The
receiver can be used for the traditional triangulation
method to determine the approximate depthof a
target as illustrated in the above figure. However,
when using this method it is necessary to take
into account the fact that the center of the cable-sensor
is located 11 inches up the receiver tube from
the black tip. When the position of the target
has been determined by the null, mark the spot
(#1) on the ground. Hold the receiver tip on the
ground at this spot, slant the instrument at a
45-degree angle and slowly move directly back,
to one side, from the target until a second null
is obtained.
Now mark a spot (#2) on the ground
that is directly below a point 11 inches up the
receiver tube from the black tip. Measure the
distance between spot #1 and spot #2. This measurement
indicates the approximate depth of the target.
NOTE: You should always take a depth reading on
both side of the line. IF the measured distances
between #1 and #2 on both sides of the line are
not the same, there is a good chance that a nearby
line is causing the two measurements to be different.
Move further along the line and repeat the depth
reading procedure until the measurements are the
same on both sides of the line.
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