Collecting A Short Line Or Partial Grid; Line Scan Data File Length; Extending The Depth After Collecting Data; Automatic Concrete Type Calibration - Sensors & Software Conquest Series Manual

8-Helpful Hints
When collecting a grid scan, the sensor head has to be pushed slightly beyond (1-2cm) the end
line on the far edge of the grid mat before the survey line stops.
If lines collected during Grid Scans seem to end before the end line on the far edge of grid mat is
reached, or they end more than 1 or 2 centimetres (1 inch) after the end line, recalibrate the
wheel odometer. An inaccurate odometer calibration value may result in poor data positioning
resulting in lines which are too long or too short.
Verify that the grid size and measurement units selected in the Tools menu match the vinyl paper
grid mat being used. For example, Conquest comes with 24 inch imperial grids or 600 mm metric
grids that differ slightly in size.
8.3

Collecting a Short Line or Partial Grid

To stop a Grid Scan line early, press the Enter button.
8.4

Line Scan Data File Length

Line Scan data are saved to a maximum line length of approximately 6.4 m (21 feet). The system
will beep to indicate the maximum length has been reached. If a Line Scan is longer than this
length only the last 6.4 m (21 feet) is saved.
8.5

Extending the Depth after Collecting Data

The system always scans to a depth of approximately 3 feet or 1 meter, regardless of the depth
setting the user has selected on the system. The user depth setting only controls the depth of
data displayed on the screen. The user can change the "Depth" menu item in Line Scan to see
deeper data. To see deeper in Grid Scan mode, the user has to change the "Depth" setting for
the grid on the Grid Scan parameters menu.
8.6

Automatic Concrete Type Calibration

For the clearest images and most accurate depth estimates, it is important that the correct
Concrete Type value be used. In Grid Scan mode, Conquest automatically determines the
Concrete Type for Grid Scan by processing a combination of both the Alpha and Numeric lines.
However, lines should NOT be used for the Concrete Type calculation if they have any of the
following features:
1. Very shallow targets.
2. Targets that are not crossed at a 90% angle; crossing at an angle will result in a
calibration value that is too high.
3. Data with no targets.
4. Complex data with multiple targets close together.
In these cases the user can force the system to determine the Concrete Type using only the
Alpha lines or the Numeric lines or even one specific, user-defined line.
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Conquest