22
| English
1 609 929 X41 | (28.10.10)
Bosch Power Tools
Scanning for “Live” Wires
The measuring tool indicates lines that carry a voltage between
110 V and 400 V with frequencies corresponding to the wide-
spread standard (AC with 50 or 60 Hz). Other lines (DC, higher/
lower frequency or voltage) are indicated only as metal objects.
“Live” wires/conductors are indicated both during a metal scan
as well as during a wood scan. When a “live” wire/conductor is
detected, the indicator
a
appears in the display. Move the meas-
uring tool over the surface repeatedly in order to localise the
“live” wire/conductor more precisely. After moving the measur-
ing tool over the surface several times, the “live” wire/conductor
can be indicated quite precisely. If the measuring tool is very
close to the wire/conductor (four or five bars in indicator
a
), the
illuminated ring
1
flashes red and the signal tone sounds with a
rapid tone sequence.
“Live” wires/conductors can be detected easier when power
consumers (e.g., lamps, appliances) are connected to the wire/
conductor being sought and switched on. Wires/conductors
with 110 V, 230 V and 400 V (three-phase current) are detected
with about the same scan capacity.
Under certain conditions (such as when behind metal surfaces
or behind surfaces with high water content), “live” wires/con-
ductors cannot be detected with certainty. These ranges can
be recognised in the metal detection function. When a measur-
ing value is indicated all over a larger range of the measuring
indicator
f
, then the material is screening off electrically and
the scan for “live” wires/conductors is not reliable.
Wires that are not “live” can be found as metal objects with the
detecting-metal function. However, stranded cables are not in-
dicated (contrary to solid copper conductors).
Working Advice
f
Measuring values can be impaired through certain ambi-
ent conditions. These include, e.g., the proximity of other
equipment that produce strong magnetic or electromag-
netic fields, moisture, metallic building materials, foil-lam-
inated insulation materials or conductive wallpaper or
tiles.
Therefore, please also observe other information
sources (e.g. construction plans) before drilling, sawing or
routing into walls, ceilings or floors.
Switching Off the Signal Tone
The signal tone can be switched on and off. For this, press the
metal-detection button
6
and the wood-detection button
5
at
the same time. When the signal tone is switched off, the
switched-off audio signal indicator
j
appears on the display.
The signal tone setting is maintained after switching the meas-
uring tool off and on again.
OBJ_BUCH-139-002.book Page 22 Thursday, October 28, 2010 9:38 AM
