Rohde & Schwarz SMU200A - Trigger Signals

Instrument Function
R&S
®
SMU200A
336Operating Manual 1007.9845.32 ─ 15
Fig. 5-33: Signal behavior when power ramping is enabled. The Burst Gate signal defines the start of
the rising and falling edges of the envelope, and the Lev Att signal defines the start and
end of level attenuation. The level attenuation value is defined in the Power Ramp Control
menu.
5.8.2.7 Trigger Signals
In the R&S Signal Generator, trigger signals are internally generated or externally sup-
plied signals which start signal generation at a particular point in time.
Signal generation can also take place without triggering, in which case the signal is then
generated in full after modulation is powered up. A trigger event either has no effect on
signal generation (menu setting "Trigger Mode Auto") or triggers a signal restart (menu
setting "Trigger Mode Retrigger").
If signal generation is triggered, the signal is continuously generated after the first trigger.
In the "Armed_Auto" mode, a further trigger event has no effect. In the "Armed_Retrig"
mode, every additional trigger event triggers a restart of the signal. In both cases, trig-
gering can be reset to the initial state ("armed"), i.e. signal generation is stopped and the
instrument waits for the next trigger to start signal generation anew.
The status of signal generation ("Running" or "Stopped") is displayed for all trigger modes
in the corresponding trigger menu of the digital standard currently switched on. The signal
generation status particularly with an external trigger can thus be checked.
Internal and external trigger sources are available for triggering.
●
Internally, triggering is carried out manually by pressing the "Execute Trigger" button
(menu selection "Internal").
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In the case of two-path instruments, internal triggering can be caused by the trigger
signal on the second path (menu selection "Internal (Baseband A/B)"). This makes it
possible to synchronize the signal on one of the two paths with the signal on the
second path. Using an external trigger source, it is possible to set the trigger signal
to be delayed or suppressed.
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External trigger signals can be fed in via the TRIGGER connector (menu selection
"External").
In the case of external triggering and internal triggering by the trigger signal on the
second path, the start can be delayed by a definable number of symbols (menu setting
"Trigger Delay External"). This makes it possible to purposely simulate the time delay
between a base station signal and a user equipment signal, for example in the course
of base station tests.
The effect of a restarted trigger signal in the "Retrigger" trigger mode can be sup-
pressed for a definable number of symbols (menu setting "External Trigger Inhibit").
By this means the trigger can be suppressed for a definable number of frames, for
Baseband Signal - Baseband Block