46
9.6 4810 Probe for Pinpointing and Depth Estimation
The long, pointer like design of the 4810 Inductive Probe provides a much sharper Receiver
response than the standard Receiver antenna mounted on the Receiver housing. Because it
can be easily held close to the ground, the Probe provides greater accuracy, especially in the
presence of adjacent conductors, for pinpointing the location and estimating the depth of a
conductor. The 4810 Probe works only in the NULL
method.
To estimate the depth of a buried conductor:
1 Locate and mark the position of the targeted conductor.
2 Plug the 4810 Inductive Probe into the AUX INPUT on the 480BB Receiver.
3 Turn the 480B Receiver SENSITIVITY all the way up and turn the RANGE to "HIGH".
The thumb knob on the 4810 Probe will then control the 480B Receiver sensitivity.
4 Turn the 480B Receiver MODE SWITCH to "ACTIVE".
5 Adjust the 4810 Inductive Probe SENSITIVITY as needed, keeping it as low as possible
to sharpen the Receiver response.
6 Use the same triangulation procedure as described in Section 4.5 Estimating the Depth of
a Conductor. Tilt the 480B Probe to a 45 degree angle as indicated by the bubble at the
base of the Probe handle and then move off to the side of the conductor. When the
conductor is "located" a second time with the Probe at a 45 degree angle, mark the
location on the ground. The distance between the two marks is equal to the depth of the
conductor. See Figure 9-6.
Figure 9-6: Estimating Conductor Depth with the 4810 Probe
