ST 500 "Piranha" Operation Manual: Use Guidelines
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If "THREAT" signals were not detected, check the changes in the differential spectrum when
the consumers are connected.
It is required to receive a differential panorama of the powered line, and then in turn connect
consumers. Thus, it is possible to establish which consumer is the source of the "THREAT" signal.
19. Exit the AUTOMATED mode ("ESC"); the current differential spectrum on the powered
circuit with no consumer connections will be shown.
20. Exit the DIFFERENTIAL mode ("F3"); the current differential spectrum on the powered
circuit with no consumer connections will be shown.
21. Turn on the DIFFERENTIAL mode ("F3"); the differential spectrum on the powered circuit
will be shown, with all the previously detected signals set as "0".
22. Connect one of the consumer devices to the circuit. If new signals are detected in the
"PANORAMA" mode, turn on the AUTOMATED mode ("F2") and analyze each of them as described
earlier in this manual.
Upon analyzing all the signals, exit the AUTOMATED mode ("ESC"), turn off DIFFERENTIAL
mode ("F3") and then turn it back on to obtain a new differential spectrum.
Connect the next consumer device to the circuit and analyze the new signals, following the
above procedure.
The analysis is complete when the circuit has been tested with all the consumer devices
connected consecutively. The consumer devices whose connection lead to the appearance of
"THREAT" signals in the differential spectrum, must be dissembled and checked for non-standard
components.
9.3.2. LOW CURRENT CIRCUIT TESTING
In contrast to power two-core cabling, low current cabling is, as a rule, multi-core, and the
operator must test all the possible paired combinations of wires.
A testing procedure for an office PBX line is described below.
The initial state:
Office PBX is connected to the telephone line. The telephone is connected to the line through a
telephone socket (the telephone receiver is "hung up"). The telephone line is powered from the
PBX and is operating normally.
The HF transmitter can be connected to a telephone line laid in the room, or installed in the
telephone.
Analog telephone line search algorithm:
1. Connect ST 500 to the telephone line
2. Turn on the test sound source and adjust the sound volume.
3. Connect headphones to the main unit.
4. Turn on ST 500 and activate "WIRED RECEIVER" channel.
5. Select circuit type ("Low Voltage").
6. Select one of the frequency bands.
7.
The table of combinations of pairs will be display on the screen.
8. Press "FUNC" (turn on "ELECTRONIC SWITCH SETTINGS" mode).
9. Press "F3" (turn on 6P4C connecting); the connection scheme is shown in
