Triggers
R&S
®
RTP
239User Manual 1337.9952.02 ─ 12
"Repetitive"
The instrument starts acquisition immediately and triggers after a
short time interval independent of the time base settings and faster
than in "Auto" mode. Real triggers are ignored. Use this mode if the
"Auto" mode is too slow.
Remote command:
TRIGger<m>:MODE on page 1313
Force Trigger
If the acquisition is running in normal mode and no valid trigger occurs, forcing the trig-
ger provokes an immediate single acquisition. Thus you can confirm that a signal is
available and use the waveform display to determine how to trigger on it.
If you need this function frequently, you can add the "Force Trigger" icon to the toolbar.
Remote command:
TRIGger<m>:FORCe on page 1313
Holdoff mode
Selects the method to define the holdoff condition.
The trigger holdoff defines when the next trigger after the current will be recognized.
Thus, it affects the next trigger to occur after the current one. Holdoff helps to obtain
stable triggering when the oscilloscope is triggering on undesired events.
Holdoff settings are not available if the trigger source is an external trigger input or
serial bus. For the TV trigger, only the "Events" mode is useful.
Example:
You want to analyze the first pulse in a burst of several pulses. At first, you select a
sufficiently slow time base to display the entire burst. Then, you set the holdoff time a
little longer than the length of the burst. Now, each trigger corresponds to the first pulse
in successive bursts, and you can change the time base to display the waveform in
more detail.
The following methods are available:
"Time"
Defines the holdoff directly as a time period. The next trigger occurs
only after the "Holdoff time" has passed.
"Events"
Defines the holdoff as a number of trigger events. The next trigger
only occurs when this number of events is reached. The number of
triggers to be skipped is defined in "Holdoff events".
"Random"
Defines the holdoff as a random time limited by "Minimum time" and
"Maximum time". For each acquisition cycle, the instrument selects a
new random holdoff time from the specified range.
Random holdoff prevents synchronization to discover effects invisible
with synchronized triggering, for example, the features of a pulse
train.
Mode / Holdoff
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