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Accordingly, always scan the area crosswise (i.e. in two
scans perpendicular to each other) in order to avoid errors
due to scanning along the length of an object.
NOTE
When several objects are positioned one above the other
in the material being scanned, the object closest to the
surface will be shown in the display. The image of the
object shown in the display may differ from the actual
characteristics of the object concerned. In particular, very
thin objects will be shown thicker than they actually are.
Large, cylindrical objects (e.g. plastic objects or water
pipes) shown in the display may appear narrower than
they actually are.
6.2 Scanning
1.
Switch the tool on.
The display shows the standard screen.
Select the scanning mode that suits the material to
be scanned.
2.
Place the tool on the surface to be scanned and
move it in the required direction (see section 6.1
"Using the tool").
The result of the scan will be shown in the display
after the tool has been moved a distance of at least
10 cm (3.9 in).
3.
In order to obtain correct results, move the tool
slowly over the area to be scanned.
NOTE If the tool is lifted away from the surface
while making the scan, the most recent reading is
shown in the display. The word "Hold" appears in
the sensor area of the display. The scan restarts
when the tool is brought back into contact with
surface and moved again or the "Measure" button
is pressed.
NOTE The approximate depth and the object mater-
ial category shown in the display refer to the object
shown in black in the sensor area of the screen.
The status LED lights red when an object is within
the sensor area and lights green when no object
is detected. When the status LED blinks red, a live
cable is very probably within the sensor area.
If an object is present below the sensor it is shown
in the sensor area of the display. Depending on
the size and depth of the object detected, the ob-
ject category may also be shown. The approximate
depth to the upper edge of the object detected is
shown in the status line or can be read from the
scale at the side of the display.
6.2.1 Locating objects
1.
A single scan of the area is sufficient for initial
location of an object.
2.
If no object is found, repeat the scan at right angles
to the direction of the original scan (see section. 6.1
"Using the tool").
3.
If you wish to locate an object exactly and mark
its position, simply move the tool in the reverse
direction back across the area already scanned.
4.
If an object appears in the display immediately below
the center line, as shown in illustration A, the position
of the object can be marked on the surface at the
upper marking notch.
NOTE However, this mark will be accurate only
when the object runs exactly perpendicular to the
direction of scan as the sensor area lies slightly
below the marking notch.
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