Benchmark 1010-501 Manual page 4

AC WIRE WARNING
The AC WARNING detection feature works continuously in Stud 1/2 in., Stud
1 in. Stud 1 1 / 2 in scan, and Metal Scan modes. When live AC voltage is
detected, the AC detection warning indicator will appear on the display. If
scanning begins over a live AC Wire, the AC Wire Warning will show
continuously. Use extreme caution under these circumstances or whenever
live AC wiring is present.
WARNING
Electrical field locators may not detect live AC wires if wires are more than 2
in. (51 mm) from the scanned surface, in concrete, encased in conduit,
present behind a plywood shear wall or metallic wall covering, or if moisture is
present in the environment or scanned surface.
SCANNING IN METAL MODE
Note: When scanning for studs, use Stud 1/2 in. scan mode (or Stud 1 in.,
Stud 11/2 in. scan mode on thicker walls) to quickly locate the center and
edges. Use Metal Scan to determine if the previous reading in Stud scan was
a wood stud, metal stud, or pipe. In Metal Scan, only metal drywall screws will
be found in wood studs, while metal will be indicated everywhere on a metal
stud or pipe.
Metal Scan has interactive calibration to adjust to its sensitivity to metal,
which can be used to find the precise location of metal objects in walls, floors,
and ceilings. Maximum sensitivity is ideal for quickly finding the approximate
location of metal. However, sensitivity can be reduced by calibrating the tool
closer to metal. With reduced sensitivity, the area where metal is indicated will
be smaller. But in both cases, the metal target is in the center of the area
where the tool indicates metal is present.
1. Press mode switch button to Metal Scan mode. For maximum metal
sensitivity, turn the tool on in the air by pressing and holding the Scan button.
This will ensure that it calibrates away from any metal objects.
2. (Figure A) While holding the Scan button, press the tool flat against the wall
and slowly slide the scanner across the surface. Mark the point where you get
the highest metal indication (the most Middle bars on the screen). If it is a
strong target, the top indicated arrow will show, and a steady beep will sound.
Continue in the same direction until display bars reduce. Reverse direction and
mark the spot where the display bars peak from the reversed direction. The
midpoint of the two marks is the location of the center of the metal object.
If the unit indicates metal over a large area, you can refine the scanning area to
more accurately locate the metal target by following steps 3 and 4 below.
3. (Figure B) To further pinpoint the location of the metal target, scan the area
again. Release the Scan button and then turn the unit back on, this time starting
on the wall over one of the previous marks. This will reset the tool to a lower
sensitivity and narrow the scan area.
4. (Figure C) To continue to reduce sensitivity and further refine the scanning
area, repeat step 3. This procedure can be repeated multiple times to narrow
the field even further.
Figure A
Figure C
Figure B