icListen AF User Guide
© December, 2017
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5.3
Epoch Mode
In Epoch mode,
icListen
can be configured to detect specific signals in the real-time spectrum data, and
perform a number of tasks based on those signals.
icListen
can check the data for 5 independent
triggers, each with a unique trigger signal and unique actions based on that signal.
Figure 5-3: Epoch Triggers
When setting up epoch triggers, both the trigger signal (event) and effect of detection can be
configured.
The trigger signal is defined by a frequency range to check, the type of test to perform (signal power
above or below a configured threshold), and the minimum duration the signal must be present.
The effect can be any combination of the following actions:
•
Log waveform data
•
Log spectrum data
•
Transmit a message over the epoch channel
Logging events will be recorded for a configurable pre-event duration before the event signal was
present, during the event, and for a configurable post-event duration after the signal has gone away.
See the above figure for more detail.
Epoch messages will be sent when an event trigger signal has been verified (end of “Trigger” seen in the
above figure). Detection of the next trigger event will not begin until the post-event duration has
elapsed (and therefore no new messages will be sent for this trigger during this time). All streamed
epoch messages are also logged internally on the instrument.
