Advent Instruments AI-5120, Руководство пользователя

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The top portion of the window displays the current line status and signal level. Both AC
RMS level and DC line voltage are shown. AC signal frequency is displayed if sufficient
signal level is present. Options exist to apply various signal filters (adjustable low pass,
high pass, band pass, and notch) in order to minimize unwanted or interfering tones.
The bottom half of the window shows the recorded events on a time line, along with the
summary information of the events detected. In the example above, the time line is
viewing a 4 second span showing a Caller ID message transmission. Both the time span
and time position is adjustable by clicking on the appropriate buttons. The selected event
in the example above is the detection of a Caller ID FSK message. The basic type of
message is shown along with time intervals to prior and following events.
While the window above shows the basic or summary information regarding the events
detected, further analysis and information is provided by the Data Recorder window. In
the following figure, portions of the captured waveforms for the Caller ID transmission
are displayed.
The AI-5120 records waveforms using two different channels. The first channel is DC
coupled and provides a maximum range of +/- 300 volts. It is used for recording events
such as ringing, on-hook, off-hook, line flash, and pulse dialing. The second channel is
AC coupled with a range of 10 volts peak-to-peak. Sampling much faster than the DC
coupled channel, it records the DTMF, FSK, and CAS/DTAS events.
The figure above shows both channels during the example Caller ID transmission. The
top half (DC coupled) of the window shows the ringing signal prior to the FSK message,
while the bottom half (AC coupled) shows the FSK message. By clicking on the
appropriate buttons, the vertical span, horizontal span, and position of the waveforms can
be changed.
In addition to displaying the captured waveform, the TRsSim software can present
various reports showing more detailed information. This includes measurements for any
DTMF digits, FSK message bytes, Caller ID parameter contents, and SMS message
AI-5120 User Guide 7