"Digging Deeper with the
Sample 3D Motion Mode Performance Graph
graphs] represent Motion Mode "in-air" tests
performed with the same settings for the five White's DFX
loops [(only the graph for the standard 9.5" search
coil is shown in this excerpt)]. Although the
sensitivity level with the PREAMP GAIN
at 2 and the A.C. SENSITIVITY
at 60 is low, the following graphs do
illustrate their "in-air" depth performance relative
to one another.
In heavily mineralized soil, the relative strength of the target signal versus the ground response will favor coils with smaller sensitivity patterns. Also, search coils that may be run with higher sensitivities, without being hampered by electromagnetic interference, will allow better relative performance than what is indicated here.
Note that the minimum depth shown on each graph is 4¼ inches."
© 2004, Jeff Foster