TECHNICAL DESCRIPTION AND OPERATING MANUAL ST131 <PIRANHA II> and ST131N
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4.2.5 Operation in the “WIRE 0.01–30 MHz” channel.
In this range checking for presence of high-frequency signal in lines is done.
In general the sequence of modes used corresponds to the "RADIO 30-4400 MHz" channel.
Additionally, provided the access to the option "OSCILLOSCOPE" in the FULL RANGE mode that
allows, for example, quickly assess the presence of impulsive components in the received signal
composition.
Separately considered:
mains 380/220V in total with sockets
local computer network (ETHERNET)
Power lines 380/220 in total with sockets
Frequency range of listening devices, which are using 220V mains for data transfer is usually
concentrated on low frequency range – from 40 to 200 kHz.
Devices, which are using noise like signals and impulse modulation can be located on any area
of frequency range. For detecting such kind of signals with impulse modulation «OSCILLOSCOPE» option
should be used.
One of the most possible places of listening devices location are inner cavity of network sockets.
ST131 should be connected to all sockets in room due to the fact that power supply of the room
(respectively data transfer from the room) can be done from different phases.
Check extension cords or mains powered devices in the presence of built listening devices
produced by their serial connection to the power supply and measurement level of signal. In this case
it is rational to use «RANGE SUBTRACTION» option. It will allow to see all previously missing signals.
Local computer network (ETHERNET)
Data transfer, depending on used protocol, is done by pairs shown on the fig 51.
Same way, as with telephone line analysis presence of signals in unused pairs control should be
done.
4.2.6 WORKING IN 30-3000MHz RANGE
In this range inspection of wirelines on presence of high frequency signals, particularly in
coaxial lines (TV broadcast cables).
Connection is done directly to the inspected cable or through BNC adapter.