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Page 15 of 81
3 vLoc3-Pro Receiver
3.8.3 Null Mode
This uses vertical antennas, and provides a minimum or “Null” response over the center of
the buried line.
The compass (line direction indicator) aligns itself parallel to the direction of the cable
(available in Active modes)
The null mode works well in uncongested areas but is more prone to inaccuracies due to the
eects of eld distortion. This eect can be utilised to detect the presence of distorted elds.
Compare the locate position “Null Mode” with the position “Peak Mode”. If the two positions
do not coincide, this indicates possible distortion. The greater the dierence the greater the
distortion.
Left/right indication arrows are also displayed when in “Null” mode. The arrows indicate the
direction to move the receiver to locate the position of the buried line.
3.8.4 Delta Null
This uses dual vertical antennas. This has the advantage that it provides a sharper response
than the “null” mode and is less aected by distorted elds. All other functions are the same
as the “Null” mode.
3.8.5 Peak with Arrows Response Mode
The peak with arrows mode operates in the same way as the peak mode. It gives the largest
meter deection when directly over the line. However, left/right indication arrows are also
displayed. The arrows indicate the direction to move the receiver to locate the position of the
buried line.
Note:
If the arrows indicated a dierent position for the cable than the peak bar graph position,
this indicates the possibility of a distorted field. Check by taking a depth reading on the
ground and then lift the cable locator a known distance such as 1m (3ft). If the depth does
not increase by this amount it conrms a distorted eld and the data should be treated with
caution.
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