User manual

Triggers
R&S
®
RTO
54User Manual 1316.0827.02 ─ 06
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Trigger type and its setup
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Qualification
Trigger sequence
A complex trigger sequence joins two separate events with a delay time and a reset time
or reset event. This combination is called "A → B → R" trigger sequence. Similar setups
are also known as multi-step trigger or A/B trigger.
The combination of one event with holdoff conditions defines a simple "A only" sequence.
Trigger information
Information on the most important trigger settings are shown in the trigger label on top of
the signal bar. If you double-tap the trigger label, the "Trigger" dialog box opens. The
label shows:
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Trigger mode and trigger sequence
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Trigger type, edge/polarity and trigger source for A- and B-event
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Trigger offset
When no trigger has been found for longer than one second, a message box appears
that shows the current state of the trigger. For long time bases, the state indicates the
remaining pretrigger time (time to the reference point), the waiting time if no trigger
occurs, and after the trigger the time until the acquisition is completed. While waiting for
the trigger, the "Force trigger" button is available to get a waveform quickly. You can also
drag the message box to the signal bar.
External trigger input, analog and digital trigger system
In R&S RTO, the trigger types use either an analog or a digitized signal as the trigger
signal.
If the trigger source is a channel input, the trigger types use a digitized signal. The trigger
system of the instrument is a separate system, thus the signal processing by enhance-
ment, decimation and arithmetic has no impact on the trigger signal. Most of the
R&S RTO trigger types use the digitized trigger signal.
If the trigger source is the EXT TRIGGER INPUT on the rear panel, only the analog edge
trigger is available that use directly the analog input signal. For this analog trigger signal,
qualification and the "A → B → R" sequence are not available.
Basics of Triggering