RECEIVER OPERATION
AVTM651070 Rev B Nov 2006
29
NOTE:
If the display reads
“
Err
”
during a depth measurement, the receiver has
detected a condition that could produce inaccurate readings. Be especially
alert to errors that are caused by inadequate signal current flow. Check
the transmitter hookup and far end ground return access point for loose
connections. Suspect a low current problem when you have to set the gain
to 80 or greater on the bar-graph display. Check to be sure the receiver is
directly over the target cable. If at anytime the display reads
“
CAL,”
contact the factory for further information.
Depth Measurement 45° Angle Method
As a correlation to the depth measurement by push-button method, you can
measure depth using a triangulation method as shown in Figure 15. This
alternative method will also help you determine whether or not there are
interfering nearby cables.
Move to the spot where you want to measure depth and pinpoint and mark the
path of the cable. Then place the foot of the receiver on the ground with the
meter facing up. Adjust the position of the unit until the bubble level on top of
the meter is centered at 45°. Pull the receiver away from the cable path along a
line that is perpendicular to the cable. When the locator indicates a null reading,
mark the location of the foot of the receiver. Measure the distance between the
receiver and the cable path. This distance is the same as the depth of the target
cable or pipe.
You can check for a possible false depth reading caused by nearby buried
metallic objects such as another cable or pipe, sewer line, fence, or railroad track.
To confirm your depth measurement, repeat the above steps on the opposite
side of the pipe or cable. A difference of more than 5 in.(12.7 cm) in the two
depth measurements can mean that there are interfering cables, pipes, or other
objects, and that the accuracy of the depth measurement is less than usual.
Figure 15: Depth Measurements 45° Angle Method
Summary of Contents for L1070
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Page 8: ...AVTM651070 Rev B Nov 2006 iv M...
