Manual

29
identify ports on routers/switches/hubs) (ET400/ET720/ET800 only)
Inaddition,youcanndandtestberopticcables(FO)(ET800only)
Warning:
Where technically possible, work must be carried out in
the absence of voltage!
Do not work at > 90 V DC!
In case of electrical cables/lines as part of a electrical
installation/system work must always be carried out
free of voltage!
ET: The devices must be switches on before it is con-
nected to cable/lines. Otherwise dangerous error states
will not be detected immediately!
1. TONE Mode – Search via Tone Signal
Information on the Search Tone
The ET has six search frequencies and two sound modes (ALT/SOLID). After
switching on in TONE mode, the ET starts in ALTerning mode. Pressing the
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