Bosch Truvo Original Instructions Manual page 22

22 | English
results can be influenced by ambient conditions or the nature of the wall,
there may be a hazard even though no audio signal is emitted and the in-
dicator light (3) lights up green.
Searching for Metal Objects
When approaching a metal object, the indicator light (3) first lights up yel-
low, then changes to red and an audio signal is emitted. The pitch of the au-
dio signal increases as the metal object is approached. If the metal object is
below the centre of the sensor range (6), the pitch will be at its highest.
Even when the indicator light is yellow, there may be a metal object
u
below the sensor range. Small or deep-lying metal objects are near the
sensor, or the nature of the wall affects the measuring result.
Searching for Live Cables
The measuring tool displays single-phase live cables (110−240 V,
50−60 Hz). Other cables (multi-phase electricity cables, DC, higher/lower
frequency or voltage) as well as non-live cables cannot be reliably detected,
but they may be displayed as metal objects.
Preparing to take measurements and features of the measuring process:
– The cable must be live. You should therefore connect electricity con-
sumers (e.g. lights, appliances) to the electricity cable you are trying to
find. Switch on the electricity consumers to ensure that the electricity
cable is live.
– The 50–60 Hz signal from the electricity cable must be able to reach
the measuring tool. If the cable is in damp walls (e.g. due to high humid-
ity), behind metallic foils (e.g. from thermal insulation) or in an empty
metal pipe, the signal will not reach the measuring tool and you will not be
able to find the cable.
If the indicator light (3) lights up yellow or red over a larger range, then
the material is electrically shielded and the search for live cables is not re-
liable.
– The measuring tool must be sufficiently earthed. To do this, hold it
firmly (without gloves) by the gripping surface (1). Make sure that you
are in good contact with the floor. Insulating shoes, ladders or platforms
may compromise your contact with the floor. The floor must also be
earthed in order for live cables to be detected.
– The 50–60 Hz signal from the electricity cable must be stronger
along the cable than in its immediate vicinity. If the wall is very dry or
1 609 92A 6H5 | (30.06.2021) Bosch Power Tools