User manual

Triggers
R&S
®
RTO
86User Manual 1316.0827.02 ─ 06
"Normal"
The instrument acquires a waveform only if a trigger occurs, that is, if
all trigger conditions are fulfilled. If no trigger occurs, no waveform is
acquired and the last acquired waveform is displayed. If no waveform
was captured before, none is displayed.
When no trigger has been found for longer than one second, a message
box appears that shows the time elapsed since the last trigger.
"Free Run"
The instrument starts acquisition immediately and triggers after a very
short time interval independet 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.
SCPI command:
TRIGger<m>:MODE on page 490
Acquisition/average count
Access:
●
TRIGGER > "Control" tab > "Average count (N-single count)"
●
ACQUISITION > "Average count"
●
HORIZONTAL > "Ultra Segmentation" tab > disable "Acquire maximum" > "Required"
●
MATH > "Setup" tab > "Average count"
The acquisition and average count has several effects:
● It sets the number of waveforms acquired with RUN N×SINGLE.
●
It defines the number of waveforms used to calculate the average waveform.
Thus, the instrument acquires sufficient waveforms to calculate the correct average
if "Average" is enabled for waveform arithmetic. The higher the value is, the better
the noise is reduced.
●
It sets the number of acquisitions to be acquired in an Ultra Segmentation acquisition
series. Thus, you can acquire exactly one Ultra Segmentation acquisition series with
RUN N×SINGLE.
If Ultra Segmentation is enabled and configured to acquire the maximum number of
acquisitions, the acquisition count is set to that maximum number and cannot be
changed. See also: "Number of acquisitions" on page 37.
●
It is the "Finished" criteria for the state of a mask test.
SCPI command:
ACQuire:COUNt on page 435
Force Trigger
If the acquisition is running in normal mode and no valid trigger occurs, forcing the trigger
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.
SCPI command:
TRIGger<m>:FORCe on page 490
Reference for Triggers