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3 Using the vLoc3-5000
3.5 Searching (sweeping) an Area in the Peak Mode
Buried utilities may be parallel to each other and frequently they cross
the area being searched at various angles and depths.
As the locator antennas response is directional (using the traditional
screen), it is important to search the area in the same or similar pattern
as shown. This orients the antennas in a way that will locate any signals
being radiated from the buried utility.
Once a response is found, trace pinpoint and mark the utility. Searching
an area in this way is generally but not exclusively done in the Peak
mode using passive locating.
3.6 Searching (sweeping) an Area in the Omni-Peak Mode
Searching in the Omni Peak mode is very similar to the Peak mode,
except that it is only necessary to sweep an area in one direction. A zig-
zag motion is enough rather than a full grid action because the locator
will respond to a signal from a line in any direction. It has the benefit of
cutting the sweep time in half.
3.7 Tracing a Buried Line
Where possible trace out from the transmitter connection point. Having
pinpointed the line, hold the locator vertically and in front of you with
the compass line indicator pointing forward/back. Start by moving the
locator left to right/right to left over the line. Keep the movement over
the center of the line, i.e., the largest meter response, adjusting the gain
when necessary. Whenever practical it should be traced to the point that
provides additional confirmation of what type of service is being located,
i.e. a telephone pedestal, a manhole cover, etc.
3.8 Depth & Current Measurement
If the depth measurement feature is activated it is possible to take depth
measurement estimations. To take a depth measurement first pinpoint
the position of the line. Place the vLoc3 receiver's tip on the ground,
making sure it is vertical and across the line, i.e., the compass indicating
Forward/Back. Momentarily press the “
i
” button. The screen will change
to a screen similar to the one to the right.
Log
2
0.54m
163mA
50°42′59.90570′′N
3°26′35.54358′′W
27.50m
0
SD
163mA
If Omni mode is selected, the locator's orientation is not important, but it is still necessary to pinpoint the line accurately before
taking a depth measurement.
