Measuring Depth And Current - Vivax vLoc-9800 User Handbook Manual

8 Using the vLoc-9800
8.3.8

Measuring Depth and Current

Pinpoint the cable as described in "Pinpointing cable", with the receiver in line with and directly above the
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buried line – measure the depth (d) by pressing "i" pushbutton briefly. Current will be displayed at the
same time as the depth.
Be careful when locating in congested areas or close to bends or tee's, they may be inaccurate due to
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distorted fields.
An alternate method of verifying depth (D) is triangulation which can be done in the "Peak" modes
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Measuring the signal current. Pinpoint the line as for measuring depth. The current can be displayed by
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briefly pressing the "i" pushbutton. Depth and current will be displayed the signal from the transmitter will
attenuate with distance. The further from the transmitter the less signal will radiate from the buried line.
By locating at several points along the buried line you will identify an approximate rate of signal loss
(beware that where a pipe or cable divides the signal will reduce more rapidly). If the signal current at the
point you are pinpointing is different from the trend would suggest, check to confirm that the correct cable
is being located. To do this return to a point where the current is as expected and very carefully trace the
line to the new location checking regularly that the current has not changed significantly. A sudden
change in current may be caused by straying onto an adjacent line.
WARNING
NEVER mechanically dig over the path of a buried pipe or cable. ALWAYS dig
carefully.
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