Kurth KE301 - Page 26

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SOLIDorALTkeybriey(<2s)togglesbetweenthetwomodesandthisis
displayed through the LEDs to the right of the respective key. If the SOLID
or ALT key is pressed for longer than 2 s, the search frequency is toggled.
TherespectiveclearLEDlightsupbrieytoconrmthekeystrokeandthe
selection.With the ET720/ET800,a short conrmation beepandthen the
selected frequency is also audible. To select the next frequency, release the
key, and press it again for longer than 2 s. In SOLID mode it is possible to
switch between 1 kHz, 1.9 kHz and 577.5 Hz.
In SOLID more, the frequencies can be switched between 1 kHz, 1,9 kHz,
and 577,5 Hz .In ALT mode, the frequency combinations 880 Hz,1 kHz,
1.9kHz,2.6kHz,and577.5pulsescanbeselected.Thedi󰀨erentfrequen-
cies can be used to distinguish the search devices.
Ideally, the cables/lines/wires are voltage-free. However, the search signal can
be fed into active (live but max. 90 V) telecommunication and data cables and
lines without interference. ET400/ET720/ET800 are high-impedance for data
signals, and thus it is possible to send search signals onto active telephone
lines with ISDN and ADSL systems without data interference. The ET400
sends, contrary to the other ET, a sinusoidal signal instead of a square wave
andalsohasanadditionalltersothatinterferenceisreducedevenfurther.
Searching cables and lines
To search for cables – also under plaster – and lines, the ET is connected to
earth (e.g. protective conductor, water line) with the black test lead and to a
single wire or a pair of wires with the red test lead. When searching for shield-
ed cables/lines, the red test lead is connected to the shield and the black one
to earth. If there is no shield, two wires (no pair!) are connected to the cable/
line.Ifthescreenisearthed,itmustbedisconnectedonbothsides.Tond
and trace a coax cable, the other end must be open. If this is connected to a
distributor, it cannot be found due to the shielding of the coax cable.
In the case of telecommunication or data cables/lines
with twisted wires, these must not be connected together.
Switch on the device. The selected tone is transmitted. Now select the search
frequency.
If there is a short-circuit, the sound is sent into the cable in a similar way to
interrupted twin wires and all wires are charged with it but only up to a max-
imum of 200 meters.
The cable/line is searched for with the Probe and can be followed contactless
with the Probe from a distance of up to 60 cm away from the cable.