.155 1.212 1.314 1.426
From Projected
to Actual Depth
0.995 0.975 0.943 0.905 0.866 0.825 0.761 0.701
For example, referring to Table B4, if you have a required (actual) depth of 24 ft (7.32 m), you can
determine the receiver’s projected depth reading at a 30% (17°) pitch. You will use the first row of
conversion factors (From Actual to Projected Depth) to select the corresponding value for a pitch of 30%,
which is 1.06. Multiply this value by the required depth, which is 24, and you will find that your receiver’s
projected depth reading at the locate line should display as 25 ft 5 in. (7.75 m)
Using the projected depth displayed on your receiver, you can calculate the actual depth of the
transmitter using the second row of conversion factors. Select the corresponding conversion factor
associated with your pitch value, and then multiply that value by the projected depth. For example, if your
pitch is 30% and your projected depth reading is 24 ft (7.32 m), then you would multiply 0.943 by 24 to
determine that the actual depth of the transmitter is 22.63 ft or 22 ft 8 in. (6.90 m).