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Detection of toner signals
The KE420 xDSL Probe detects active toner signals from the KE890/895.
The emitted continuous or alternating tones are made audible acoustically
via an integrated speaker or connected headphones.
Cable tracking
For cable tracking – also under plaster – the KE890/895 is connected to
ground with the black test cord and to a single wire, a pair of wires or, in the
case of shielded cables, to the shield exposed on both sides with the red
test cord, and the desired search frequency is selected. The selected tone is
transmitted and can be detected non-contacting with the KE420 at a distance
of up to 30 cm from the cable. The maximum search depth depends strongly
on the material and condition of the object between the cable and the KE420
search signal receiver.
The maximum possible transmission range of the search signal with unloa-
ded lines is up to 15 km, depending on the type of line and its condition. If
there is a short circuit, the range of the search signal is reduced to a maxi-
mum of 200 meters.
The cable is searched with the KE420. It is switched on by pressing and hol-
ding the
LOW
or
HIGH
key. In order to find a signal from a greater distance or
a weak signal, the cable is first searched with
HIGH
. With large cable bundles
at the distributor or in a platform, the xDSL Probe is moved over the bundle
while the
HIGH
button is pressed.
Once the cables with the strongest signal have been determined, the
LOW
key is pressed to precisely identify the cable being searched for. The highest
signal level is always above the cable.
When searching for shielded cables, the red test cable is connected to the
shield and the black cable to earth (e.g. protective conductor, water line). If
there is no shield, two wires (no pair!) are connected in the cable. If the shield
is earthed, it must be disconnected on both sides.
In the case of telecommunication or data cables with twisted wires, these
must not be connected together.
