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4 Using the vLoc3-Pro
Also note that the signal will radiate out to the side of the transmitter as well as below. For this reason, it is recommended that
when applying a signal using the induction method, a distance of at least 20m is kept from the transmitter when pinpointing or
taking depth readings. Locating closer than 20m is possible but the operator should be aware that the signal directly received
from the transmitter may be strong enough to inuence the results.
When using the induction mode, avoid placing the transmitter over metallic manhole covers as this will severely reduce the
eectiveness of the transmitter and in extreme cases cause damage to the transmitter’s circuitry.
4.4 Locating Active Signals
These instructions assume that the Classic Screen is selected and Peak with Arrows mode is selected for the antenna
conguration.
Apply an active signal to a line using one of the methods outlined above in section 4.3, active locating.
Set the antenna conguration to “Peak with arrows”.
Switch on the receiver and select a desired locate frequency matching the transmitter setting.
Note that the screen will now show the addition of a compass (line direction indicator). In the presence of a locate signal the
compass will align itself parallel to the line being located. This ensures that the operator is aware of the direction of the line.
69.1
640Hz25dB
Hold the locator vertically and rotate it on its axis until the compass indicates Forward/Back as above.
Adjust the sensitivity control so that the display indicates approximately 50%. Keeping the vLoc3-Pro vertical, move to the side
slightly. If the bar graph increases, you are moving toward the line. If it decreases, you are walking away from it. Move toward
the line as indicated by the direction arrows, until a maximum signal is achieved. It may be necessary to reduce the sensitivity to
keep the bar graph on scale. This is normal and should be expected. Try to keep the vLoc3-Pro vertical and avoid swinging it as
this may create false readings.
Move the locator side to side to ensure a maximum signal is detected. Use the peak level indicator to assist.
With the maximum signal found and the compass running Forward/Back, the vLoc3-Pro is now directly over the line and exactly
across it.
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